21 Matching Results

Search Results

Advanced search parameters have been applied.
in subjects: "Catalysts"  
Results: 1 - 21
open access

Low temperature, sulfur tolerant homogeneous catalysts for the water-gas shift reaction

Description: The purpose of this report is to update and reorganize our recent review on homogeneous catalysis of the water-gas shift reaction (WGSR) based on recent literature publications and patents. This updated version will serve as a means of selecting 10 candidate catalyst systems for use in developing effective, sulfur-tolerant, low temperature WGSR catalysts. This report discusses the variations possible in the basic chemistry associated with WGSR catalytic cycles, including basic, acidic, and neut… more
Date: January 20, 1986
Creator: Laine, R. M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Superacid Catalyzed Coal Conversion Chemistry. Final Technical Report, September 1, 1983-September 1, 1986

Description: This research project involved the study of a raw comparatively mild coal conversion process. The goal of the project was to study model systems to understand the basic chemistry involved and to provide a possible effective pretreatment of coal which significantly improves liquefaction-depolymerization under mild conditions. The conversion process operates at relatively low temperatues (170/sup 0/C) and pressures and uses an easily recyclable, stable superacid catalysts (HF-BF/sub 3/). It conse… more
Date: January 1, 1986
Creator: Olah, G.A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Platinum loss and migration in porous gas diffusion fuel cell electrodes as studied by Rutherford backscattering

Description: Long-term operation of phosphoric acid fuel cell produces severe migration of the highly dispersed electrocatalyst, Pt, from the cathode to the anode. We have examined, before and after extended operation, the porous gas diffusion electrode assemblies by conventional Rutherford backscattering spectrometry using the ion beam facility at Los Alamos. In addition, we have made computer simulations to the data that give catalyst concentration as a function of depth. The data demonstrate that after e… more
Date: January 1, 1986
Creator: Borodovsky, L.; Beery, J.G. & Paffett, M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

The mobile phase in coals: Its nature and modes of release: Final report: Part 1, Structural inferences from dry catalytic hydrogenation of a subbituminous coal

Description: In a study to provide insight into the two component structural model of coal and the mechanisms of coal liquefaction, an approach was adopted in which a subbituminous coal was reacted with hydrogen in the presence of an impregnated molybdenum sulphide catalyst and in the absence of solvent. Reactions were conducted at temperatures between 300 and 400/sup 0/C and for reaction times up to 180 min. The composition and yields of gaseous products, chloroform-soluble liquids and insoluble residues w… more
Date: December 1, 1986
Creator: Terrer, M. T. & Derbyshire, F. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Summary and assessment of METC zinc ferrite hot coal gas desulfurization test program, final report: Volume 1

Description: The Morgantown Energy Technology Center (METC) has conducted a test program to develop a zinc ferrite-based high temperature desulfurization process which could be applied to fuel gas entering downstream components such as molten carbonate fuel cells or gas turbines. As a result of prior METC work with iron oxide and zinc oxide sorbents, zinc ferrite evolved as a candidate with the potential for high capacity, low equilibrium levels of H/sub 2/S, and structural stability after multiple regenera… more
Date: December 1, 1986
Creator: Underkoffler, V.S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Structure and activity of Pt-Co alloys as oxygen reduction electrocatalysts

Description: Carbon supported Pt-Co (3:1 atom ratio) catalysts were prepared in both acid and alkaline aqueous media, followed by heat treatments to promote alloy formation. Both preparations began with a commercial 10% Pt on carbon catalyst with Pt particle sizes of 15 to 30 A. Significantly greater alloying was observed in the acid media prepared catalyst. X-ray diffraction studies of the acid prepared catalyst demonstrated lattice parameters tending away from Pt (3.937 A) and toward that for Pt/sub 3/Co … more
Date: March 1, 1986
Creator: Beard, B. C. & Ross, P. N., Jr.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Pyrolyzed macrocycle/carbon blends for advanced electrocatalysts

