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Citation: LIU Yi-Wu, YU Huan, ZHANG Xiao-Ming, SUO Ji-Shuan. Direct Gas-Phase Epoxidation of Propylene over Au/Ti-MCM-41(H) Catalysts[J]. Acta Physico-Chimica Sinica, ;2010, 26(06): 1585-1592. doi: 10.3866/PKU.WHXB20100606 shu

Direct Gas-Phase Epoxidation of Propylene over Au/Ti-MCM-41(H) Catalysts

1.
Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, P. R. China; Graduate University of Chinese Academy of Sciences, Beijing 100049, P. R. China

Received Date: 6 November 2009
Available Online: 19 April 2010

Microporous-mesoporous hybrid Ti-MCM-41(H) was successfully synthesized by the nano-cluster assembling method. ld nano-particles were prepared by the deposition-precipitation method. The samples were characterized by powder X-ray diffraction (XRD), nitrogen isothermal adsorption-desorption, Fourier transforminfrared (FT-IR) spectroscopy, diffuse reflectance UV-Vis (DR UV-Vis) spectroscopy, transmission electron microscopy (TEM) and inductively coupled plasma emission spectrometry (ICP-AES). The catalytic performance of the ld nano-particles was evaluated by the direct gas phase epoxidation of propylene using hydrogen and oxygen. Results revealed that the Ti-MCM-41(H) had a typical mesoporous MCM-41 structure. The results also suggested that isolated Ti(IV) was introduced into the siliceous framework of the support material. Superior catalytic performance was obtained with the ld catalyst supported on Ti-MCM-41(H) in which the Ti/Si molar ratio was 1%. Propylene conversion reached 5.4% at the initial 30 min with 74.2% propylene oxide (PO) selectivity and produced rate 73.1 g·h-1·kg-1. The conversion and PO selectivity were 4.9%and 67.3%after running 330 min on streamat 423 K.
- Propylene epoxidation,
- Microporous-mesoporous hybrid zeolite,
- Nano- ld catalyst,
- Propylene oxide
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