Imaging Fourier Transform Spectrometer (open access)

Imaging Fourier Transform Spectrometer

The operating principles of an Imaging Fourier Transform Spectrometer (IFTS) are discussed. The advantages and disadvantages of such instruments with respect to alternative imaging spectrometers are discussed. The primary advantages of the IFTS are the capacity to acquire more than an order of magnitude more spectral channels than alternative systems with more than an order of magnitude greater etendue than for alternative systems. The primary disadvantage of IFTS, or FTS in general, is the sensitivity to temporal fluctuations, either random or periodic. Data from the IRIFTS (ir IFTS) prototype instrument, sensitive in the infrared, are presented having a spectral sensitivity of 0.01 absorbance units, a spectral resolution of 6 cm{sup {minus}1} over the range 0 to 7899 cm{sup {minus}1}, and a spatial resolution of 2.5 mr.
Date: April 14, 1993
Creator: Bennett, C. L.; Carter, M. R.; Fields, D. J. & Hernandez, J.
Object Type: Article
System: The UNT Digital Library
Computer assisted accelerator tuning (open access)

Computer assisted accelerator tuning

The challenge of tuning an induction accelerator in real time has been addressed with the new TUNE GUIDE code. The code initializes a beam at a particular position using a tracer particle representation of the phase space. The particles are transported, using a matrix formulation, element by element along the beamline assuming that the field of a solenoid, or steering element is constant over its length. The other allowed elements are gaps and drift sections. A great deal of effort has been spent programming TUNE GUIDE to operate under the IBMPC Windows 3.1 system. This system features an intuitive, menu driven interface, which provides an ability to rapidly change beamline component parameter values. Consequently various accelerator setups can be explored and new values determined in real time while the accelerator is operating. In addition the code has the capability of varying a capability value over a range and then plotting the resulting beam properties, such as radius or centroid position, at a down stream position. Element parameter editing is also included along with an on-line hyper text oriented help package.
Date: April 14, 1993
Creator: Boyd, J. K.
Object Type: Article
System: The UNT Digital Library
Application of probabilistic risk assessment methods to incinerator design and permitting (open access)

Application of probabilistic risk assessment methods to incinerator design and permitting

The Consolidated Incineration Facility at the Savannah River Site is designed without emergency flue gas vents. The main components of this 18 million btu/hr facility are a rotary kiln and secondary combustion chamber, each with a code allowable internal pressure of 15 psig. The facility is designed to treat mixed waste. During the early stages of design it was judged on a qualitative basis that potential eventsthat might produce damaging overpressures were not credible. When these findings were questioned during subsequent design reviews, a probabilistic risk assessment was undertaken to provide a quantitative basis for decision making. The result was identification of design conditions leading to relatively high frequencies for a few event sequences in which the allowable pressure might be exceeded. Risk assessment assumptions and results were reviewed with design engineers and relatively simple improvements were identified that collectively reduced the frequency of overpressure to an acceptable level. This experience showed that the use of formalized risk assessment techniques can provide valuable insight leading to timely and cost-effective improvements in facility design and operating procedures. In this case, the program of analysis and follow-on improvements provided justification for incinerator operation without thermal relief devices.
Date: February 14, 1993
Creator: Brown, E. A.; McAfee, D. E. & Aabye, D. C.
Object Type: Article
System: The UNT Digital Library
Application of probabilistic risk assessment methods to incinerator design and permitting (open access)

Application of probabilistic risk assessment methods to incinerator design and permitting

The Consolidated Incineration Facility at the Savannah River Site is designed without emergency flue gas vents. The main components of this 18 million btu/hr facility are a rotary kiln and secondary combustion chamber, each with a code allowable internal pressure of 15 psig. The facility is designed to treat mixed waste. During the early stages of design it was judged on a qualitative basis that potential eventsthat might produce damaging overpressures were not credible. When these findings were questioned during subsequent design reviews, a probabilistic risk assessment was undertaken to provide a quantitative basis for decision making. The result was identification of design conditions leading to relatively high frequencies for a few event sequences in which the allowable pressure might be exceeded. Risk assessment assumptions and results were reviewed with design engineers and relatively simple improvements were identified that collectively reduced the frequency of overpressure to an acceptable level. This experience showed that the use of formalized risk assessment techniques can provide valuable insight leading to timely and cost-effective improvements in facility design and operating procedures. In this case, the program of analysis and follow-on improvements provided justification for incinerator operation without thermal relief devices.
Date: February 14, 1993
Creator: Brown, E.A.; McAfee, D.E. (Westinghouse Savannah River Co., Aiken, SC (United States)) & Aabye, D.C. (Science Applications International Corp., Oak Ridge, TN (United States))
Object Type: Article
System: The UNT Digital Library
Hydrogen peroxide safety issues (open access)