Description: Pyrolysis of metallated macrocycle compounds involves a vapor phase condensation to form a solid, condensation product that is carbonaceous and electronically conductive. Reaction of these vapors with hot carbon surfaces permits condensation on these surfaces that prepares active electrocatalytic carbons. The role of the metal ion in these processes is not clear, although the chelate clearly acts to carry the metal into the vapor phase. Rapid peroxide decomposition results only with the composi… more
Date: January 1, 1986
Creator: Vanderborgh, N.E. & Rieke, P.C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Micelle-derived catalysts for extended Schulz-Flory

Description: The objective of this program is to develop a synthesis gas conversion catalyst with higher selectivity to liquid fuels, while maintaining catalytic activity and stability at least equivalent relative to state-of-the-art precipitated iron catalysts. Hydrocarbon cutoff hypothesis and developmental needs for a ruthenium catalyst with low light ends selectivity were investigated during this quarter. Hydrocarbon product distribution was Anderson-Schulz-Flory up to a carbon number of 250 and cutoff … more
Date: January 1, 1986
Creator: Abrevaya, H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Micelle-derived catalysts for extended Schulz-Flory

Description: The objective of this program is to develop a synthesis gas conversion catalyst with higher selectivity to liquid fuels, while maintaining catalytic activity and stability at least equivalent relative to state-of-the-art precipitated iron catalysts. During this quarter, the emphasis in the program has been the investigation of the hydrocarbon cutoff hypothesis with supported ruthenium catalysts. An alumina-supported catalyst with smaller than 20[Angstrom] ruthenium particles was tested under co… more
Date: January 1, 1986
Creator: Abrevaya, H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Micelle-derived catalysts for extended Schulz-Flory

Description: The objective of this program is to develop a synthesis gas conversion catalyst selective to gasoline or diesel range fuel via application of a micelle technique for preparing specific site supported ruthenium particles. The current emphasis is to investigate hydrocarbon cutoff principle and to apply it for developing selective catalysts. During this quarter, micelle technique was further improved and 1 ruthenium particle:l reverse micelle limit was approached by careful control of catalyst syn… more
Date: January 1, 1986
Creator: Abrevaya, H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Low temperature, sulfur tolerant homogeneous catalysts for the water-gas shift reaction. Task 1, Topical report No. 1

Description: The purpose of this report is to update and reorganize our recent review on homogeneous catalysis of the water-gas shift reaction (WGSR) based on recent literature publications and patents. This updated version will serve as a means of selecting 10 candidate catalyst systems for use in developing effective, sulfur-tolerant, low temperature WGSR catalysts. This report discusses the variations possible in the basic chemistry associated with WGSR catalytic cycles, including basic, acidic, and neut… more
Date: January 20, 1986
Creator: Laine, R. M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Low temperature, sulfur tolerant homogeneous catalysts for the water-gas shift reaction. Task 2, Test plan

Description: The objective of this project is to identify, prepare, test, characterize, and evaluate a practical, homogeneous catalyst for a water-gas shift process. The project effort is divided into the following five tasks: (1) Update SRI`s recent review of the literature on the catalysis of the water-gas shift reaction (WGSR) to include references after 1982 and those in the patent literature. Based on this review, SRI will choose ten candidate systems to be evaluated as to their abilities to catalyze t… more
Date: April 1, 1986
Creator: Laine, R. M.; Wood, B. J. & Krishnan, G. N.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Micelle-derived catalysts for extended Schulz-Flory. Technical progress report, July 1, 1986--September 30, 1986

Description: The objective of this program is to develop a synthesis gas conversion catalyst with higher selectivity to liquid fuels, while maintaining catalytic activity and stability at least equivalent relative to state-of-the-art precipitated iron catalysts. During this quarter, the emphasis in the program has been the investigation of the hydrocarbon cutoff hypothesis with supported ruthenium catalysts. An alumina-supported catalyst with smaller than 20{Angstrom} ruthenium particles was tested under co… more
Date: December 31, 1986
Creator: Abrevaya, H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Micelle-derived catalysts for extended Schulz-Flory. [Quarterly report], January 1, 1986--March 31, 1986

Description: The objective of this program is to develop a synthesis gas conversion catalyst selective to gasoline or diesel range fuel via application of a micelle technique for preparing specific site supported ruthenium particles. The current emphasis is to investigate hydrocarbon cutoff principle and to apply it for developing selective catalysts. During this quarter, micelle technique was further improved and 1 ruthenium particle:l reverse micelle limit was approached by careful control of catalyst syn… more
Date: December 31, 1986
Creator: Abrevaya, H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Micelle-derived catalysts for extended Schulz-Flory

