Catalytic Gasification Activity of Na2CO3 and Comparison with K2CO3 for a High-Aluminum Coal Char

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• 作者：Yongwei Wang ; Zhiqing Wang ; Jiejie Huang ; Yitian Fang
• 刊名：Energy & Fuels
• 出版年：2015
• 出版时间：November 19, 2015
• 年：2015
• 卷：29
• 期：11
• 页码：6988-6998
• 全文大小：661K
• ISSN：1520-5029

文摘

The catalytic performance of Na₂CO₃ for high-aluminum coal gasification was specially investigated, and the effect of the ash constituents in Sunjiahao (SJH) high-aluminum coal char on the catalytic activity of Na₂CO₃ and a comparison with that of K₂CO₃ were also studied through steam gasification experiments of SJH char catalyzed by Na₂CO₃ or K₂CO₃ carried out using a thermogravimetric analyzer and a fixed-bed reactor at 800 掳C, respectively. The results indicate that the steam gasification rates of SJH char and acid-treated SJH char catalyzed by Na₂CO₃ are higher than those by K₂CO₃ with equal masses of catalyst. Na₂CO₃ can be used as the catalyst for high-aluminum coal gasification at 800 掳C. The effect of the ash components on the catalytic activity of Na₂CO₃ is larger than that of K₂CO₃ in the catalytic steam gasification of SJH high-aluminum coal char at 800 掳C. The X-ray diffraction (XRD) patterns of the steam gasification ashes of SJH char impregnated with Na₂CO₃ or K₂CO₃ reveal that the main composition is aluminosilicate, which is proved to have no catalytic activity. For catalytic steam gasification of acid-treated SJH char, the catalytic action of Na₂CO₃ is better because of the superior mobility and poor volatility of Na₂CO₃.