Comparison of catalytic activity through gas solid reaction models in CO₂ gasification of lignite with alkali metal salts and iron sulfate

College

Gokongwei College of Engineering

Department/Unit

Chemical Engineering

Document Type

Article

Source Title

Journal of Energy Engineering

Volume

23

Issue

1

First Page

58

Last Page

66

Publication Date

2014

Abstract

Catalytic gasification of a low rank coal- Inner Mongolian lignite has been carried out with carbon dioxide. The gasification reactions were performed in a thermogravimetric analyzer at temperatures of 600^{\circ}C to 900^{\circ}C. The kinetic parameters were evaluated using three different gas-solids reaction models and the prediction ability of each model were compared. Among the models evaluated, the modified volumetric model was found to correlate best both the non-catalytic and catalytic gasification reactions. The theoretical models, homogeneous and shrinking-core models, were found to satisfactorily correlate gasification reactions for the non-catalytic and FeSO_4-catalyzed reactions. In case of alkali metal catalysts, the catalytic activity was mostly pronounced at a low temperature of 600^{\circ}C and observed to decrease by 50% as the temperature was increased to 700^{\circ}C, and it remained nearly constant at temperature over 800^{\circ}C. The order of catalytic activity was found to be: K_2CO_3 > Na_2CO_3 > K_2SO_4 > FeSO_4.

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Disciplines

Chemical Engineering

Note

In Korean

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