Regeneration of sintered Rh/ZrO2 catalysts via Rh re-dispersion and Rh–ZrO2 interaction

作     者：WAN Jie CAO YiDan RAN Rui LI Min XIAO Yi WU XiaoDong WENG Duan 

作者机构：Key Laboratory of Advanced Materials of Ministry of Education School of Materials Science and Engineering Tsinghua University Beijing 100084 China Haier Group Technique R&D Center Qingdao 266101 China State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University Beijing 100084 China 

出 版 物：《Science China(Technological Sciences)》 (中国科学（技术科学英文版）)

年 卷 期：2016年第59卷第7期

页      面：1023-1028页

核心收录：

学科分类：081705[工学-工业催化] 08[工学] 0817[工学-化学工程与技术] 

基　　金：supported by the National Natural Science Foundation of China(Grant No.51202116) the Ministry of Science and Technology of China(Grant No.2015AA034603) 

主　　题：Rhodium zirconia sintering regeneration re dispersion Rh–Zr interaction 

摘      要：Rh/ZrO2 catalyst was prepared by the impregnation method and then aged in N2 atmosphere with 10% steam at 1050℃ for 12 h. The regeneration of the aged catalyst was examined by slow cooling the catalyst in O2 following preheating at 950℃. The as-prepared, aged, and regenerated catalysts were characterized by X-ray diffraction, Brunauer–Emmett–Teller specific surface area analysis, and（CO＋NO） reaction activity tests, CO chemisorption, and transmission electron microscopy. The results revealed that the Rh species on ZrO2 that underwent severe sintering during the high-temperature aging process could be regenerated by the slow re-oxidation process employed herein. Owing to the remarkable increase in the degree of Rh dispersion after the regeneration process, the activity could be markedly recovered. Further investigations revealed that such a regeneration phenomenon, involving the re-dispersion of the Rh species during the slow cooling process in O2, was strongly related to the phase transformation of the ZrO2 support and the interaction between the Rh and tetragonal ZrO2 species.