Effect of pretreatment method of activated carbon on the catalytic reduction of NO by carbon over CuO

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• 作者：Yuye Xue ; Guanzhong Lu ; Yun Guo ; Yanglong Guo ; Yanqin Wang ; Zhigang Zhang
• 关键词：Activated carbon ; NO reduction ; CuO catalyst ; Surface treatment
• 刊名：Applied Catalysis B ; Environmental
• 出版年：2008
• 期刊代码：4_09263373
• 类别：ce
• 出版时间：1 March 2008
• 卷：79
• 期：3
• 页码：262-269
• 文件大小：707 K

摘要

The influence of pretreatment method of activated carbon (AC) made from coconut shell, on the NO reduction by AC over CuO was studied, in which AC was used as a reducing agent and pretreated by air oxidation or wet oxidation in the HNO₃(N), H₂O₂(H), H₂SO₄(S) or H₃PO₄(P) aqueous solution. The results show that over the CuO catalyst, the reductive activity of air oxidized AC for NO increases with a rise of the air oxidation temperature of AC, and the order of the reductive activity of wet oxidized AC for NO is AC-H > AC-N > AC-S > AC-P. The surface chemical properties of these ACs were studied by XRD, TPD, Boehm titration and so on. The dispersion of CuO on AC can be improved by treating AC with the HNO₃ or H₂O₂ aqueous solution. AC treated with H₂O₂ is an effective reducing agent for the reduction of NO over CuO, and the temperature of complete reduction of NO by AC-H is 270 °C, which is 120 °C lower than that by original AC. Both the high concentration of acidic oxygen groups and moderate amount of basic sites on AC-H help to increase the conversion of NO reduced by AC-H.