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- W2071524246 abstract "The principal objective of the research program was to study the influence of carbon active sites and catalysis on gasification reactivities of coals and coal chars. Specific emphasis was given to determining the applicability of attempts to measure active-site concentration. Both isothermal and non-isothermal reactivities in air and carbon dioxide clearly indicate that for coals the reactivities decrease as the rank of coal increases. It has shown that for highly disordered chars, reactivity profiles measured by both IR and TGA methods differ for the early stages of burn-off. These differences are a result of surface oxygen complexes. Oxygen-chemisorption kinetics on selected samples in the absence of gasification have shown that chemisorption essentially occurs on highly active carbon sites. For calcium-loaded samples, the amount of oxygen chemisorbed at the same temperature is almost four times higher than that for 'pure' carbon, which indicates that the oxygen spillover from calcium onto carbon occurs. Additionally, it has been shown that the carbon active sites are energetically heterogeneous. Because of this heterogeneity, normalization of reactivity based upon a simple active surface area measured as a total stable oxygen complex was unsuccessful." @default.
- W2071524246 created "2016-06-24" @default.
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- W2071524246 date "1984-12-01" @default.
- W2071524246 modified "2023-09-24" @default.
- W2071524246 title "Importance of active sites for char gasification in oxygen (air) and carbon dioxide. Annual report, October 1983-September 1984" @default.
- W2071524246 hasPublicationYear "1984" @default.
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