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Citation: YAO Wei, GUO Yang-Long, LU Guan-Zhong, GUO Yun, WANG Yan-Qin, ZHANG Zhi-Gang, HE Dan-Nong. Gas Phase Epoxidation of Propylene over a Modified Ag/α-Al₂O₃ Catalyst[J]. Acta Physico-Chimica Sinica, ;2010, 26(06): 1579-1584. doi: 10.3866/PKU.WHXB20100531 shu

Gas Phase Epoxidation of Propylene over a Modified Ag/α-Al₂O₃ Catalyst

1.
Laboratory for Advanced Materials, Research Institute of Industrial Catalysis, East China University of Science and Technology, Shanghai 200237, P. R. China; National Engineering Research Center for Nanotechnology, Shanghai 200241, P. R. China

Received Date: 14 October 2009
Available Online: 7 April 2010

Modified Ag/α-Al2O3 catalysts were prepared for the gas phase epoxidation of propylene by molecular oxygen. We used temperature-programmed desorption of oxygen (O2-TPD) to study the desorption behavior of oxygen from the catalyst's surface. Results showed that over the Ag/α-Al2O3 catalyst propylene was completely oxidized to CO2 and H2O. When the catalyst was modified with K2O, a small amount of propylene oxide (PO) was obtained. When the catalyst was modified with Y2O3, a very small amount of propanal and acetone was obtained. Adding 0.1% (w) Y2O3 to the Ag-K2O/α-Al2O3 catalyst significantly improved its catalytic performance for the gas phase epoxidation of propylene. Under reaction conditions of 0.1 MPa, 245 ℃, a feed gas of 20%C3H6/8%O2/72%N2 and gas hourly space velocity (GHSV) of 2000 h-1, the conversion of propylene was 4.0%and the selectivity to PO was 46.8%over the 20% (w)Ag-0.1%Y2O3-0.1%K2O/α-Al2O3 catalyst. O2-TPD showed that when the 20%Ag/α-Al2O3 catalyst was modified with Y2O3, K2O or Y2O3-K2O, the amount of adsorbed oxygen in the higher temperature region for the total oxidation of propylene decreased and the amount of adsorbed oxygen in the lower temperature region for the gas phase epoxidation of propylene was unchanged, which improves the selectivity to PO.
- Silver/alumina catalyst,
- Epoxidation of propylene,
- Propylene oxide,
- O2-TPD
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沈阳化工大学材料科学与工程学院沈阳 110142

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Gas Phase Epoxidation of Propylene over a Modified Ag/α-Al2O3 Catalyst

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通讯作者: 陈斌, bchen63@163.com

Gas Phase Epoxidation of Propylene over a Modified Ag/α-Al₂O₃ Catalyst