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The remarkable promotional effect of Sn on CeVO4 catalyst for wide temperature NH3-SCR process by citric acid-assisted solvothermal synthesis and post-hydrothermal treatment†
Catalysis Science & Technology ( IF 4.4 ) Pub Date : 2018-09-25 00:00:00 , DOI: 10.1039/c8cy01841c Xiaosheng Huang 1, 2, 3, 4, 5 , Guodong Zhang 1, 2, 3, 4, 5 , Fang Dong 1, 2, 3, 4, 5 , Zhicheng Tang 1, 2, 3, 4, 5
Catalysis Science & Technology ( IF 4.4 ) Pub Date : 2018-09-25 00:00:00 , DOI: 10.1039/c8cy01841c Xiaosheng Huang 1, 2, 3, 4, 5 , Guodong Zhang 1, 2, 3, 4, 5 , Fang Dong 1, 2, 3, 4, 5 , Zhicheng Tang 1, 2, 3, 4, 5
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A series of CeVO4 catalysts were prepared by citric acid-assisted solvothermal synthesis and hydrothermal methods. The Sn-CeVO4 exhibited superior NH3-SCR performance since abundant of cerium vanadate coexisting with a spot of CeO2 and a mass of surface acid sites forming in the solvothermal synthesis process. A number of structural defects increased after Sn was doped into the CeVO4 system, and the electron transfer between cerium and vanadium was also accelerated significantly. Thus the temperature window of Sn-CeVO4 was broadened and its tolerance to H2O and SO2 was improved dramatically. In addition, post-hydrothermal treatment was essential for the fresh CeVO4 catalyst to achieve better catalytic activity. The results illustrated that surface reconstruction and the chemical states of surface active species occurred slight changes after the post-hydrothermal treatment, which was conducive to expose more active sites to enhance its catalytic activity. Totally, the large surface area of cerium vanadate, strong interaction among tin, cerium and vanadium, large number of acid sites and oxygen vacancies, structural defects as well as exposed active sites were beneficial to the improvement of Sn-CeVO4 catalytic performance in NH3-SCR process.
中文翻译：
锡对柠檬酸辅助溶剂热合成和后水热处理的NH 3 -SCR宽温工艺CeVO 4催化剂的显着促进作用†
柠檬酸辅助溶剂热合成和水热法制备了一系列CeVO 4催化剂。Sn-CeVO 4表现出优异的NH 3 -SCR性能，因为大量的钒酸铈与CeO 2斑点并在溶剂热合成过程中形成大量表面酸位并存。将Sn掺杂到CeVO 4系统中后，许多结构缺陷增加，并且铈和钒之间的电子转移也显着加速。因此，Sn-CeVO 4的温度窗口变宽，并且其对H 2 O和SO 2的耐受性得到了极大的改善。另外，水后处理对于新鲜的CeVO 4催化剂获得更好的催化活性是必不可少的。结果表明，水热处理后，表面活性物质的表面重构和化学状态发生了细微变化，有利于暴露更多的活性位点，从而增强了其催化活性。总的来说，钒酸铈的大表面积，锡，铈和钒之间的强相互作用，大量的酸位和氧空位，结构缺陷以及暴露的活性位点都有助于改善NH中的Sn-CeVO 4催化性能。3- SCR过程。
更新日期：2018-09-25
中文翻译：
锡对柠檬酸辅助溶剂热合成和后水热处理的NH 3 -SCR宽温工艺CeVO 4催化剂的显着促进作用†
柠檬酸辅助溶剂热合成和水热法制备了一系列CeVO 4催化剂。Sn-CeVO 4表现出优异的NH 3 -SCR性能，因为大量的钒酸铈与CeO 2斑点并在溶剂热合成过程中形成大量表面酸位并存。将Sn掺杂到CeVO 4系统中后，许多结构缺陷增加，并且铈和钒之间的电子转移也显着加速。因此，Sn-CeVO 4的温度窗口变宽，并且其对H 2 O和SO 2的耐受性得到了极大的改善。另外，水后处理对于新鲜的CeVO 4催化剂获得更好的催化活性是必不可少的。结果表明，水热处理后，表面活性物质的表面重构和化学状态发生了细微变化，有利于暴露更多的活性位点，从而增强了其催化活性。总的来说，钒酸铈的大表面积，锡，铈和钒之间的强相互作用，大量的酸位和氧空位，结构缺陷以及暴露的活性位点都有助于改善NH中的Sn-CeVO 4催化性能。3- SCR过程。
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