Influence of added potassium and sodium carbonates on CO₂ reactivity of the char from a demineralized inertinite rich bituminous coal

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• 作者：L. Klopper^a ; C.A. Strydom^a ; ^{christien.strydom@nwu.ac.za} ; J.R. Bunt^a ; ^b
• 关键词：Potassium carbonate ; Sodium carbonate ; Catalytic gasification ; Inertinite rich bituminous coal ; Thermal treatment
• 刊名：Journal of Analytical and Applied Pyrolysis
• 出版年：2012
• 期刊代码：46_01652370
• 类别：ch
• 出版时间：July, 2012
• 卷：96
• 期：Complete
• 页码：188-195
• 文件大小：839 K

摘要

The addition of K₂CO₃, Na₂CO₃ and a mixture of the two catalysts showed an increase in the CO₂ reactivity of the char prepared from the demineralized inertinite rich bitumious coal at 900 掳C in nitrogen. The CO₂ reactivity of the char is higher when the catalysts are added to the coal before preparing the char in comparison to addition of the catalyst to the prepared char. The distribution of the catalyst on the char particles thus seems to be better upon addition of the catalyst to the coal (before charring). An added effect could be the evolution of CO₂ during charring that may increase the surface area of the produced char. The surface area values of the chars (>400 m²/g) were higher than the values for the demineralized coal samples (approximately 150 m²/g) and the values for the char prepared from the coal with added catalysts increased from 413 to 445 m²/g. XRF, XRD and QEMSCAN analyses were performed to determine the species of K₂CO₃ and Na₂CO₃ formed during thermal treatment of the samples. KCl, NaCl, K₂O and Na₂O are some of the species that were detected.