Citation: FU Jin-song, LIANG Wu-yang, LEI Qian, SUN Bing, CHEN Hong-lin, ZHANG Xiao-ming. Enhancement of the activity and stability of Au/TS-1 catalyst in the gas-phase epoxidation of propene through alkali carbonate modification[J]. Journal of Fuel Chemistry and Technology, ;2020, 48(10): 1256-1262. shu

Enhancement of the activity and stability of Au/TS-1 catalyst in the gas-phase epoxidation of propene through alkali carbonate modification

FU Jin-song ^1,2,3 ,
LIANG Wu-yang ^1,2 ,
LEI Qian ¹ ,
SUN Bing ⁴ ,
CHEN Hong-lin ¹ ,
ZHANG Xiao-ming ^1,,

1.
Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, China
2.
University of Chinese Academy of Sciences, Beijing 100049, China
3.
College of Chemistry and Materials Science, Sichuan Normal University, Chengdu 610068, China
4.
Sinopec Research Institute of Safety Engineering, Qingdao 266000, China

Corresponding author: ZHANG Xiao-ming, xm.zhang@cioc.ac.cn
Received Date: 8 June 2020
Revised Date: 8 July 2020

Fund Project: The National Natural Science Foundation of China 21606258The project was supported by the National Natural Science Foundation of China (21606258)

Figures(5)

A serious of robust Au/TS-1 catalysts were prepared by modifying with various alkali carbonates including Na₂CO₃, K₂CO₃, Rb₂CO₃ and Cs₂CO₃ via the ultrasonic impregnation. The alkali carbonate-modified Au/TS-1 catalysts were characterized by XRD, ICP, XPS, UV-vis, FT-IR, NH₃-TPD and HAADF-STEM and their catalytic activity and stability in the gas-phase epoxidation of propene were investigated in a fixed-bed reactor in the presence of H₂ and O₂. The results indicate that the modification with alkali carbonates can decrease the surface acidity and inhibit the aggregation of Au particles; moreover, Rb₂CO₃ and Cs₂CO₃ can even reduce the content of extra-framework Ti in Rb-Au/TS-1 and Ce-Au/TS-1. The catalytic activity and stability of Au/TS-1 in the gas-phase epoxidation of propene are significantly improved after the modification with alkali carbonates. In particular, Cs₂CO₃-modified Cs-Au/TS-1 catalyst exhibits the best performance, with a propene conversion of 6.2%, selectivity of 86.2% to propene oxide (PO) and H₂ utilization efficiency of 26.2%. The results suggest that alkali carbonate modification could be a novel strategy to enhance the catalytic activity and stability of Au/TS-1 in propene epoxidation.
- alkali carbonate,
- Au/TS-1,
- propene epoxidation,
- ultrasonic impregnation,
- activity and stability
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