文献类型：期刊文献

英文题名：Fabrication of Hierarchically Porous RuO2-CuO/Al-ZrO2 Composite as Highly Efficient Catalyst for Ammonia-Selective Catalytic Oxidation

作者：Cui, Xiangzhi[1];Chen, Lisong[1];Wang, Yongxia[1];Chen, Hangrong[1];Zhao, Wenru[2];Li, Yongsheng[2];Shi, Jianlin[1]

机构：[1]Chinese Acad Sci, Shanghai Inst Ceram, State Key Lab High Performance Ceram & Superfine, Shanghai 200050, Peoples R China;[2]E China Univ Sci & Technol, Sch Mat Sci & Engn, Minist Educ, Key Lab Ultrafine Mat, Shanghai 200237, Peoples R China

年份：2014

卷号：4

期号：7

起止页码：2195

外文期刊名：ACS CATALYSIS

收录：;EI(收录号：20142817928625);WOS:【SCI-EXPANDED(收录号:WOS:000338693100014)】；

基金：We gratefully acknowledge the financial support from the National Key Basic Research Program of China (2013CB933200), National Natural Science Foundation of China (51202278), Key Program for Science and Technology Commission of Shanghai Municipality (11JC1413400), and National Natural Science Foundation of Shanghai (12ZR1435200).

语种：英文

外文关键词：hierarchically porous; RuO2-CuO/Al-ZrO2; NH3; selective catalytic oxidation; nanocomposites; synergetic catalysis

摘要：A hierarchically porous RuO2-CuO/(Al-ZrO2) nanocomposite, with RuO2 and CuO nanocrystals being homogeneously dispersed in the hierarchically porous structure of Al-doped ZrO2 (Al-ZrO2), has been developed by a hydrothermal and wet impregnation method for efficient ammonia-selective catalytic oxidation (SCO) applications. The microstructures of the RuO2-CuO/Al-ZrO2 nanocomposites were characterized by XRD, TEM, FESEM, EDX elemental mapping, and N-2 sorption. XPS analysis and H-2-TPR results indicate that the hierarchically porous RuO2-CuO/Al- ZrO2 composites possess a large number of oxygen vacancies and surface catalytic active sites, which endows the composite with high catalytic activity and N-2 selectivity for NH3 oxidation. NH3 complete oxidization has been achieved at 195 degrees C with 100% N-2 selectivity over an obtained RuO2-CuO/Al-ZrO2 composite at RuO/CuO = 1:1 (weight rate). The high efficiency of hierarchically porous RuO2-CuO/Al-ZrO2 nanocomposites for ammonia SCO reaction has been attributed to the synergetic catalytic effects among the metal oxides, in which the porous Al-ZrO2 support promotes oxygen activation by the generation of oxygen vacancies due to the Al doping, and the ultrahigh catalytic activity of RuO2 is responsible for the active NH3 oxidation. Successively, CuO plays a role of NO intermediate conversion for enhanced N-2 selectivity.