Acid–base characterization of heterogeneous catalysts: an up-to-date overview

Acid–base characterization of heterogeneous catalysts: an up-to-date overview In this overview, we focus on the different and current methods of acid–base characterization of heterogeneous catalysts and on their potential relation with catalytic properties in gas and liquid phases. Special emphasis is drawn on the main techniques currently employed such as the use of Hammett’s indicators, the use of basic or acidic probes of different strength for adsorption measurements in microcalorimetry and of their thermal programmed desorption, the use of other techniques such as FTIR, ESR, NMR, photoluminescence, Raman, UV–Vis, and XPS, to identify and describe acid–base sites, the use of model catalytic reactions, and of theoretical/modeling approaches. Relationships between such a characterization and catalytic properties in different acid or base reactions are discussed, and implemented for different catalysts and different reactions. The concept of thermodynamic acidity/basicity (determined via chemical physical characterization) versus reactivity (determined via catalytic properties) of acid–base sites is presented, and explains why relationships between acid–base properties and catalytic properties are very often met but are difficult to be established unambiguously and cannot be generalized. The case of acid–base properties in liquid phase “polar” (water, alcohol) and “apolar” (cyclohexane) as “effective” and “intrinsic” properties, respectively, and their relation with catalytic properties in liquid phase are also discussed. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Research on Chemical Intermediates Springer Journals

Acid–base characterization of heterogeneous catalysts: an up-to-date overview

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Publisher
Springer Netherlands
Copyright
Copyright © 2015 by Springer Science+Business Media Dordrecht
Subject
Chemistry; Catalysis; Physical Chemistry; Inorganic Chemistry
ISSN
0922-6168
eISSN
1568-5675
D.O.I.
10.1007/s11164-015-1982-9
Publisher site
See Article on Publisher Site

Abstract

In this overview, we focus on the different and current methods of acid–base characterization of heterogeneous catalysts and on their potential relation with catalytic properties in gas and liquid phases. Special emphasis is drawn on the main techniques currently employed such as the use of Hammett’s indicators, the use of basic or acidic probes of different strength for adsorption measurements in microcalorimetry and of their thermal programmed desorption, the use of other techniques such as FTIR, ESR, NMR, photoluminescence, Raman, UV–Vis, and XPS, to identify and describe acid–base sites, the use of model catalytic reactions, and of theoretical/modeling approaches. Relationships between such a characterization and catalytic properties in different acid or base reactions are discussed, and implemented for different catalysts and different reactions. The concept of thermodynamic acidity/basicity (determined via chemical physical characterization) versus reactivity (determined via catalytic properties) of acid–base sites is presented, and explains why relationships between acid–base properties and catalytic properties are very often met but are difficult to be established unambiguously and cannot be generalized. The case of acid–base properties in liquid phase “polar” (water, alcohol) and “apolar” (cyclohexane) as “effective” and “intrinsic” properties, respectively, and their relation with catalytic properties in liquid phase are also discussed.

Journal

Research on Chemical IntermediatesSpringer Journals

Published: Mar 22, 2015

References

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