Download or read book Investigation of Dispersed Iron Alloy Catalysts in the Carbon Monoxide hydrogen Synthesis Reaction Progress Report August 1 1980 July 31 1981 written by and published by . This book was released on 1981 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The past year has seen completion of two major tasks in the research program: (1) a detailed study of the characterization of particle size in supported .cap alpha.-Fe2O3 and related characterizations of the reduced metal with silica gel support; (2) a reaction study of a series of silica supported Fe-Ni, Fe-Co, Fe-Cu, Fe-K and the corresponding pure metals. Synthesis activity and selectivity were particular objectives of this work, and a particular correlation of the conversion dependence of selectivity and water-gas shift activity was observed. We feel this to be an important finding: the catalysts which are good water-gas shift catalysts are the ones which are inhibited during the synthesis. A mechanism of product inhibition by water formation has been proposed to explain the conversion dependence of selectivity.

Download or read book Investigation of Dispersed Iron Alloy Catalysts in the Carbon Monoxide hydrogen Synthesis Reaction Progress Report August 1 1979 July 31 1980 written by and published by . This book was released on 1980 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A series of Fe-Ni, Fe-Co, Fe-Cu and Fe-K catalysts supported on SiO/sub 2/ have been prepared, characterized, and investigated with respect to activity and selectivity in CO-H/sub 2/ synthesis. In addition, several silica supported iron nitrides have been prepared and characterized. During the period encompassed by this report, our catalyst characterization activities have been directed toward the identification of the particle sizes and phases formed upon preparation, calcination, reduction and carburization. We have employed a combination of methods in doing these characterizations: transmission electron microscopy, x-ray diffraction, Moessbauer spectroscopy and temperature programmed oxidation-reduction. Study of the activity and selectivity of the catalyst series has been carried out in a differential reactor system in the range of 225 to 300/sup 0/C with 3H:CO stoichiometry. We have also been developing a hydrogen uptake procedure for determining exposed surface in supported iron catalysts. It has been found that the conditions of preparation strongly affect the nature of the resulting catalyst, both with respect to alloy homogeneity, metal particle size, and catalytic activity. For the Fe system in particular, standard methods of preparation via impregnation and calcination result in very large particle (ca. 80 nm) composites of smaller individual grains (ca. 10 nm). characterization via x-ray or Moessbauer, however, reveals only the characteristic dimension of the granules and not of the composite particles.

Download or read book Energy Research Abstracts written by and published by . This book was released on 1983 with total page 756 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Investigation of Dispersed Iron Alloy Catalysts in the Carbon monoxide hydrogen Synthesis Reaction Progress Report August 1 1978 July 31 1979 written by and published by . This book was released on 1979 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Research on the characterization of the oxidation-reduction and carburization behavior of the Fe-Ni system using Fe/SiO/sub 2/, 4Fe-Ni/SiO/sub 2/, and Ni/SiO/sub 2/ catalysts is reported. (FS).

Download or read book Fossil Energy Update written by and published by . This book was released on 1981 with total page 886 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Government Reports Announcements Index written by and published by . This book was released on 1983-07 with total page 1116 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Government Reports Annual Index written by and published by . This book was released on 1981 with total page 1192 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sections 1-2. Keyword Index.--Section 3. Personal author index.--Section 4. Corporate author index.-- Section 5. Contract/grant number index, NTIS order/report number index 1-E.--Section 6. NTIS order/report number index F-Z.

Download or read book Government Reports Annual Index Keyword A L written by and published by . This book was released on 1985 with total page 976 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Energy Research Abstracts written by and published by . This book was released on 1983 with total page 756 pages. Available in PDF, EPUB and Kindle. Book excerpt: Includes all works deriving from DOE, other related government-sponsored information and foreign nonnuclear information.

