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Quantitative description of catalysis of inherent metallic species in lignite char during CO2 gasification

Halim, N., Ashik, U.P.M., Gao, X.ORCID: 0000-0003-2491-8169, Kudo, S., Sanwani, E., Norinaga, K. and Hayashi, J-I (2019) Quantitative description of catalysis of inherent metallic species in lignite char during CO2 gasification. Energy & Fuels, 33 (7). pp. 5996-6007.

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Chars from 20 lignite samples were prepared from two types of original lignites by multistage removal of inherent metallic species and subsequent pyrolysis and then were gasified with CO2. A kinetic model, which assumed the progress of noncatalytic and catalytic gasification in parallel, quantitatively described the time-dependent changes in char conversion up to 0.999 for all the chars by employing multicatalytic species having different initial activities and deactivation kinetics. A single piecewise linear function, which followed a nucleation–growth mechanism of the catalysts, showed the relationship between the total concentration of Na, K, Ca, and Fe and the initial total catalytic activity (ICA-2) for the chars. The overall rate of catalyst deactivation (ICD-2) was given by a single linear function of ICA-2 and a factor for the composition of metallic species. This function was also applicable to previously reported ICA-2/ICD-2 relationships for chars from lignite and biomass, showing fast deactivation of Fe catalyst and an important role of Mg in the promotion of catalyst deactivation.

Item Type: Journal Article
Murdoch Affiliation(s): School of Engineering and Information Technology
Publisher: American Chemical Society
Copyright: © 2019 American Chemical Society
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