Influences of CO and O2 on the Reduction of N2O by Biomass Char

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• 作者：Xuebin Wang ; Yingying Xiong ; Houzhang Tan ; Yuanyi Liu ; Yanqing Niu ; Tongmo Xu
• 刊名：Energy & Fuels
• 出版年：2012
• 出版时间：June 21, 2012
• 年：2012
• 卷：26
• 期：6
• 页码：3125-3131
• 全文大小：482K
• 年卷期：v.26,no.6(June 21, 2012)
• ISSN：1520-5029

文摘

The influences of CO/O₂ in N₂O reduction by biomass char have been investigated in a fixed-bed system based on the test of homogeneous interactions between CO/O₂ and N₂O. Results show that self-decomposition of N₂O starts at about 1173 K. N₂O reduction was greatly enhanced with an increase in the CO concentration but insensitive to O₂ addition. When biomass char is loaded, the starting temperature of N₂O reduction is lowered to around 773 K. In addition, CO addition improves the interaction between N₂O and biomass char until it reaches an optimal concentration (1%), beyond which the level of improvement will decrease. The apparent activation energy for the char鈥揘₂O reaction decreases from 81 to 72 kJ mol^鈥? when CO addition reaches 0.5%. Further, the addition of O₂ at a higher temperature greatly suppresses the reduction of N₂O by biomass char, because of the vast consumption of biomass char by O₂. To minimize the effect of char consumption, a chemical sorption test was conducted at 673 K, and the results confirm that O₂ addition indeed inhibits the chemical sorption of N₂O on the surface of biomass char.