CIESC Journal ›› 2018, Vol. 69 ›› Issue (S1): 72-79.doi: 10.11949/j.issn.0438-1157.20180789

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Preparation and characterization of MCM-41 supported Pt-Al catalysts

CHEN Xiuying, XIE Huilin, HU Wenbin, ZHOU Xinhua, ZHOU Hongjun, SHU Xugang   

  1. Guangzhou Key Laboratory of Efficient Utilization of Agrochemicals, College of Chemistry and Chemical Engineering, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, Guangdong, China
  • Received:2018-07-13 Revised:2018-07-16
  • Supported by:

    supported by the National Natural Science Foundation of China (21476272), the Natural Science Foundation of Guangdong Province (2015A030313595), the Guangdong Science and Technology Department Project (2014A010105049,2015A040404044), the Huizhou Science and Technology Project (2013B050013014) and the Huizhou Daya Bay District Science and Technology Project (2015A01007).

Abstract:

The Pt-Al/MCM-41 catalysts were prepared by impregnation method, using mesoporous silica MCM-41 as carrier, anhydrous alcohol as dissolvent and AlCl3 as accelerator. The catalysts were systematically characterized by X-ray diffraction assay, X-ray photoelectron spectroscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, N2 adsorption-desorption and automatic chemical adsorption analyzer. The effects of different Pt-Al interaction sequences on the structure and performance of the catalysts were emphatically discussed, and the catalytic application in hydrosilylation was investigated. The results showed that different Pt-Al interaction sequences had an effect on degree of order and acidity of the catalysts and the dispersion of platinum particle, among them, the Pt-Al/MCM-41 catalyst has the relatively best degree of order, acidity and platinum dispersion. The order of influence of different catalysts on the conversion with reaction time in the hydrosilylation of heptamethyltrisiloxane and allyl polyether is Pt-Al/MCM-41 > Pt+Al/MCM-41 > Al-Pt/MCM-41 > Pt/MCM-41.

Key words: support, hydrosilylation, aluminum chloride, catalysis, reactivity

CLC Number: 

  • TQ426.82

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