Ce_(x)Sn_(y)O_(2)双金属氧化物催化剂用于富氧条件下NO和CO的同时脱除  

Ce_(x)Sn_(y)O_(2) binary oxide catalyst for simultaneous removal of NO and CO under oxygen-rich conditions

作　　者：吉茂 程昊[1,2] 王淑瑶 张学彬 王树东[1] JI Mao;CHENG Hao;WANG Shu-yao;ZHANG Xue-bin;WANG Shu-dong(Dalian National Laboratory for Clean Energy,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院大连化学物理研究所洁净能源国家实验室,辽宁大连116023 [2]中国科学院大学,北京100049

出　　处：《应用化工》2022年第8期2209-2214,共6页Applied Chemical Industry

基　　金：国家自然科学基金区域创新联合重点项目(U20A20132);中国科学院洁净能源创新研究院合作基金(DNL201906)。

摘　　要：采用了均相沉淀法,制备了一系列Ce_(x)Sn_(y)O_(2)双金属氧化物催化剂,进行催化氨选择性催化还原(NH_(3)-SCR)反应和CO氧化反应,考察在富氧条件下系列催化剂上NH_(3)-SCR和CO氧化活性,结合XRD、BET、H_(2)-TPR,NH_(3)-TPD和XPS等表征手段对催化剂的物化性质和活性的关联进行了分析。结果表明,相比单组分CeO_(2)和SnO_(2),少量的Sn^(4+)掺杂进入CeO_(2)的晶格内,形成铈锡固溶体。增加了催化剂比表面积、孔体积和降低了催化剂的孔尺寸。此外,铈锡双金属氧化物催化剂之间产生协同作用,不仅提高了催化剂氧化还原性能、表面酸性还增加了催化剂Ce^(3+)/Ce^(4+)和表面吸附氧含量,进而有效的提高NH_(3)-SCR活性和CO活性。A series of Ce_(x)Sn_(y)O_(2)binary oxide catalysts with different Ce/Sn molar ratios were prepared by the homogeneous precipitation method to realize the selective catalytic reduction of ammonia(NH_(3)-SCR)and CO oxidation on a single catalyst.Combined with characterization methods such as XRD,BET,H_(2)-TPR,NH_(3)-TPD and XPS,the performance of NH_(3)-SCR and CO oxidation under oxygen-rich conditions was investigated.The results show that compared with single-component CeO_(2)and SnO_(2),a small amount of Sn^(4+)is successfully doped into the crystal lattice of CeO_(2)to form a cerium-tin solid solution.Increase the specific surface area and pore volume of the catalyst and reduce the pore size of the catalyst.In addition,the synergistic effect between the cerium-tin bimetallic oxide catalysts not only improves the redox performance of the catalyst,the surface acidity,but also increases the catalyst Ce^(3+)/Ce^(4+)and the adsorbed oxygen content on the surface.Thus,effectively enhance NH_(3)-SCR activity and CO oxidation.

关 键 词：NH_(3)-SCR CO氧化 同时脱除 Ce_(x)Sn_(y)O_(2)催化剂 

分 类 号：TQ426[化学工程] X[环境科学与工程]