Hydrogen peroxide safety issues

A literature survey was conducted to review the safety issues involved in handling hydrogen peroxide solutions. Most of the information found in the literature is not directly applicable to conditions at the Rocky Flats Plant, but one report describes experimental work conducted previously at Rocky Flats to determine decomposition reaction-rate constants for hydrogen peroxide solutions. Data from this report were used to calculate decomposition half-life times for hydrogen peroxide in solutions containing several decomposition catalysts. The information developed from this survey indicates that hydrogen peroxide will undergo both homogeneous and heterogeneous decomposition. The rate of decomposition is affected by temperature and the presence of catalytic agents. Decomposition of hydrogen peroxide is catalyzed by alkalies, strong acids, platinum group and transition metals, and dissolved salts of transition metals. Depending upon conditions, the consequence of a hydrogen peroxide decomposition can range from slow evolution of oxygen gas to a vapor, phase detonation of hydrogen peroxide vapors.
Date: April 14, 1993
Creator: Conner, W. V.
Object Type: Report
System: The UNT Digital Library
Ecosystems, Biomes, and Watersheds: Definitions and Use (open access)

Ecosystems, Biomes, and Watersheds: Definitions and Use

This paper describes the meaning and applications of ecosystem and of the related terms watershed and biome. It discusses the pros and cons of all three as organizing principles for land management, and the major issues that are likely to arise in the debate over ecosystem management.
Date: July 14, 1993
Creator: Corn, M. Lynne
Object Type: Report
System: The UNT Digital Library
Laboratory testing of ozone oxidation of Hanford Site waste from Tank 241-SY-101 (open access)

Laboratory testing of ozone oxidation of Hanford Site waste from Tank 241-SY-101

Ozone was investigated as a reagent to oxidize and destroy organic species present in simulated and genuine waste from Hanford Site Tank 241-SY-101 (Tank 101-SY). Two high-shear mixing apparatus were tested to perform the gas-to-solution mass transfer necessary to achieve efficient use of the ozone reagent. Oxidations of nitrite (to form nitrate) and organic species were observed. The organics oxidized to form carbonate and oxalate as well as nitrate and nitrogen gas from nitrogen associated with the organic. oxidations of metal species also were observed directly or inferred by solubilities. The chemical reaction stoichiometries were consistent with reduction of one oxygen atom per ozone molecule. Acetate, oxalate, and formate were found to comprise about 40% of the genuine waste`s total organic carbon (TOC) concentration. Ozonation was found to be chemically feasible for destroying organic species (except oxalate) present in the wastes in Tank 101-SY. The simulated waste formulation used in these studies credibly modelled the ozonation behavior of the genuine waste.
Date: December 14, 1993
Creator: Delegard, C. H.; Stubbs, A. M. & Bolling, S. D.
Object Type: Report
System: The UNT Digital Library
Anisotropy and spatial variation of relative permeability and lithologic character of Tensleep Sandstone reservoirs in the Bighorn and Wind River basins, Wyoming. First quarterly technical progress report, September 15, 1993--December 14, 1993 (open access)

Anisotropy and spatial variation of relative permeability and lithologic character of Tensleep Sandstone reservoirs in the Bighorn and Wind River basins, Wyoming. First quarterly technical progress report, September 15, 1993--December 14, 1993

This multidisciplinary study is designed to provide improvements in advanced reservoir characterization techniques. This goal is to be accomplished through: (1) an examination of the spatial variation and anisotropy of relative permeability in the Tensleep Sandstone reservoirs of Wyoming; (2) the placement of that variation and anisotropy into paleogeographic, depositional, and diagenetic frameworks; (3) the development of pore-system imagery techniques for the calculation of relative permeability; and (4) reservoir simulations testing the impact of relative permeability anisotropy and spatial variation on Tensleep Sandstone reservoir enhanced oil recovery. Concurrent efforts are aimed at understanding the spatial and dynamic alteration in sandstone reservoirs that is caused by rock-fluid interaction during CO{sub 2} enhanced oil recovery processes. The work focuses on quantifying the interrelationship of fluid-rock interaction with lithologic characterization in terms of changes in relative permeability, wettability, and pore structure, and with fluid characterization in terms of changes in chemical composition and fluid properties. This work will establish new criteria for the susceptibility of Tensleep Sandstone reservoirs to formation alteration that results in a change in relative permeability and wellbore scale damage. This task will be accomplished by flow experiments using core material; examination of regional trends in water chemistry; examination of …
Date: December 14, 1993
Creator: Dunn, T. L.
Object Type: Report
System: The UNT Digital Library
Six-mm, plane-wave shock driver (open access)

Six-mm, plane-wave shock driver

A 6-mm-diameter, plane-wave shock generation system has been developed and characterized as a laboratory bench driver for small scale experiments. The driver is based on an exploding-foil-driven slapper used either directly or to initiate an HE pellet. The slapper is driven by a low-inductance fireset with burst currents on the order of 30 kA and burst times of about 250ns, with a time-to-burst jitter under 10ns. Both the slapper impact and the detonation breakout of the pellet have been measured to be flat to within 10ns over a 6-mm diameter. Fabry-Perot velocimetry of impacts with LiF crystals were used to characterize shock pressures and durations. Attenuator plates and flyers driven by the HE were also measured, which provided a variety of available pulse shapes and data for modeling efforts.
Date: June 14, 1993
Creator: Frank, A. M. & Chau, H. H.
Object Type: Article
System: The UNT Digital Library
Customizable VLSI Artificial Neural Network Chips Based on a Novel Technology (open access)

Customizable VLSI Artificial Neural Network Chips Based on a Novel Technology

The human cerebral cortex contains approximately 10{sup 11} neurons and 10{sup 14} synapses. It thus seems logical that any technology intended to mimic human capabilities should have the ability to fabricate a very large number of neurons and even larger numbers of synapses. This paper describes an implementation of hardware neural networks using highly linear thin-film resistor technology and an 8-bit binary weight circuit to produce customizable artificial neural network chips and systems.
Date: September 14, 1993
Creator: Fu, Chi Yung; Law, Benjamin; Chapline, George & Swenson, Dick
Object Type: Article
System: The UNT Digital Library
A novel process monitoring and control system based on a neural manufacturing concept (open access)

A novel process monitoring and control system based on a neural manufacturing concept

This paper describes our work to produce ``smart`` equipment using a neural network to provide intelligence for process monitoring, adaptive control, metrology, and equipment diagnostics. This novel system will improve both quality and yield for critical thin films used in semiconductors, superconductors, high-density magnetic and optical storage, and advanced displays, all of which are critical to maintaining our leadership in the multibillion-dollar electronic and computer industries. The equipment will have on-line, real-time diagnostics capabilities to detect component problems early in order to minimize maintenance and downtime.
Date: September 14, 1993
Creator: Fu, Chi Yung; Petrich, L. & Law, B.
Object Type: Article
System: The UNT Digital Library
LLNL on-line surplus chemical exchange data base (open access)

LLNL on-line surplus chemical exchange data base

Lawrence Livermore National Laboratory (LLNL) is a US Department of Energy (DOE)` research and development (R&D) facility operated by the University of California. The R&D activities conducted at LLNL require the use of a wide variety of chemicals which are purchased in sufficient quantities to ensure that the necessary supply is on-hand to meet programmatic schedules and commitments. Purchasing control measures minimize excess inventories of unused chemicals, but small quantities of opened and unopened surplus chemicals still remain at the conclusion of research activities. Drum quantities of surplus chemicals also can be generated if a programmatic activity is abruptly terminated because of loss of funding. A real-time system was needed to route unused surplus chemicals to new experiments and programs instead of to waste treatment and disposal facilities. Representatives from four LLNL organizations (Lasers, Defense Systems/Nuclear Design, Chemistry, and Business Services) combined their skills and ideas to develop and implement an on-Ii ne surplus chemical exchange system for use at LLNL. An electronic surplus chemical bulletin board, referred to. as the ``LLNL Chemical Exchange Data Base,`` is the product of the group`s efforts.
Date: April 14, 1993
Creator: Gonzalez, M. A.
Object Type: Article
System: The UNT Digital Library
Development and application of photosensitive device systems to studies of biological and organic materials. Progress report, January 1, 1993--December 31, 1993 (open access)

Development and application of photosensitive device systems to studies of biological and organic materials. Progress report, January 1, 1993--December 31, 1993

