Comprehensive IR study on acid/base properties of metal oxides

被引：351

作者：

Tamura, Masazumi ^{[2
]}

Shimizu, Ken-ichi ^{[1
]}

Satsuma, Atsushi ^{[3
]}

机构：

[1] Hokkaido Univ, Catalysis Res Ctr, Sapporo, Hokkaido 0010021, Japan

[2] Kao Corp, Global R&D, Wakayama 6408580, Japan

[3] Nagoya Univ, Grad Sch Engn, Dept Mol Design & Engn, Nagoya, Aichi 4648603, Japan

来源：

APPLIED CATALYSIS A-GENERAL | 2012年 / 433卷

关键词：

Solid acid; Solid base; Characterization; IR; Metal oxides; Heterogeneous catalysis; ADSORBED PROBE MOLECULES; AMMONIA TITRATION METHOD; ACIDIC HYDROXYL-GROUPS; SURFACE-ACIDITY; INFRARED-SPECTROSCOPY; SOLID ACIDS; ADSORPTION; CATALYSTS; ZEOLITES; PYRIDINE;

D O I：

10.1016/j.apcata.2012.05.008

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：

Acid/base properties (type, strength, number) of a wide range of metal oxides were studied by IR (infrared) spectroscopy. Ammonia, pyridine and CD3CN were used as probe molecules for acidity measurement. CO2, CHCl3, benzaldehyde and nitrobenzene were used for basicity measurement. Pyridine for the nature and number of acid sites. CD3CN for the strength of acid sites, CHCl3 for the strength of basic sites and nitrobenzene for the number of basic sites were found to be suitable probes. The absorption coefficients of pyridine for acidic sites and nitrobenzene for basic sites, estimated for various metal oxides by IR coupled with mass spectrometry, were within +/- 10% of the average value, which indicates that the integrated molar extinction coefficients could be used for semi-quantification of acid/base sites of various oxides samples. The comprehensive IR results in this study will be available to characterize properties of Lewis and Bronsted acid sites and basic sites on metal oxides by a simple IR experiment. (C) 2012 Elsevier B.V. All rights reserved.

引用

页码：135 / 145

页数：11

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