Download or read book Effects of Dispersion and Support on Adsorption Catalytic and Electronic Properties of Cobalt alumina Co Hydrogenation Catalysts Final Progress Report August 1 1987 July 31 1990 written by and published by . This book was released on 1990 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: An investigation of the effects of surface structure, dispersion, and support on the adsorption, catalytic, and electronic properties of cobalt/alumina is described, the objectives of which were to determine (1) the effects of surface structure and metal dispersion on the adsorption and catalytic properties of cobalt and (2) the effects of direct electronic interactions between metal clusters and support, on the adsorption, catalytic and electronic properties of cobalt supported on alumina. Effects of surface structure and dispersion on the adsorption, activity/selectivity, and electronic properties of Co/W single crystal surfaces and alumina-supported cobalt were investigated in a surface investigation, lab reactor studies, TPD/TPSR studies, and a Moessbauer spectroscopy study. The structure, stability, surface electronic properties, and chemisorptive properties of vapor-deposited cobalt overlayers (0-4 ML) on W(110) and W(100) were studied by Auger electron spectroscopy, low energy electron diffraction, work function changes, and temperature programmed desorption (TPD) of cobalt, hydrogen, and carbon monoxide. The CO chemisorptive properties of the two cobalt overlayers are quite different, CO adsorption being dissociative on the W(100) surface and nondissociative on the W(110) surface; comparison of the results with those for Ni/W(100) indicate that Co/W(100) dissociates CO as a result of electronic interaction with the tungsten substrate.

Download or read book Studies of Supported Metal Catalysts Progress Report September 1 1980 August 31 1981 written by and published by . This book was released on 1981 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: During this period research has been carried out on five separate catalyst systems. The effect of zinc ions on the interaction between cobalt and .gamma.-Al/sub 2/O/sub 3/ has been studied. Work on the oxidic Mo/Al/sub 2/O/sub 3/ system has been published and studies have been extended to the sulfided catalysts. The first phase of work on the Co/Mo/Al/sub 2/O/sub 3/ system has been completed. Work on W/Al/sub 2/O/sub 3/ catalysts has begun and the oxidic system has been studied in some detail. Work continues on metal-support interactions in supported nickel catalysts. An electron spectroscopy (ESCA) study has been completed and work is continuing on correlation of the ESCA results with measurements like temperature programmed desorption (TPD) and temperature programmed reduction (TPRd).

Download or read book Support Dispersion Effects in Supported Iron Catalysts written by Makarand D. Phadke and published by . This book was released on 1984 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Catalytic Enrichment of Industrial Gases by the Synthesis of Methane written by Great Britain. Fuel Research Board and published by . This book was released on 1953 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Technology Development for Iron Fischer Tropsch Catalysts Technical Progress Report No 8 July 1 1992 September 30 1992 written by and published by . This book was released on 1992 with total page 61 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objectives of this contract are to develop a technology for the production of active and stable iron Fischer-Tropsch catalysts for use in slurry-phase synthesis reactors and to develop a scaleup procedure for large-scale synthesis of such catalysts for process development and long-term testing in slurry bubble-column reactors. With a feed containing hydrogen and carbon monoxide in the molar ratio of 0.5 to 1.0 to the slurry bubble-column reactor, the catalyst performance target is 88% CO + H2 conversion at a minimum space velocity of 2.4 NL/hr/gFe. The desired sum of methane and ethane selectivities is no more than 4%, and the conversion loss per week is not to exceed 1%. Contract Tasks are as follows: 1.0--Catalyst development, 1.1--Technology assessment, 1.2--Precipitated catalyst preparation method development, 1.3--Novel catalyst preparation methods investigation, 1.4--Catalyst pretreatment, 1.5--Catalyst characterization, 2.0--Catalyst testing, 3.0--Catalyst aging studies, and 4.0--Preliminary design and cost estimate of a catalyst synthesis facility. This paper reports progress made on Task 1.

