Ti-Si复合氧化物催化剂的合成、 表征及邻苯二酚O-单醚化反应性能

Abstract

Abstract: Ti-Si mixed oxides catalysts with different Ti/Si ratios were prepared by sol-gel method and characterized by means of XRD, FT-IR, N₂ adsorption, UV-vis and NH₃-TPD. The results show that the morphologies of Ti-Si mixed oxides change from anatase structure to amorphous with the addition of silicon. Both the acidic amount and strenth on the catalysts surface decrease with increasing Si content. Vapor-phase O-methylation of catechol with methanol was investigated over various Ti-Si catalysts. The results show that the sample of n(Ti) ∶n(Si)=6 ∶1 exhibits the highest activity (68%) and the activity decreases with increasing Si contents, which might relate to the amount and species of the surface acid.

Key words: catechol, methanol, guaiacol, Ti-Si mixed oxide, sol-gel

CLC Number:

O643

WU Shu-jie, LIU Gang, LI Xue-mei, JIA Ming-jun, ZHANG Wen-xiang. Preparation and Characterization of Ti-Si Mixed Oxides and Their Catalytic Activities for Vapour-phase O-Methylation of Catechol[J].J4, 2006, 44(02): 265-268.

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Preparation and Characterization of Ti-Si Mixed Oxides and Their Catalytic Activities for Vapour-phase O-Methylation of Catechol

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