Direct hydrogenation of aromatic carboxylic acids to their corresponding aldehydes with zinc oxide catalysts

被引：37

作者：

Hölderich, WF ^{[1
]}

Tjoe, J ^{[1
]}

机构：

[1] Univ Technol, RWTH Aachen, Dept Chem Technol & Heterogeneous Catalysis, D-52062 Aachen, Germany

来源：

APPLIED CATALYSIS A-GENERAL | 1999年 / 184卷 / 02期

关键词：

hydrogenation; aromatic aldehydes; ZnO;

D O I：

10.1016/S0926-860X(99)00097-6

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：

High yields of aromatic aldehydes were obtained by direct hydrogenation of aromatic carboxylic acids over different zinc oxide catalysts having distinctive surface properties. The reaction is carried out in a fixed bed reactor in gas phase at 330-350 degrees C, High selectivity of 96% of benzaldehyde at 100% conversion of benzoic acid was achieved using a zinc oxide catalyst having very weakly acidic surface properties in addition to basic sites. The catalysts were characterized by XRD and N(2)- adsorption isotherms for the determination of BET-surface and porosity. The strength of acid and basic sites was determined by titration in the presence of Hammett-indicators. Very weakly acid sites were identified by pyridine adsorption combined with FT-IR-spectroscopy. (C) 1999 Elsevier Science B.V. All rights reserved.

引用

页码：257 / 264

页数：8

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