中文摘要：

考察了富氧条件下SO2存在对丝光沸石负载的钴催化剂（Co/MOR）上甲烷选择催化还原NO的反应性能的影响,并采用NO程序升温脱附（NO-TPD）、X射线衍射（XRD）、H2程序升温还原（H2-TPR）和紫外可见漫反射光谱（UV-v is DRS）等技术对反应前后催化剂的NO吸附性能和结构特征进行了表征。结果表明,受SO2气氛的影响,Co/MOR催化剂上NO转化率在低于550℃时下降较大,但在高于600℃时SO2的影响不明显,而且这种影响是可逆的。SO2的存在抑制了NO在催化剂活性位上的吸附,同时在反应过程中促进了CoO物种的生成,导致催化剂活性中心数减少、催化剂活性下降。

英文摘要：

The selective catalytic reduction（SCR） of NO by CH4 in the presence of SO2 was investigated over the catalyst cobalt supported on Mordenite（Co/MOR）;both the fresh and spent catalysts were characterized by temperature-programmed desorption of NO（NO-TPD）,X-ray diffraction（XRD）,H2 temperature-programmed reduction（H2-TPR）,and UV-vis diffuse reflectance spectroscopy（UV-vis DRS）.The results indicated that the presence of SO2 in the feed leads to a decrease of NO conversion at a temperature below 550℃;however,this influence is not evident at a temperature above 600℃.Moreover,the negative effect of SO2 on the NO conversion is reversible over the Co/MOR catalyst.SO2 may inhibit the adsorption of NO on the active sites and promote the formation of CoO during the reaction,which leads to a decrease of the active sites and the activity of Co/MOR for the SCR of NO.