Topic
Carbochemistry
About: Carbochemistry is a research topic. Over the lifetime, 1010 publications have been published within this topic receiving 16626 citations.
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TL;DR: In this paper, it is proposed that a transient divalent iron species slows the initial thermal degradation of coal and that α-Fe is responsible for enhancing the ultimate liquefaction yield.
20 citations
TL;DR: In this paper, an empirical rate equation with first order kinetics can be used to fit the experimental data and the desulfurization selectivity ratio is between 2 and 4.4 for four coal samples studied.
20 citations
TL;DR: In this paper, the interaction of barium carbonate with carbon black was studied to understand catalysed CO2 gasification of carbon, and it was shown that carbon dramatically accelerated the rate of BaCO3 decomposition to form BaO and CO2, which rapidly gasified carbon to form CO.
20 citations
TL;DR: In this paper, the effects of Fe + Ca and Ni + Ca dual catalysts on hydrogasification of coal char were studied between 1 and 30 atm and between 750 and 900 C. The results are discussed in comparison with the authors previous study using model carbons.
Abstract: The effects of Fe + Ca and Ni + Ca dual catalysts on hydrogasification of coal char were studied between 1 and 30 atm and between 750 and 900{degrees}C. Promotions of Fe- and Ni-catalyzed reactions by added Ca were observed in the reactions of all coal chars used. The degree of promotion increased with increases in the amount of added Ca, temperature, and pressure. The initial surface area of coal char was found to greatly affect the activities of dual catalysts, probably due to different dispersions of catalyst particles at the stage of impregnation. The rate of Ni-catalyzed gasification increased with time during the isothermal mode, and the added Ca accelerated the rate increase. The results are discussed in comparison with the authors previous study using model carbons.
20 citations
TL;DR: In this paper, the rates of evolution of hydrogen sulfide have been measured for the steam/oxygen gasification of a devolatilized Western Kentucky bituminous coal, a New Mexico subbituminous co-product, and a Texas lignite in a pilot-scale fluidized bed reactor and a phenomenological model has been formulated to correlate the results.
Abstract: The rates of evolution of hydrogen sulfide have been measured for the steam/oxygen gasification of a devolatilized Western Kentucky bituminous coal, a New Mexico subbituminous coal, and a Texas lignite in a pilot-scale fluidized bed reactor, and a phenomenological model has been formulated to correlate the results. The model assumes instantaneous devolatilization and partial combustion of the coal followed by rate-limited gasification of the char in a single well-mixed stage and includes kinetic correlations for the water gas shift reaction and char hydrodesulfurization. Estimated char reactivities agree well with results obtained in other studies, and the model predictions are generally satisfactory, especially considering the relative simplicity of the model. The results indicate that sulfur present in the coal as pyrite, mercaptans, aliphatic sulfides, and disulfides is converted completely, while sulfur in aryl sulfides and thiophenes is only partially converted. A substantial fraction of the sulfur converted during gasification is released in pyrolysis - 50-70% for the subbituminous coal and 35-45% for the lignite.
20 citations