caa a22 4500 463252349 CHVBK 20180405153343.0 cr unu---uuuuu 170326e20071101xx s 000 0 eng 10.1007/s10562-007-9220-8 doi (NATIONALLICENCE)springer-10.1007/s10562-007-9220-8 Epoxidation of Propylene by Molecular Oxygen Over the Ag-Y2O3-K2O/α-Al2O3 Catalyst [Elektronische Daten] [Wei Yao, Yang Guo, Xiao Liu, Yun Guo, Yan Wang, Yun Wang, Zhi Zhang, Guan Lu] The Ag/α-Al2O3 catalyst modified with rare earth metal oxide (Y2O3) and alkali metal oxide (K2O) for the epoxidation of propylene by molecular oxygen were prepared and characterized by TG-DTA, XRD and XPS. The results show that a small quantity of Y2O3 added plays a role of electron and structure-type promoters, and can change the binding energies of Ag3d and restrain the sintering of Ag crystallites during catalyst preparation. The effects of promoters loading, Ag loading, reaction temperature, and calcination atmosphere on the performance of Ag catalyst were investigated. The results show that the loadings of K2O, Y2O3 and Ag, and reaction temperature affect obviously the catalytic performance of Ag-Y2O3-K2O/α-Al2O3 for the epoxidation of propylene to propylene oxide. Under the reaction conditions of 0.1MPa, 245°C, GHSV of 2000h−1 and the feed gas of 20%C3H6/8%O2/N2, the conversion of propylene of 4% and the selectivity to propylene oxide of 46.8% were achieved over the 20%Ag-0.1%Y2O3-0.1%K2O/α-Al2O3 catalyst. Graphical Abstract: Y2O3 plays a role of electron and structure-type promoters in the Ag-Y2O3-K2O/α-Al2O3 catalyst, which can change the binding energies of Ag3d and restrain the sintering of Ag crystallites, resulting in obvious improvement of the catalytic performance of Ag-Y2O3-K2O/α-Al2O3 for the epoxidation of propylene to propylene oxide by molecular oxygen. Springer Science+Business Media, LLC, 2007 Epoxidation of propylene nationallicence Molecular oxygen nationallicence Propylene oxide nationallicence Silver catalyst nationallicence Y2O3 promoter nationallicence Yao Wei Lab for Advanced Materials, Research Institute of Industrial Catalysis, East China University of Science and Technology, 200237, Shanghai, P. R. China aut Guo Yang Lab for Advanced Materials, Research Institute of Industrial Catalysis, East China University of Science and Technology, 200237, Shanghai, P. R. China aut Liu Xiao Lab for Advanced Materials, Research Institute of Industrial Catalysis, East China University of Science and Technology, 200237, Shanghai, P. R. China aut Guo Yun Lab for Advanced Materials, Research Institute of Industrial Catalysis, East China University of Science and Technology, 200237, Shanghai, P. R. China aut Wang Yan Lab for Advanced Materials, Research Institute of Industrial Catalysis, East China University of Science and Technology, 200237, Shanghai, P. R. China aut Wang Yun Lab for Advanced Materials, Research Institute of Industrial Catalysis, East China University of Science and Technology, 200237, Shanghai, P. R. China aut Zhang Zhi Lab for Advanced Materials, Research Institute of Industrial Catalysis, East China University of Science and Technology, 200237, Shanghai, P. R. China aut Lu Guan Lab for Advanced Materials, Research Institute of Industrial Catalysis, East China University of Science and Technology, 200237, Shanghai, P. R. China aut Catalysis Letters Springer US; http://www.springer-ny.com 119/1-2(2007-11-01), 185-190 1011-372X 119:1-2<185 2007 119 10562 https://doi.org/10.1007/s10562-007-9220-8 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10562-007-9220-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Yao Wei Lab for Advanced Materials, Research Institute of Industrial Catalysis, East China University of Science and Technology, 200237, Shanghai, P. R. China aut NATIONALLICENCE 700 1- Guo Yang Lab for Advanced Materials, Research Institute of Industrial Catalysis, East China University of Science and Technology, 200237, Shanghai, P. R. China aut NATIONALLICENCE 700 1- Liu Xiao Lab for Advanced Materials, Research Institute of Industrial Catalysis, East China University of Science and Technology, 200237, Shanghai, P. R. China aut NATIONALLICENCE 700 1- Guo Yun Lab for Advanced Materials, Research Institute of Industrial Catalysis, East China University of Science and Technology, 200237, Shanghai, P. R. China aut NATIONALLICENCE 700 1- Wang Yan Lab for Advanced Materials, Research Institute of Industrial Catalysis, East China University of Science and Technology, 200237, Shanghai, P. R. China aut NATIONALLICENCE 700 1- Wang Yun Lab for Advanced Materials, Research Institute of Industrial Catalysis, East China University of Science and Technology, 200237, Shanghai, P. R. China aut NATIONALLICENCE 700 1- Zhang Zhi Lab for Advanced Materials, Research Institute of Industrial Catalysis, East China University of Science and Technology, 200237, Shanghai, P. R. China aut NATIONALLICENCE 700 1- Lu Guan Lab for Advanced Materials, Research Institute of Industrial Catalysis, East China University of Science and Technology, 200237, Shanghai, P. R. China aut NATIONALLICENCE 773 0- Catalysis Letters Springer US; http://www.springer-ny.com 119/1-2(2007-11-01), 185-190 1011-372X 119:1-2<185 2007 119 10562 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer