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Catalyst Dispersion And Activity Under Conditions Of Temperature Staged Liquefaction Technical Progress Report July September 1991
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Book Synopsis Catalyst Dispersion and Activity Under Conditions of Temperature- Staged Liquefaction. Technical Progress Report, July--September 1991 by :
Download or read book Catalyst Dispersion and Activity Under Conditions of Temperature- Staged Liquefaction. Technical Progress Report, July--September 1991 written by and published by . This book was released on 1992 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: The general objectives of this research are (1) to investigate the use of highly dispersed catalysts for the pretreatment of coal by mild hydrogenation, (2) to identify the active forms of catalysts under reaction conditions and (3) to clarify the mechanisms of catalysis. The ultimate objective is to ascertain if mild catalytic hydrogenation resulting in very limited or no coal solubilization is an advantageous pretreatment for the transformation of coal into transportable fuels. The experimental program will focus upon the development of effective methods of impregnating coal with catalysts, evaluating the conditions under which the catalysts are most active and establishing the relative impact of improved impregnation on conversion and product distributions obtained from coal hydrogenation.
Book Synopsis Catalyst Dispersion and Activity Under Conditions of Temperature-staged Liquefaction. Technical Progress Report, October--December 1991 by :
Download or read book Catalyst Dispersion and Activity Under Conditions of Temperature-staged Liquefaction. Technical Progress Report, October--December 1991 written by and published by . This book was released on 1992 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt: The general objectives of this research are (1) to investigate the use of highly dispersed catalysts for the pretreatment of coal by mild hydrogenation, (2) to identify the active forms of the catalysts under reaction conditions and (3) to clarify the mechanisms of catalysis. The ultimate objective is to ascertain if mild catalytic hydrogenation resulting in very limited or no coal solubilization is an advantageous pretreatment for the transformation of coal into transportable fuels. The experimental program will focus upon the development of effective methods of impregnating coal with catalysts, evaluating the conditions under which the catalysts are most active and establishing the relative impact of improved impregnation on conversion and product distributions obtained from coal hydrogenation.
Download or read book Energy Research Abstracts written by and published by . This book was released on 1994-04 with total page 526 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Catalyst Dispersion and Activity Under Conditions of Temperature- Staged Liquefaction. Technical Progress Report, January--March 1992 by :
Download or read book Catalyst Dispersion and Activity Under Conditions of Temperature- Staged Liquefaction. Technical Progress Report, January--March 1992 written by and published by . This book was released on 1992 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two coals, a Texas subbituminous C and a Utah high volatile A bituminous, were used to examine the effects of solvent swelling and catalyst impregnation on liquefaction conversion behavior in temperature staged reactions for 30 minutes each at 275° and 425°C in H2 and 95:5 H2:H2S atmospheres. Methanol, pyridine, tetrahydrofuran, and tetrabutylammonium hydroxide were used as swelling agents. Molybdenum-based catalyst precursors were ammonium tetrathiomolybdate, molybdenum trisulfide, molybdenum hexacarbonyl, and bis(tricarbonylcyclopentadienyl-molybdenum). Ferrous sulfate and bis(dicarbonylcyclo-pentadienyliron) served as iron-based catalyst precursors. In addition, ion exchange was used for loading iron onto the subbituminous coal. For most experiments, liquefaction in H2:H2S was superior to that in H2, regardless of the catalyst precursor. The benefit of the H2S was greater for the subbituminous, presumably because of its higher iron content relative to the hvab coal. Tetrabutylammonium hydroxide was the only swelling agent to enhance conversion of the hvab coal significantly; it also caused a remarkable increase in conversion of the subbituminous coal. The combined application of solvent swelling and catalyst impregnation also improves liquefaction, mainly through increased oil yields from the hvab coal and increased asphaltenes from the subbituminous. A remarkable effect from use of ammonium tetrathiomolybdate as a catalyst precursor is substantial increase in pristane and phytane yields. Our findings suggest that these compounds are, at least in part, bound to the coal matrix.
