Preparation and Characterization of AlPxO Catalysts and Their Catalytic Properties for the Vapour-phase O-Methylation of Catechol

Abstract

Abstract: AlP_xO(x=0, 0.33, 0.5, 1.0, 1.5, 2.0) catalysts were prepared via precipitation method and characterized by means of XRD, FTIR, solid-state MAS NMR, N₂ adsorption, NH-3-TPD and CO^-2-TPD techniques. The morphology of the catalysts changes from amorphism to crystalline with the increase of n(P)/n(Al). Both the acidic and basic amounts on the catalysts surface increase first with the increase of P contents [n(P)/n(Al)≤0.5], and then decrease dramatically with further increasing P contents. Meanwhile, vapor-phase O^-methylation of catechol with methanol was investigated over various AlP_xO catalysts. Among them, AlP_1.0O sample exhibits a good {catalytic} activity and selectivity to guaiacol, which resulted in the highest yield of guaiacol. This may mainly be attributed to the presence of suitable amounts of weak acid and base sites on the surface of the catalyst.

Key words: Aluminophosphates, Catechol, Guaiacol, Weak acid and base sites

CLC Number:

O643

TrendMD:

LIU Gang, LI Xue-Mei, ZHU Xiao-Mei, JIA Ming-Jun, WU Shu-Jie, ZHANG Wen-Xiang, JIANG Da-Zhen . Preparation and Characterization of AlP_xO Catalysts and Their Catalytic Properties for the Vapour-phase O^-Methylation of Catechol[J]. Chem. J. Chinese Universities, 2005, 26(8): 1492.

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Preparation and Characterization of AlP_xO Catalysts and Their Catalytic Properties for the Vapour-phase O^-Methylation of Catechol

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