Precipitated iron catalysts are expected to be used in next generation slurry reactors for large-scale production of transportation fuels from synthesis gas. These reactors are expected to operate at higher temperatures and lower H{sub 2}:CO ratios relative to the Sasol Arge reactor (Table 1A). The feasibility of using iron catalysts has been demonstrated under relatively mild Arge-type conditions but not under more severe slurry conditions. Possibly, an improvement in catalytic stability will be needed to make iron catalysts suitable for slurry operation. This program was aimed at identifying the chemical principles governing the deactivation of precipitated iron catalysts during Fischer-Tropsch synthesis and use of these chemical principles in the design of more stable catalysts. A new precipitated Fe catalyst was developed in this program for slurry reactor operation. The new Fe catalyst is predicted to perform slightly below the performance targets for slurry bubble column operation. Stability targets appear to be achievable. This catalyst did not noticeably deactivate during 1,740 hours on-stream. Compared to the selectivity target, an excess of 2% C{sub 1} + C{sub 2} was formed at 265{degrees}C. Based on the initial catalyst inventory in the autoclave, the catalyst seems to be short of the activity target by …

This report documents the results of the corrosion tests that were performed to aid in the selection of the construction materials for multi-function waste tanks to be built in the U.S. Department of Energy Hanford Site. Two alloys were tested: 304L and Alloy 20 austenitic stainless steel. The test media were aqueous solutions formulated to represent the extreme of the chemical compositions of waste to be stored in the tanks. The results summerized by alloy are as follows: For 304L the tests showed no stress-corrosion cracking in any of the nine test solutions. The tests showed pitting in on of the solutions. There were no indications of any weld heat-tint corrosion, nor any sign of preferential corrosion in the welded areas. For Alloy 20 the tests showed no general, pitting, or stress-corrosion cracking. One crevice corrosion coupon cracked at the web between a hole and the edge of the coupon in one of the solutions. Mechanical tests showed some possible crack extension in the same solution. Because of the failure of both alloys to meet test acceptance criteria, the tank waste chemistry will have to be restricted or an alternative alloy tested.

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The Super Collider is a high-energy scientific instrument composed of a 53-mile-long ring of proton accelerators designed to collide protons and evaluate the emanating particles. The Oak Ridge Y-12 Plant is under contract to perform work for the Superconducting Super Collider Laboratory (SSCL) and has been asked to develop manufacturing processes for components of the gammas, electrons, muons (GEM) detector. Three welded subassemblies are involved in the fabrication of these conductors. The superconducting cable is enclosed in a stainless steel conduit, which is then enclosed in an aluminum sheath. The ends of the conductor are terminated with a connector assembly joined to the superconductor, the conduit, and the sheath. Initially, the conduit weld was to be a single-pass, autogenous gas-tungsten arc weld. The authors made a great effort to get full penetration without root reinforcement on the inside of the tube. When the authors were unable to meet all of the weld requirements with an autogenous weld, they shifted development efforts to making the weld using an automatic gas-tungsten arc tube welding head with an integral wire feeder. Because reinforcement at the root continued to be a problem, the authors decided to make the weld in two passes. To achieve …