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Citation: SUN Fei-Fei, ZHONG Shun-He. Chemsorption of Supported Au/TiO₂ Catalyst in Direct Epoxidation of Propylene[J]. Chinese Journal of Applied Chemistry, ;2003, 20(9): 849-852. shu

Chemsorption of Supported Au/TiO₂ Catalyst in Direct Epoxidation of Propylene

SUN Fei-Fei ,
ZHONG Shun-He ^,

1.
College of Chemical Engineering, Tianjing University, Tianjin 300072

Corresponding author: ZHONG Shun-He,
Received Date: 10 January 2003
Available Online: 12 May 2003
Fund Project: 国家自然科学基金资助项目(20076035) (20076035)

The supported catalyst Au/TiO₂ was prepared by deposition-precipitation method. Chemsorbility of the catalyst was studied by in situ IR and TPD techniques and activity of the catalyst was tested in a micro-reactor. The results revealed that propylene is chemisorbed on Lewis acid sites Tiⁿ⁺ on the surface of Au/TiO₂ through C-C bond and newly formed propylene oxide is chemisorbed on Tiⁿ⁺ through the oxygen of its epoxy ring. The selectivity of propylene oxide in propylene epoxidation over Au/TiO₂ is 93% and conversion of propylene is 0.76%. Au nano-particles adsorb H₂ and O₂ and transform them into peroxide species, which diffuse to Ti site, leading to the formation of propylene oxide.
- Au/TiO₂,
- propylene,
- epoxidation
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Chemsorption of Supported Au/TiO2 Catalyst in Direct Epoxidation of Propylene

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通讯作者: 陈斌, bchen63@163.com

Chemsorption of Supported Au/TiO₂ Catalyst in Direct Epoxidation of Propylene