Selective catalytic reduction of NO by C2H2 over Ce-Al2O3 catalyst with rate-determining step of NO oxidation

Journal of Natural Gas Chemistry Pub Date : 2012-05-01 DOI:10.1016/S1003-9953(11)60373-3

Suhua Yan, Xinping Wang, Wenchen Wang, Zequn Liu, Jiahao Niu

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引用次数: 9

Abstract

Ce-Al₂O₃ catalysts prepared by co-precipitation are investigated both in NO oxidation by O₂ and in selective catalytic reduction of NO by C₂H₂ (C₂H₂-SCR). It is found that C₂H₂-SCR is initiated and controlled by NO oxidation to NO₂ over Al₂O₃. Ce loading on Al₂O₃ is almost inactive for NO oxidation below 350°C, since NO₂ strongly adsorbs on cerium oxide, leading to the active sites being blocked, which was characterized by temperature-programmed desorption of NO and NO₂ and Fourier transform infrared spectroscopy after NO+O₂ coadsorption over the samples. However, in the case of C₂H₂-SCR, Ce loading on Al₂O₃ significantly improves the reaction by accelerating the NO oxidation step in the temperature range of 250–450°C, since the nitrate species produced by NO₂ adsorption is an active intermediate required by C₂H₂-SCR.

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C2H2在Ce-Al2O3催化剂上选择性催化还原NO

研究了共沉淀法制备的Ce-Al2O3催化剂在O2氧化NO和C2H2选择性催化还原NO (C2H2- scr)中的作用。发现C2H2-SCR是由NO在Al2O3上氧化为NO2引发和控制的。Ce在Al2O3上的负载在350℃以下对NO的氧化几乎没有活性，这是由于NO2在氧化铈上的强烈吸附导致活性位点被阻断，通过NO和NO2的程序升温解吸和样品上NO+O2共吸附后的傅里叶变换红外光谱来表征。然而，在C2H2-SCR中，在250-450℃的温度范围内，由于吸附NO2产生的硝酸盐是C2H2-SCR所需的活性中间体，Ce在Al2O3上的负载显著提高了反应速度，加速了NO的氧化步骤。

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Journal of Natural Gas Chemistry 化学-工程：化工

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2 months