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.