Book Synopsis Catalyst Dispersion and Activity Under Conditions of Temperature-staged Liquefaction by :
Download or read book Catalyst Dispersion and Activity Under Conditions of Temperature-staged Liquefaction written by and published by . This book was released on 1993 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Government Reports Announcements & Index by :
Download or read book Government Reports Announcements & Index written by and published by . This book was released on 1993 with total page 1258 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Catalyst Dispersion and Activity Under Conditions of Temperature- Staged Liquefaction by :
Download or read book Catalyst Dispersion and Activity Under Conditions of Temperature- Staged Liquefaction written by and published by . This book was released on 1992 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: The general objectives of this research are (1) to investigate the use of highly dispersed catalysts for the pretreatment of coal by mild hydrogenation, (2) to identify the active forms of catalysts under reaction conditions and (3) to clarify the mechanisms of catalysis. The ultimate objective is to ascertain if mild catalytic hydrogenation resulting in very limited or no coal solubilization is an advantageous pretreatment for the transformation of coal into transportable fuels. The experimental program will focus upon the development of effective methods of impregnating coal with catalysts, evaluating the conditions under which the catalysts are most active and establishing the relative impact of improved impregnation on conversion and product distributions obtained from coal hydrogenation.
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1992 with total page 1572 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Government Reports Annual Index by :
Download or read book Government Reports Annual Index written by and published by . This book was released on 1993 with total page 1198 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Catalyst Dispersion and Activity Under Conditions of Temperature- Staged Liquefaction. [Catalyst Precursors for Molybdenum-based Catalyst and Iron-based Catalyst]. by :
Download or read book Catalyst Dispersion and Activity Under Conditions of Temperature- Staged Liquefaction. [Catalyst Precursors for Molybdenum-based Catalyst and Iron-based Catalyst]. written by and published by . This book was released on 1992 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two coals, a Texas subbituminous C and a Utah high volatile A bituminous, were used to examine the effects of solvent swelling and catalyst impregnation on liquefaction conversion behavior in temperature staged reactions for 30 minutes each at 275° and 425°C in H2 and 95:5 H2:H2S atmospheres. Methanol, pyridine, tetrahydrofuran, and tetrabutylammonium hydroxide were used as swelling agents. Molybdenum-based catalyst precursors were ammonium tetrathiomolybdate, molybdenum trisulfide, molybdenum hexacarbonyl, and bis(tricarbonylcyclopentadienyl-molybdenum). Ferrous sulfate and bis(dicarbonylcyclo-pentadienyliron) served as iron-based catalyst precursors. In addition, ion exchange was used for loading iron onto the subbituminous coal. For most experiments, liquefaction in H2:H2S was superior to that in H2, regardless of the catalyst precursor. The benefit of the H2S was greater for the subbituminous, presumably because of its higher iron content relative to the hvab coal. Tetrabutylammonium hydroxide was the only swelling agent to enhance conversion of the hvab coal significantly; it also caused a remarkable increase in conversion of the subbituminous coal. The combined application of solvent swelling and catalyst impregnation also improves liquefaction, mainly through increased oil yields from the hvab coal and increased asphaltenes from the subbituminous. A remarkable effect from use of ammonium tetrathiomolybdate as a catalyst precursor is substantial increase in pristane and phytane yields. Our findings suggest that these compounds are, at least in part, bound to the coal matrix.
Book Synopsis Novel Bimetallic Dispersed Catalysts for Temperature-programmed Coal Liquefaction. Technical Progress Report, July--September 1993 by :
Download or read book Novel Bimetallic Dispersed Catalysts for Temperature-programmed Coal Liquefaction. Technical Progress Report, July--September 1993 written by and published by . This book was released on 1994 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: Development of new catalysts is a promising approach to more efficient coal liquefaction. It has been recognized that dispersed catalysts can be superior to supported catalysts for primary liquefaction of coals, because the control of initial coal dissolution or depolymerization requires intimate contact between the catalyst and coal. The primary objective of this research is to explore novel bimetallic dispersed catalysts from heterometallic molecular precursors, that can be used in low concentrations but exhibit high activity for efficient hydroliquefaction of coals under temperature-programmed conditions. This quarterly report describes the preparation of two precursors. The first is a heterometallic complex consisting of two transition metals, Mo and Ni, and sulfur in a single molecule synthesized. The second is a thiocubane type cluster consisting of iron and sulfur.
Book Synopsis Annual Report 1989-90 by : New Brunswick. Department of Transportation
Download or read book Annual Report 1989-90 written by New Brunswick. Department of Transportation and published by . This book was released on 1991 with total page 1272 pages. Available in PDF, EPUB and Kindle. Book excerpt: General activity review of associated branches and agencies to the Department which includes corporate securities registrations, a list of tenders received, and general financial data. Branches and agencies reviewed are responsible for motor vehicle activity, highway construction, traffic engineering, telecommunications and public utilities.
Book Synopsis Novel Bimetallic Dispersed Catalysts for Temperature-programmed Coal Liquefaction. Technical Progress Report, July--September 1996 by :
Download or read book Novel Bimetallic Dispersed Catalysts for Temperature-programmed Coal Liquefaction. Technical Progress Report, July--September 1996 written by and published by . This book was released on 1997 with total page 41 pages. Available in PDF, EPUB and Kindle. Book excerpt: This quarterly report describes recent work on two related subjects: (1) effect of dispersed molybdenum catalyst precursor and the influence of water addition on C-O bond cleavage, aromatic hydrogenation and hydrodeoxygenation under coal liquefaction conditions, and (2) the effect of dispersed molybdenum catalyst precursor on the molecular weight reduction and desulfurization of petroleum resids related to coal/petroleum resids coprocessing. Technical progress on the C-O bond cleavage of 2,2(prime)-dinaphthyl ether and high temperature simulated distillation GC and HDS study on catalytic upgrading of atmospheric and vacuum resids.
Download or read book China written by World Bank and published by World Bank Publications. This book was released on 1993 with total page 1422 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Republic of Korea's industrial policy has directed that nation's economy through nearly three decades of spectacular growth. But the authors of this paper maintain that this policy is showing signs of being outmoded. The time has come, the authors argue, for the Korean government to stop managing the economy's structural development and to redefine the responsibilities of business and government. Under this proposed compact, the allocation of resources would shift from the government to the private industrial and financial sectors. The transformation of the government bureaucracy from an ad hoc policy role to one of a transparent and predictable regulator is a key to the success of this undertaking. These new directions would present the government with enormous challenges. Greater competitive discipline and regulatory oversight would be required. While dealing with the complexities of the transition, the government would have to maintain macroeconomic stability and the momentum of savings and investment. For comparison, the study examines the industrial economies of France, Germany, Japan, and the United States, which underwent similar shifts.
Book Synopsis Novel Bimetallic Dispersed Catalysts for Temperature-programmed Coal Liquefaction. Quarterly Technical Progress Report, July-September 1995 by :
Download or read book Novel Bimetallic Dispersed Catalysts for Temperature-programmed Coal Liquefaction. Quarterly Technical Progress Report, July-September 1995 written by and published by . This book was released on 1996 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Novel Bimetallic Dispersed Catalysts for Temperature-programmed Coal Liquefaction. Technical Progress Report, July-September 1994 by :
Download or read book Novel Bimetallic Dispersed Catalysts for Temperature-programmed Coal Liquefaction. Technical Progress Report, July-September 1994 written by and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Estampes anciennes et modernes, dessins anciens, tableaux, aquarelles, gouaches, dessins (XIXe et XXe siècles) by :
Download or read book Estampes anciennes et modernes, dessins anciens, tableaux, aquarelles, gouaches, dessins (XIXe et XXe siècles) written by and published by . This book was released on 1946 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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