Description: The objective of this program is to develop a synthesis gas conversion catalyst with improved selectivity to gasoline or diesel range fuel via application of a micelle technique for preparing novel supported catalysts with specific size ruthenium particles. The major emphasis is to investigate hydrocarbon cutoff principle and to apply it for developing selective catalysts. We previously reported that cutoff is not effected with 40--60 [Angstrom] and 20--40 [Angstrom] ruthenium particles on [gam… more
Date: January 1, 1986
Creator: Abrevaya, H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Separation of gas mixtures by supported complexes

Description: A system was investigated that catalyzes the dehydrogenation of alcohols and the hydrogenation of ketones. Such a catalyst, if used in a membrane containing an alcohol solvent, might be of use in selective H/sub 2/ separation from gas mixtures. The dehydrogenation of cyclohexanol and 2-octanol were studied using a RhCl/sub 3//SnCl/sub 2//LiCl catalyst system. These alcohols are dehydrogenated at rates that are initially rapid, but which gradually slow to a stop. The decrease in rate of H/sub 2/… more
Date: December 1, 1986
Creator: Nelson, D. A. & Lilga, M. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Low temperature, sulfur tolerant homogeneous catalysts for the water-gas shift reaction

Description: The objective of this project is to identify, prepare, test, characterize, and evaluate a practical, homogeneous catalyst for a water-gas shift process. The project effort is divided into the following five tasks: (1) Update SRI's recent review of the literature on the catalysis of the water-gas shift reaction (WGSR) to include references after 1982 and those in the patent literature. Based on this review, SRI will choose ten candidate systems to be evaluated as to their abilities to catalyze t… more
Date: April 1, 1986
Creator: Laine, R. M.; Wood, B. J. & Krishnan, G. N.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Energy and economic savings from improved catalysts: Executive summary

Description: The energy, economic costs and benefits of applying the materials-by-design concept to catalysts were estimated. Catalysts are of particular interest because of the competitive challenge from Japan, West Germany, and France. Initial estimates developed in this study reveal a potential capital cost savings of $31 billion and an operating cost savings of $69 billion for chemical and petroleum refining plants over a 15-year period. The findings of this study substantiate the claim that a major US … more
Date: November 1, 1986
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Micelle-derived catalysts for extended Schulz-Flory. Technical progress report, October 1, 1986--December 31, 1986

Description: The objective of this program is to develop a synthesis gas conversion catalyst with higher selectivity to liquid fuels, while maintaining catalytic activity and stability at least equivalent relative to state-of-the-art precipitated iron catalysts. Hydrocarbon cutoff hypothesis and developmental needs for a ruthenium catalyst with low light ends selectivity were investigated during this quarter. Hydrocarbon product distribution was Anderson-Schulz-Flory up to a carbon number of 250 and cutoff … more
Date: December 31, 1986
Creator: Abrevaya, H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Micelle-derived catalysts for extended Schulz-Flory. [Quarterly report], April 1, 1986--June 30, 1986

Description: The objective of this program is to develop a synthesis gas conversion catalyst with improved selectivity to gasoline or diesel range fuel via application of a micelle technique for preparing novel supported catalysts with specific size ruthenium particles. The major emphasis is to investigate hydrocarbon cutoff principle and to apply it for developing selective catalysts. We previously reported that cutoff is not effected with 40--60 {Angstrom} and 20--40 {Angstrom} ruthenium particles on {gam… more
Date: December 31, 1986
Creator: Abrevaya, H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Adaptive dynamic networks as models for the immune system and autocatalytic sets

Description: A general class of network models is described that can be used to present complex adaptive systems. These models have two purposes: On a practical level they are closely based on real biological phenomena, and are intended to model detailed aspects of them. On a more general level, however, they provide a framework to address broader questions concerning evolution, pattern recognition, and other properties of living systems. This paper concentrates on the more general level, illustrating the b… more
Date: April 1, 1986
Creator: Farmer, J. Doyne; Kauffman, Stuart A.; Packard, Norman H. & Perelson, Alan S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
Back to Top of Screen