Download or read book Highly Dispersed Catalysts for Coal Liquefaction Quarterly Report No 5 August 23 1992 November 22 1992 written by and published by . This book was released on 1992 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objectives of this project are to study the effect of pretreatment methods on the two-stage liquefaction process. In particular, the effects of dispersed catalysts and carbon monoxide atmospheres on a coal liquefaction process. The project is divided into three technical tasks. Task 1 and 2 deal with the analyses and liquefaction experiments, respectively, whereas Task 3 deals with the economic impact of utilizing the pretreatment methods. This quarter we concentrated on Tasks 1 and 2, which are summarized. In this support task, the fractionated products from the coal liquefaction experiments conducted in Task 2 were analyzed for C, H, and N content. A very low H/C ratio for these products was found, and is most likely due to the low H/C ratio of the Black Thunder recycle solvent used in these liquefaction experiments. Also, during this quarter an on-line gas chromatograph was integrated into the autoclave system. We also conducted some experiments to determine the ease of activation of potential coal liquefaction catalysts. For these experiments the technique of NO chemisorption was used to determine the active catalytic MoS2 sites on coals impregnated with organometallic Mo precursors. We found that these organometallic Mo clusters easily activated to MoS2 sites. We continued our base-line screening experiments in the 300 mL autoclaves. Last quarter iron oxide and iron carbonyl catalysts were compared using an atmosphere of hydrogen with 3% H2S. This quarter we included a comparison of liquefaction with iron oxide where we added an additional atmosphere of 20% carbon monoxide and found that this addition increased the conversion yields to soluble products. All of the carbon monoxide was accounted for as either unconverted carbon monoxide or as carbon dioxide. No evidence of conversion of the carbon monoxide to methane or Fischer-Tropsch type reactions were observed.

Download or read book Investigation of Sulfur tolerant Catalysts for Selective Synthesis of Hydrocarbon Liquids from Coal derived Gases Quarterly Technical Progress Report September 19 December 18 1980 written by and published by . This book was released on 1981 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A 15% iron boride on SiO2 catalyst was prepared using an alcohol solution reduction with NaBH4. H2 chemisorption measurements were performed for Fe-S-100 (3% Fe/SlO2) and are in progress for the iron-boride-silica catalyst. Reduction of Co catalysts at 623 K rather than 723 K is being tested as a method to improve dispersion by decreasing the amount of Co-support interaction. An in depth study of non olefinic and nonparaffinic compound retention times on the 10% SP2100 chromotograph column has shown that the compounds elute in the following order for a specific carbon number: alkene

Download or read book Technology Development for Iron Fischer Tropsch Catalysis Quarterly Technical Progress Report No 4 July 1 1995 September 30 1995 written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The affect of copper promotion on the activity and selectivity of hydrogen pretreated, precipitated iron Fischer-Tropsch catalysts was studied. Fischer-Tropsch synthesis was carried out in the slurry phase in one in one liter continuous stirred tank reactors at a space velocity of 3.lNL h[sup[minus]1] g[sup[minus]1](Fe), H[sub 2]:CO= 0.7 at either 270[degree]C or 230[degree]C. Catalysts with atomic compositions relative to iron of 10OFe/4.4Si/l. OK and 10OFe/4.4Si/2.6Cu/l. OK were used at 270[degree]C and catalysts with the compositions of 100Fe/4.4Si/4.2K and 10OFe/4.4Si/2.6Cu/4.2K were used at 230[degree]C. XRD and Moessbauer spectroscopy both show that the 10OFe/4.4Si/2.6Cu/l. OK catalyst contained approximately 24%[alpha]-Fe with the remainder Fe[sub 3]O[sub 4] after a 24 h pretreatment with hydrogen at 220[degree]C. Copper promotion was found to substantially increase the activity and productivity of the catalysts. Catalysts promoted with copper reached maximum activity within 100 h of synthesis while catalysts with no copper went through an induction period. The activity of the hydrogen pretreated 10OFe/4.4Si/2.6Cu/1.0K catalyst operated at 270[degree]C was comparable to the activity of the 100Fe/4.4Si/l. OK catalyst after pretreatment with carbon monoxide or syngas at one atmosphere pressure. However, the activity of the hydrogen pretreated 1O0Fe/4.4Si/2.6Cu/4.2K catalyst at 230[degree]C was found to be substantially lower than the same catalyst pretreated with carbon monoxide or syngas at one atmosphere pressure.