Characterization and Catalytic Activity of Titanium-containing Aluminum Phosphate Prepared by Sol-gel and Nonuniform Precipitation for O-Alkylation of Catechol with Ethanol

Chemical Research in Chinese Universities ›› 2003, Vol. 19 ›› Issue (3): 330-334.

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Characterization and Catalytic Activity of Titanium-containing Aluminum Phosphate Prepared by Sol-gel and Nonuniform Precipitation for O-Alkylation of Catechol with Ethanol

PAN Chun-liu, ZHANG Wen-xiang, LI Xue-mei, JIANG Da-zhen, WU Tong-hao

College of Chemistry, Jilin University, Changchun 130023, P. R. China

Received:2002-06-09 Online:2003-08-24 Published:2011-08-06
Supported by:
Supported by the Foundation of Science of Jilin Province Science and Technique Committee(No.990546).

Abstract

Abstract: Three titanium-containing aluminum phosphate catalysts with a general formula Al_0.77Ti_0.23PO₄ were prepared by the sol-gel method at room temperature(APTS), and a nonuniform precipitation procedure at room temperature(APTR) and under reflux(APTF), respectively. The structural features and the surface properties of the three catalysts were determined by means of the physical adsorption of nitrogen at liquid N₂ temperature, XRD, UV-Vis, NH₃-TPD and IR of adsorbed pyridine. The vapor phase O-alkylation of catechol with ethanol over the prepared catalysts was studied. It was found that the activity and the selectivity of these catalysts are greatly dependent on the preparation method, and catalyst APTF shows the highest activity and selectivity. The characterization evidence indicates that the weak Brönsted acid sites were more effective for the reaction.

Key words: Catechol, Alkylation, Ethanol, Aluminum phosphate

PAN Chun-liu, ZHANG Wen-xiang, LI Xue-mei, JIANG Da-zhen, WU Tong-hao. Characterization and Catalytic Activity of Titanium-containing Aluminum Phosphate Prepared by Sol-gel and Nonuniform Precipitation for O-Alkylation of Catechol with Ethanol[J]. Chemical Research in Chinese Universities, 2003, 19(3): 330-334.

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Characterization and Catalytic Activity of Titanium-containing Aluminum Phosphate Prepared by Sol-gel and Nonuniform Precipitation for O-Alkylation of Catechol with Ethanol

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