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- W2007309902 abstract "Literature data for the rate of gasification of coal chars with oxygen, CO2 and steam have been reviewed to clarify the factors controlling this process. Based on steam gasification data for 95 chars from 68 coals whose carbon contents ranged from 65.0 to 93.7%, the gasification rates of the chars from lower rank coals (C < 80%) were found to be controlled mainly by the catalytic effect of coal minerals such as Ca, K, Na. However, the gasification rates of chars from higher rank coals (C > 80%) were controlled by the intrinsic reactivity of the coal, which is related to active sites in the coal matrix associated with carbon atoms bonded to heteroatoms, nascent sites, dangling carbon atoms, edge carbon atoms, etc., The number of active sites can be estimated from the amount of chemisorbed oxygen at around 100 °C. Highly dispersed metals such as Ca, K, Na and Mg act as catalysts for gasification, and the degree of dispersion of the metals can also be estimated from the amount of chemisorbed oxygen or CO2. The selectivity of the steam gasification is related to the catalytic action of the coal minerals. Finally, the problems associated with employing the chemisorbed oxygen as a reactive index are discussed." @default.
- W2007309902 created "2016-06-24" @default.
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- W2007309902 creator A5007690546 @default.
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- W2007309902 date "1989-11-01" @default.
- W2007309902 modified "2023-10-18" @default.
- W2007309902 title "Factors affecting the reactivity of coal chars during gasification, and indices representing reactivity" @default.
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- W2007309902 doi "https://doi.org/10.1016/0016-2361(89)90046-x" @default.
- W2007309902 hasPublicationYear "1989" @default.
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