TY - JOUR
T1 - Catalytic oxidation of ethyl acetate over silver catalysts supported on CeO 2 with different morphologies
AU - Qin, Yu
AU - Liu, Xiaolong
AU - Zhu, Tianle
AU - Zhu, Tingyu
N1 - Publisher Copyright:
© 2019
PY - 2019/5/1
Y1 - 2019/5/1
N2 - In this study, the Ag/CeO 2 catalysts with three different morphologies of ceria nanocubes (CeO 2 -c), nanorods (CeO 2 -r) and nano-octahedra (CeO 2 -o) as supports were prepared by wet impregnation. Various characterizations such as XRD, BET, TEM/HRTEM, HAADF-STEM, XPS and H 2 -TPR were conducted, and a four step catalytic transformation was accordingly proposed. It was found that Ag/CeO 2 -c showed much more metallic Ag, active oxygen species and higher reducibility than those of Ag/CeO 2 -r and Ag/CeO 2 -o mainly due to the morphology effect. Ag/CeO 2 and CeO 2 catalysts were evaluated in the oxidation of ethyl acetate, and their catalytic activities were in the sequence of Ag/CeO 2 -c > Ag/CeO 2 -r > CeO 2 -r > CeO 2 -c > Ag/CeO 2 -o > CeO 2 -o. Besides, in-situ FTIR results revealed that the organic species on the catalyst surface were mainly acetates and adsorbed ethyl acetate for Ag/CeO 2 -c and CeO 2 -c, respectively, suggesting that addition of Ag promoted the complete oxidation of ethyl acetate.
AB - In this study, the Ag/CeO 2 catalysts with three different morphologies of ceria nanocubes (CeO 2 -c), nanorods (CeO 2 -r) and nano-octahedra (CeO 2 -o) as supports were prepared by wet impregnation. Various characterizations such as XRD, BET, TEM/HRTEM, HAADF-STEM, XPS and H 2 -TPR were conducted, and a four step catalytic transformation was accordingly proposed. It was found that Ag/CeO 2 -c showed much more metallic Ag, active oxygen species and higher reducibility than those of Ag/CeO 2 -r and Ag/CeO 2 -o mainly due to the morphology effect. Ag/CeO 2 and CeO 2 catalysts were evaluated in the oxidation of ethyl acetate, and their catalytic activities were in the sequence of Ag/CeO 2 -c > Ag/CeO 2 -r > CeO 2 -r > CeO 2 -c > Ag/CeO 2 -o > CeO 2 -o. Besides, in-situ FTIR results revealed that the organic species on the catalyst surface were mainly acetates and adsorbed ethyl acetate for Ag/CeO 2 -c and CeO 2 -c, respectively, suggesting that addition of Ag promoted the complete oxidation of ethyl acetate.
KW - Catalytic oxidation
KW - CeO
KW - Ethyl acetate
KW - Morphology
KW - Silver
UR - https://www.scopus.com/pages/publications/85062734935
U2 - 10.1016/j.matchemphys.2019.02.065
DO - 10.1016/j.matchemphys.2019.02.065
M3 - 文章
AN - SCOPUS:85062734935
SN - 0254-0584
VL - 229
SP - 32
EP - 38
JO - Materials Chemistry and Physics
JF - Materials Chemistry and Physics
ER -