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Kinetic And Mechanistics Studies Of The Steam Gasification Of Coal Chars Catalyzed By Alkali Metal Salts
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Book Synopsis Kinetic and Mechanistic Studies of the Steam Gasification of Coal Chars Catalyzed by Alkali Metal Salts by : Shang Jung Yuh
Download or read book Kinetic and Mechanistic Studies of the Steam Gasification of Coal Chars Catalyzed by Alkali Metal Salts written by Shang Jung Yuh and published by . This book was released on 1984 with total page 432 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Kinetic and mechanistics studies of the steam gasification of coal chars catalyzed by alkali metal salts by : Shang Jung Yuh
Download or read book Kinetic and mechanistics studies of the steam gasification of coal chars catalyzed by alkali metal salts written by Shang Jung Yuh and published by . This book was released on 1984 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fossil Energy Update written by and published by . This book was released on 1983 with total page 844 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 1984 with total page 476 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Steam Gasification of Carbon Solids Catalyzed by a Nickel-potassium Mixed Oxide by : Jose Carrazza Duca
Download or read book Steam Gasification of Carbon Solids Catalyzed by a Nickel-potassium Mixed Oxide written by Jose Carrazza Duca and published by . This book was released on 1987 with total page 422 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Catalytic Gasification of Coal Using Eutectic Salt Mixtures by :
Download or read book Catalytic Gasification of Coal Using Eutectic Salt Mixtures written by and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The objectives of this study are to: identify appropriate eutectic salt mixture catalysts for coal gasification; assess agglomeration tendency of catalyzed coal; evaluate various catalyst impregnation techniques to improve initial catalyst dispersion; evaluate effects of major process variables (such as temperature, system pressure, etc.) on coal gasification; evaluate the recovery, regeneration and recycle of the spent catalysts; and conduct an analysis and modeling of the gasification process to provide better understanding of the fundamental mechanisms and kinetics of the process. A review of the collected literature was carried out. The catalysts which have been used for gasification can be roughly classified under the following five groups: alkali metal salts; alkaline earth metal oxides and salts; mineral substances or ash in coal; transition metals and their oxides and salts; and eutectic salt mixtures. Studies involving the use of gasification catalysts have been conducted. However, most of the studies focused on the application of individual catalysts. Only two publications have reported the study of gasification of coal char in CO2 and steam catalyzed by eutectic salt mixture catalysts. By using the eutectic mixtures of salts that show good activity as individual compounds, the gasification temperature can be reduced possibly with still better activity and gasification rates due to improved dispersion of the molten catalyst on the coal particles. For similar metal/carbon atomic ratios, eutectic catalysts were found to be consistently more active than their respective single salts. But the exact roles that the eutectic salt mixtures play in these are not well understood and details of the mechanisms remain unclear. The effects of the surface property of coals and the application methods of eutectic salt mixture catalysts with coal chars on the reactivity of gasification will be studied. Based on our preliminary evaluation of the literature, a ternary eutectic salt mixture consisting of Li- Na- and K- carbonates has the potential as gasification catalyst. To verify the literature reported, melting points for various compositions consisting of these three salts and the temperature range over which the mixture remained molten were determined in the lab. For mixtures with different concentrations of the three salts, the temperatures at which the mixtures were found to be in complete molten state were recorded. By increasing the amount of Li2CO3, the melting temperature range was reduced significantly. In the literature, the eutectic mixtures of Li- Na- and K-carbonates are claimed to have a lower activation energy than that of K2CO3 alone and they remain molten at a lower temperature than pure K2CO3. The slow increase in the gasification rates with eutectics reported in the literature is believed to be due to a gradual penetration of the coals and coal char particles by the molten and viscous catalyst phase. The even spreading of the salt phase seems to increase the overall carbon conversion rate. In the next reporting period, a number of eutectic salts and methods of their application on the coal will be identified and tested.
Book Synopsis Catalytic Gasification of Carbon by : Teus Wigmans
Download or read book Catalytic Gasification of Carbon written by Teus Wigmans and published by . This book was released on 1982 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Dissertation Abstracts International by :
Download or read book Dissertation Abstracts International written by and published by . This book was released on 1984 with total page 526 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 1983 with total page 1368 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Kinetics of Steam Gasification of Coal Char Catalyzed with Potassium Carbonate by : Norman Libni Cook
Download or read book Kinetics of Steam Gasification of Coal Char Catalyzed with Potassium Carbonate written by Norman Libni Cook and published by . This book was released on 1982 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Coal Char Gasification Using Alkali Metal Catalysts by : Michael Joseph Veraa
Download or read book Coal Char Gasification Using Alkali Metal Catalysts written by Michael Joseph Veraa and published by . This book was released on 1976 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Coal Abstracts written by and published by . This book was released on 1990 with total page 732 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Kinetic Study of the Role of Oxygen in Hydrogasification of Saran Char and Coal Char by : Michael Gerard Lussier
Download or read book A Kinetic Study of the Role of Oxygen in Hydrogasification of Saran Char and Coal Char written by Michael Gerard Lussier and published by . This book was released on 1992 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Steam Gasification of Alkali Carbonate Catalyzed Coal Char by : Gary Steven Datsko
Download or read book Steam Gasification of Alkali Carbonate Catalyzed Coal Char written by Gary Steven Datsko and published by . This book was released on 1985 with total page 588 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Steam Gasification of Carbon written by and published by . This book was released on 1993 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: Coal gasification by steam is of critical importance in converting coal to gaseous products (CO, H[sub 2], CO[sub 2], CH[sub 4]) that can then be further converted to synthetic natural gas and higher hydrocarbon fuels. Alkali and alkaline earth metals (present as oxides) catalyze coal gasification reactions and cause them to occur at significantly lower temperatures. A more fundamental understanding of the mechanism of the steam gasification reaction and catalyst utilization may well lead to better production techniques, increased gasification rates, greater yields, and less waste. We are studying the gasification of carbon by steam in the presence of alkali and alkaline earth oxides, using carbonates as the starting materials. Carbon dioxide gasification (CO[sub 2] + C --> 2CO) has been studied in some detail recently, but much less has been done on the actual steam gasification reaction, which is the main thrust of our work. In particular, the form of the active catalyst compound during reaction is still questioned and the dependence of the concentration of active sites on reaction parameters is not known. Until recently, no measurements of active site concentrations during reaction had been made. We have recently used transient isotope tracing to determine active site concentration during CO[sub 2] gasification. We are investigating the mechanism and the concentration of active sites for steam gasification with transient isotopic tracing. For this technique, the reactant feed is switched from H[sub 2]0 to isotopically-labeled water at the same concentration and tow rate. We can then directly measure, at reaction the concentration of active catalytic sites, their kinetic rate constants, and the presence of more than one rate constant. This procedure allows us to obtain transient kinetic data without perturbing the steady-state surface reactions.
Book Synopsis The Direct Production of Hydrocarbons from Coal-steam Systems by : David K. Bosshardt
Download or read book The Direct Production of Hydrocarbons from Coal-steam Systems written by David K. Bosshardt and published by . This book was released on 1973 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Comprehensive Dissertation Index by :
Download or read book Comprehensive Dissertation Index written by and published by . This book was released on 1989 with total page 1116 pages. Available in PDF, EPUB and Kindle. Book excerpt: