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 article, the effect of preliminary O-methylation with (CH3)2SO4, reduction with LiAlH4 and with K/isopropanol and reductive methylation with K CH 3 J on the oxygen functional group composition and liquefaction behaviour were examined for three coals with different rank.
12 citations
TL;DR: In this paper, a data-fitting process was derived to determine the rate constant kφ and kinetic parameters (activation energy E and preexponential factor A) of the Arrhenius-type rate constant, from only a single temperature-programed run.
Abstract: For the kinetic analysis of non-catalytic solid-gas reaction by thermogravimetry, the rate equation f=1- exp[- a(T- c)b], (f= fractional conversion of reactive solid, T=temperature, a, b, c = constants) was proposed to follow precisely the experimental TGA curve (f vs. T) obtained by a temperature-programed run at heating-up speed φ = dT/dθ (θ = reaction time). Assuming the reaction to be first-order with respect to weight of reactive solid, a method based on data-fitting process was derived to determine the rate constant kφ and kinetic parameters (activation energy E and preexponential factor A) of the Arrhenius-type rate constant, from only a single temperature-programed run. The proposed method was applied to experimental data on the gasification of coal chars with steam and carbon dioxide at temperatures up to 1000°C, and was confirmed to be valid and useful for the quantitative evaluation of kinetic parameters and the comparison of gasification reactivity of coal char.
12 citations
TL;DR: In this paper, the oxyanions of the highest oxidation states of several transition metals, including W, Mo, Cr and Mn, were found to catalyse the liquefaction of Illinois No. 6 coal in COH2O systems at 400°C.
12 citations
TL;DR: In this article, an Italian subbituminous coal under CO-steam conditions was used to obtain information about the chemistry of coal solubilization and oil production, and the results indicated that oil generation is a consequence of the slow and progressive transformation of preasphaltenes and asphaltene that are produced in the first steps of the reaction.
12 citations
01 Jan 2008
TL;DR: In this paper, coal rank and composition are primary factors that influence coal liquefaction behavior and although some of that influence may be overcome by increasing process severity or the use of catalysts, these options may be counterproductive in reducing operating expenses.
Abstract: Publisher Summary This chapter explains coal liquefaction, which is recognized as a competition between hydrogenation to liquid products and destructive distillation that forms solids. The principal objective of coal liquefaction is the production of liquid hydrocarbon distillate products from a coal's mostly aromatic structure to be used as transportation fuels or chemicals. Coal rank and composition are primary factors that influence liquefaction behavior and, although some of that influence may be overcome by increasing process severity or the use of catalysts, these options may be counterproductive in reducing operating expenses. The chapter explains that coals of high total sulfur content are generally derived from high saline, marine peat-forming environments in which bacteria are more active. Contribution of lipid-like organic materials by bacteria to the biomass may have as much impact on total conversion and oil production during liquefaction as sulfur.
11 citations