This progress report summarizes results, as of August, 1993, for DOE grant DE-FG-02-76ER60522 during the fiscal period 1/1/93 to 12/31/93, which is the first year of a 3-year grant cycle. The overall goals of the grant are to develop advanced x-ray detector technologies, especially as applicable for biological and materials research at the national laboratories, and to train graduate and post-doctoral students on the use of these technologies via the performance of original biological and materials research. As summarized below, there has been good progress toward achieving the research goals of the original 3-year proposal; in consequence, the research plan and the total budget for the rest of 1993 and beyond is still well described by the original proposal. Accomplishments since the last progress report include: (A) A 1k x 1k fiber optically coupled CCD detector was assembled, tested at CHESS and is slated for extended user trials this Fall. A 2k x 2k CCD detector is being assembled for permanent installation at CHESS. (B) X-ray detector phosphors, calibration techniques, and system software have been developed. (C) The design of a Pixel Array Detector, a collaborative project with the Advanced Photon Source, has been initiated. (D) The properties of biomembrane …
Date: September 14, 1993
Creator: Gruner, S. M. & Reynolds, G. T.
Object Type: Report
System: The UNT Digital Library
Optimum extracted H{sup {minus}} and D{sup {minus}} current densities from gas-pressure-limited high-power hydrogen/deuterium tandem ion sources (open access)

Optimum extracted H{sup {minus}} and D{sup {minus}} current densities from gas-pressure-limited high-power hydrogen/deuterium tandem ion sources

The tandem hydrogen/deuterium ion source is modelled for the purpose of identifying the maximum current densities that can be extracted subject to the gas-pressure constraints proposed for contemporary beam-line systems. Optimum useful extracted current densities are found to be in the range of approximately 7 to 10 mA cm{sup {minus}2}. The sensitivity of these current densities is examined subject to uncertainties in the underlying atomic/molecular rate processes; A principal uncertainty remains the quantification of the molecular vibrational distribution following H{sub 3{sup +}} wall collisions.
Date: July 14, 1993
Creator: Hiskes, J. R.
Object Type: Article
System: The UNT Digital Library
Survey of odd-odd deformed nuclear spectroscopy (open access)

Survey of odd-odd deformed nuclear spectroscopy

In this paper, we survey the current experimental data that support assignment of rotational bands in odd-odd deformed nuclear in the rare earth and actinide regions. We present the results of a new study of {sup 170}Mt nuclear structure. In a comparing experimental and calculated Gallagher-Moszkowski matrix elements for rare earth-region nuclei, we have developed a new approach to the systematics of these matrix elements.
Date: September 14, 1993
Creator: Hoff, R. W.
Object Type: Report
System: The UNT Digital Library
Estimation of Ni{sup 63}, Pu{sup 241}, Pu{sup 242} and Am{sup 243} from Co{sup 60}, Pu{sup 239}, and Cm{sup 244} activities in groundwater samples (open access)

Estimation of Ni{sup 63}, Pu{sup 241}, Pu{sup 242} and Am{sup 243} from Co{sup 60}, Pu{sup 239}, and Cm{sup 244} activities in groundwater samples

The Part B Permit for F&H Seepage Basins calls for analysis of several constituents of concern in groundwater monitoring wells. Four of these analytes are the radionuclides Ni{sup 63}, Pu{sup 241}, Pu{sup 242}, and Am{sup 243}. These are currently not being analyzed due to their very difficult, tedious analytical schemes coupled with their relatively low activity values. This report demonstrates how the activity value for Ni{sup 63}, a week beta emitter, can be estimated from that of Co{sup 60}, an easily detectable, high-energy gamma emitter. Similarly, estimates of Pu{sup 241}, a beta emitter, and the alpha-emitting Pu{sup 242} can be made from the activity value of the more easily detected Pu{sup 239}. Am{sup 243} can be estimated from the activity of Cm{sup 244}, which is easier to detect because of a shorter half-life (higher specific activity) and the emission of higher energy alpha particles. These correlations are made under very specific parameters in order to ensure the validity of this approach. Therefore, assumptions must be established setting ground rules for establishing these activity relationships. Bases for these assumptions are explained and/or referenced. Their degree of uncertainty limits the accuracy of the data so that the term ``estimate`` is used. Such …
Date: May 14, 1993
Creator: Holcomb, H. P.
Object Type: Report
System: The UNT Digital Library
Use of bioassays in assessing health hazards from complex mixtures: A RASH analysis (open access)

Use of bioassays in assessing health hazards from complex mixtures: A RASH analysis

