双金属片
催化作用
丙烯
钛
材料科学
化学工程
吸附
硅酸盐
化学
物理化学
有机化学
冶金
工程类
作者
Xiang Feng,Chaohe Yang,Xuezhi Duan,Yueqiang Cao,Bingxu Chen,Wenyao Chen,Lin Dong,Gang Qian,De Chen,Xin Zhou
标识
DOI:10.1021/acscatal.8b01324
摘要
Gradually emerging environmental concerns have triggered the development of highly efficient catalysts for propene epoxidation with H2 and O2. Unfortunately, intensifying the activity and stability is still a challenging task. Herein, Au–Ag bimetallic catalysts were deposited on titanium silicate-1 with blocked pores (TS-1-B). Via density functional theory calculations together with multiple types of characterization (e.g., high-angle annular dark-field scanning transmission electron microscopy, ultraviolet–visible, and X-ray photoelectron spectrometry), we found that the synergy between Au and Ag significantly improved the catalytic performance via not only the decrease in the Au nanoparticle size but also the enhanced oxygen adsorption and electron transfer ability from Au to O2. Furthermore, a volcano-shaped relationship between the Au/Ag ratio and catalytic performance was also established, and the Au10–Ag1/TS-1-B catalyst showed an excellent stable PO formation rate (174–233 gPO h–1 gAu–1) and a H2 efficiency of 44%, higher than those of the reported stable catalysts. The insights and methodology reported here may pave the way for maximizing Au utilization efficiency and unraveling the intrinsic structure–performance relationship of bimetallic catalysts for propene epoxidation.
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