Effect of pretreatment method of activated carbon on the catalytic reduction of NO by carbon over CuO
Effect of pretreatment method of activated carbon on the catalytic reduction of NO by carbon over CuO
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DOI：
10.1016/j.apcatb.2007.10.027
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发表时间：
2008-03
影响因子：
22.1
通讯作者：
Yuye Xue;G. Lu;Yun Guo;Yanglong Guo;Yanqin Wang;Zhigang Zhang
中科院分区：
文献类型：
--
作者：
Yuye Xue;G. Lu;Yun Guo;Yanglong Guo;Yanqin Wang;Zhigang Zhang
以椰壳活性炭为还原剂，在HNO3(N)、H2O2(H)、H2SO4(S)或H3PO4(P)水溶液中进行空气氧化或湿氧化预处理，研究了预处理方法对活性炭在CuO上还原NO的影响。结果表明：在CuO催化剂上，空气氧化AC对NO的还原活性随AC空气氧化温度的升高而增大，湿法氧化AC对NO的还原活性顺序为AC- h >AC- n >AC- s >AC- p。采用XRD、TPD、Boehm滴定等方法研究了活性炭的表面化学性质。用hno3或h2o2水溶液处理AC可改善CuO在AC上的分散。经h2o2处理的AC是CuO上NO的有效还原剂，AC- h完全还原NO的温度为270℃，比原AC低120℃。AC- h上高浓度的酸性氧基和适量的碱性位点有助于提高AC- h还原NO的转化率。
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 HNO3or H2O2aqueous solution. AC treated with H2O2is 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.