The Finney harmonic mean model for joint toxicity of ingredients in mixtures can be used to estimate the toxicity of the neat compound if one component can be substituted in potency-adjusted-doses for each of the other components. Chemical analysis data and relative potency values (computed according to the Rapid Screening of Hazard (RASH) method) were used to compare the toxicities as predicted from ingredients of cigarette smoke, PAHs in diesel exhaust, asphalt, coal tar, pitch, and creosote with the measured toxicities of the neat mixtures. Accuracy for cigarette smoke condensate, coal tar, pitch, and creosote were within a factor of three; asphalt within a factor of 18; but the PAC content of diesel particulate was inadequate to accurately describe the toxicity of diesel emissions.
Date: October 14, 1993
Creator: Jones, T. D.
Object Type: Article
System: The UNT Digital Library
Influence of meteorology in assessing energy externalities: application of the damage function approach (open access)

Influence of meteorology in assessing energy externalities: application of the damage function approach

This paper describes a methodology for estimating energy externalities. These externalities are environmental, health, and other damages and benefits that traditionally have not been considered as part of the cost of producing and consuming goods and services. An example of externalities is the effect on human health from exposure to ozone formed by NO{sub x} and other emissions from electric power plants. These damages are valued adversely by individuals (and by society) but are not reflected in the price of electricity. The damage function approach is a methodology which is used for developing quantitative estimates of externalities. This paper describes the five major steps in the damage function approach, focuses on the use of ozone models in that framework, and points out the effects of meteorological variables on estimates of ozone concentrations.
Date: September 14, 1993
Creator: Lee, R.; Miller, R. L. & McIlvaine, C. M.
Object Type: Article
System: The UNT Digital Library
Validation of criticality safety calculational methods for U-AVLIS plant project (open access)

Validation of criticality safety calculational methods for U-AVLIS plant project

The objectives of the Uranium Atomic Vapor Laser isotope Separation (U-AVLIS) are to develop, demonstrate, and deploy a laser-based process to enrich natural uranium in the U-235 isotope to levels useful as fuel in commercial light-water power reactors. Current U-AVLIS production plant criteria call for uranium product enriched in {sup 235}U up to 5 wt%. Development of the U-AVLIS technology is in an advanced stage, and demonstration of the integrated enrichment process is currently in progress using plant-scale equipment in the Uranium Demonstration System (UDS) at Lawrence Livermore National Laboratory. In this paper several existing experimental data which are applicable to the critical systems of importance to the safe design of the U-AVLIS plant are identified. These were used to benchmark a configuration-controlled, work station based version of one state-of-the-art computer code employed by the U-AVLIS program in UDS equipment design, and in U-AVLIS plant conceptual design NCS analyses.
Date: July 14, 1993
Creator: Lewis, K. D.
Object Type: Article
System: The UNT Digital Library
Progress toward international agreement to improve reactor safety (open access)

Progress toward international agreement to improve reactor safety

Representatives of nearly one-half of the 114 member states of the International Atomic Energy Agency (IAEA), including the United States, have participated in the development of an international nuclear safety conventions proposed multilateral treaty to improve civil nuclear power reactor safety. A preliminary draft of the convention has been developed (referred to as the draft convention for this report), but discussions are continuing, and when the final convention text will be completed and presented to IAEA member states for signature is uncertain. This report responds to the former and current Chairman`s request that we provide information on the development of the nuclear safety convention, including a discussion of (1) the draft convention`s scope and objectives, (2) how the convention will be implemented and monitored, (3) the views of selected country representatives on what provisions should be included in the draft convention, and (4) the convention`s potential benefits and limitations.
Date: May 14, 1993
Creator: Lieberman, J. I. & Graham, B.
Object Type: Report
System: The UNT Digital Library
The Status of Glueballs (open access)

The Status of Glueballs

The Status of Glueballs is presented considering that most popular candidates from among the isoscalars in the J{sup PC} = 0{sup ++}, 0{sup {minus}+} and 2{sup ++} channels. It is shown that in the 0{sup ++} channel the f{sub 0}(1720) which was discovered earlier (the S*{prime}(1720)) at BNL is highly likely the same state as the SLAC {theta}(1720) now that its spin has been found to be 0 instead of the 2 claimed for a long period. In the {sup ++} channel there is likely a complex of 2-3 states {zeta}/{eta}(1280), {lambda}/{eta}(1420) and {iota}/{eta}(1520) involving at least one extra isosclar. In the 2{sup ++}, the g{sub T}(2010), g{sub T}{prime}(2300) and g{sub T}{double_prime}(2340) {phi}{phi} states found in {pi}{sup {minus}} p {yields} {phi}{phi}n (OZI forbidden glueball filter channel) strikingly, approximately, completely break the OZI suppression and comprise within the errors all the {phi}{phi} cross-section. The only viable explanation of these states in the context of QCD is that they are produced by 1-3 primary 2{sup ++} glueballs. All alternate explanations in the past 15 years have failed.
Date: April 14, 1993
Creator: Lindenbaum, S. J.
Object Type: Article
System: The UNT Digital Library
Advanced fusion diagnostics. Final technical report, July 15, 1991--July 14, 1993 (open access)

