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Rhodium Catalysts in the Oxidation of CO by O<sub>2</sub> and NO: Shape, Composition, and Hot Electron Generation
It is well known that the activity, selectivity, and deactivation behavior of heterogeneous catalysts are strongly affected by a wide variety of parameters, including but not limited to nanoparticle size, shape, composition, support, pretreatment conditions, oxidation state, and electronic state. Enormous effort has been expended in an attempt to understand the role of these factors on catalytic behavior, but much still remains to be discovered. In this work, we have focused on deepening the present understanding of the role of nanoparticle shape, nanoparticle composition, and hot electrons on heterogeneous catalysis in the oxidation of carbon monoxide by molecular oxygen and nitric oxide. These reactions were chosen because they are important for environmental applications, such as in the catalytic converter, and because there is a wide range of experimental and theoretical insight from previous single crystal work as well as experimental data on nanoparticles obtained using new state-of-the-art techniques that aid greatly in the interpretation of results on complex nanoparticle systems. In particular, the studies presented in this work involve three types of samples: ~ 6.5 nm Rh nanoparticles of different shapes, ~ 15 nm Rh<sub>1-x</sub>Pd<sub>x</sub> core-shell bimetallic polyhedra nanoparticles, and Rh ultra-thin film (~ 5 nm) catalytic nanodiodes. The colloidal …
Date:
March 8, 2010
Creator:
Renzas, James R.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Science & Technology Review April/May 2010
This month's issue has the following articles: (1) Fifty Years of Stellar Laser Research - Commentary by Edward I. Moses; (2) A Stellar Performance - By combining computational models with test shot data, scientists at the National Ignition Facility have demonstrated that the laser is spot-on for ignition; (3) Extracting More Power from the Wind - Researchers are investigating how atmospheric turbulence affects power production from wind turbines; (4) Date for a Heart Cell - Carbon-14 dating reveals that a significant number of heart muscle cells are regenerated over the course of our lives; and (5) Unique Marriage of Biology and Semiconductors - A new device featuring a layer of fat surrounding a thin silicon wire takes advantage of the communication properties of both biomolecules and semiconductors.
Date:
March 8, 2010
Creator:
Blobaum, K M
Object Type:
Report
System:
The UNT Digital Library
Sons of American Revolution - Oklahoma Society
Photograph of Wayne Nash and Martin Reynolds dated March 8, 2010. Photo is a 5" X 7" color photo.
Date:
March 8, 2010
Creator:
unknown
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Sons of American Revolution - Oklahoma Society
Photograph of Martin Andrew Reynolds and wife Rebecca Josphine dated March 8, 2010. Photo is a 5" X 7" color photo.
Date:
March 8, 2010
Creator:
unknown
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Sons of American Revolution - Oklahoma Society
Photograph of Fred Parham and unnamed man dated March 8, 2010.
Date:
March 8, 2010
Creator:
unknown
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Sons of American Revolution - Oklahoma Society
Photograph of Wayne Nash, Martin Andrew Reynolds, and Fred Parham dated March 8, 2010. Photo is a 5" X 7" color photo.
Date:
March 8, 2010
Creator:
unknown
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Sons of American Revolution - Oklahoma Society
Photograph of Wayne Nash and Fred Parham dated March 8, 2010.
Date:
March 8, 2010
Creator:
unknown
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Sweetwater Reporter (Sweetwater, Tex.), Vol. 112, No. 096, Ed. 1 Monday, March 8, 2010
Daily newspaper from Sweetwater, Texas that includes local, state, and national news along with advertising.
Date:
March 8, 2010
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The U.S. Secret Service: An Examination and Analysis of Its Evolving Missions
This report frames potential policy questions concerning the U.S. Secret Service's (USSS's) mission and organization through an examination of the USSS history and its statutory authorities, mission, and present activities within the Department of Homeland Security (DHS).
Date:
March 8, 2010
Creator:
Reese, Shawn
Object Type:
Report
System:
The UNT Digital Library
United Nations System Funding: Congressional Issues
This report tracks the process by which Congress provides the funding for U.S. assessed contributions to the regular budgets of the United Nations, its agencies, and U.N. peacekeeping operation accounts, as well as for U.S. voluntary contributions to U.N. system programs and funds. It includes information on the President's request and the congressional response, as well as congressional initiatives during this legislative process. Basic information is provided to help the reader understand this process.
Date:
March 8, 2010
Creator:
Browne, Marjorie Ann & Nakamura, Kennon H.
Object Type:
Report
System:
The UNT Digital Library
The Use of Digital Image Correlation in Explosive Experiments
None
Date:
March 8, 2010
Creator:
Gagliardi, F J & Cunningham, B J
Object Type:
Article
System:
The UNT Digital Library
Visa Security Policy: Roles of the Departments of State and Homeland Security
This report provides an overview of the roles of the department of state and homeland security on the visa security policy.
Date:
March 8, 2010
Creator:
Wasem, Ruth Ellen
Object Type:
Report
System:
The UNT Digital Library
Visa Security Policy: Roles of the Departments of State and Homeland Security
This report discusses the visa security and visa policy questions debated in Congress. The policy questions center on whether immigration law needs to be strengthened, whether funding should be increased, and which agency should take the lead.
Date:
March 8, 2010
Creator:
Wasem, Ruth Ellen
Object Type:
Report
System:
The UNT Digital Library