Liquid-phase catalytic activity of sulfated zirconia from sol-gel precursors: the role of the surface features

被引：51
作者：
Ardizzone, S
Bianchi, CL
Cappelletti, G
Porta, F
机构：
[1] Univ Milan, Dept Phys Chem & Electrochem, I-20133 Milan, Italy
[2] Univ Milan, Dept Inorgan Metallorgan & Anal Chem, I-20133 Milan, Italy
来源：
JOURNAL OF CATALYSIS | 2004年 / 227卷 / 02期
关键词：
sulfated zirconia; liquid media catalyst; surface functionalities; XPS; sol-gel;
D O I：
10.1016/j.jcat.2004.07.030
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
ZrO2-SO4 powders were prepared through a single step sol-gel reaction by modulating the conditions of the alkoxide hydrolysis and polycondensation steps. Sulfuric acid or (NH4)(2)SO4 was employed as the sulfating agent. The samples were calcined at 890 K and characterized as to phase composition crystallinity (XRD) and Surface area porosity (BET method). Surface functionalities were investigated by TGA/FTIR, FTIR, DRIFTS, and XPS analyses. The liquid-medium catalytic activity was tested in the esterification of benzoic acid to methylbenzoate. The role played by the conditions of the sot-gel reaction, in affecting the surface state and the catalytic properties of the powders, is discussed. (C) 2004 Elsevier Inc. All rights reserved.
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页码：470 / 478
页数：9
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