Advanced fusion diagnostics. Final technical report, July 15, 1991--July 14, 1993

Key among various issues of ignited plasmas is understanding the physics of energy transfer between thermal plasma particles and magnetically confined, highly energetic charged ions in a tokamak device. The superthermal particles are products of fusion reactions. The efficiency of energy transfer by collisions, from charged fusion products (e.g., {alpha}-particles) to plasma ions, grossly determines whether or not plasma conditions are self-sustaining without recourse to auxiliary heating. Furthermore, should energy transfer (efficiency be poor, and substantial auxiliary heating power is required to maintain reacting conditions within the plasma, economics may preclude commercial viability of fusion reactors. The required charged fusion product information is contained in the energy distribution function of these particles. Knowledge of temporal variations of the superthermal particle energy distribution function could be used by a fusion reactor control system to balance plasma conditions between thermal runaway and a modicum of fusion product energy transfer. Therefore, diagnostics providing data on the dynamical transfer of alpha-particle and other charged fusion product energy to the plasma ions are essential elements for a fusion reactor control system to insure that proper plasma conditions are maintained. The objective of this work is to assess if spectral analysis of rf radiation emitted by …
Date: July 14, 1993
Creator: Moses, K. G.
Object Type: Report
System: The UNT Digital Library
Critical comments on the US Environmental Protection Agency Standards 40 CFR 191 (open access)

Critical comments on the US Environmental Protection Agency Standards 40 CFR 191

This paper is about the US Environmental Protection Agency (EPA) ``Environmental Standards for the Disposal of Spent Nuclear Fuel, High-Level and Transuranic Wastes,`` 40 CFR 191. These standards regulate the disposal of radioactive wastes in geologic repositories. Currently, two repository sites are under investigation: The Waste Isolation Pilot Plant (WIPP) site, located near Carlsbad, New Mexico, may become the repository for defense-generated transuranic waste (TRU); and the Yucca Mountain site, located near Las Vegas, Nevada, may become the repository for spent reactor fuel and a small amount of reprocessing waste (hereinafter called high-level radioactive waste or HLW). The paper was written for readers who have an interest in 40 CFR 191 but do not have the time or inclination to ponder the technical details.
Date: January 14, 1993
Creator: Pflum, C. G.; Van Konynenburg, R. A. & Krishna, P.
Object Type: Report
System: The UNT Digital Library
Novel approaches to the production of higher alcohols from synthesis gas (open access)

Novel approaches to the production of higher alcohols from synthesis gas

A detailed technical plan for research on higher-alcohol synthesis in a slurry reactor was prepared and approved internally, as part of the University's requirements for the doctoral degree. The focus of this plan is the high-pressure methanol synthesis catalyst, and modifications thereof. A major challenge of the research will be to identify a slurry medium that is stable at the typical operating temperature ofthis catalyst, i.e., about 400[degrees]C. Two shakedown runs were made in the stirred autoclave without catalyst in order to check the mechanical operation of the system and to test some of the analytical equipment. Further preparation, characterization and screening of higher-oxygenate synthesis catalysts based on rhodium were carried out. The catalyst compositions tested during the period were: Rh/Al[sub 2]O[sub 3], Rh/Nb/Al[sub 2]O[sub 3], Mo/Rh/Al[sub 2]O[sub 3] and W/Rh/Al[sub 2]O[sub 3]. All catalysts contained a nominal 1 wt. % Rh. Rh/Nb/Al[sub 2]O[sub 3] and Rh/Mo/Al[sub 2]O[sub 3] were about twice as active for COconversion as the other catalysts. However, oxygenate yields were disappointing for all of the compositions tested. The Rh/Mo/Al[sub 2]O[sub 3] catalyst had the highest carbon efficiency to oxygenates, 33%.
Date: April 14, 1993
Creator: Roberts, G. & Kow, S.
Object Type: Report
System: The UNT Digital Library