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Comprehensive IR study on acid/base properties of metal oxides

Paper ID Volume ID Publish Year Pages File Format Full-Text
40881 45869 2012 11 PDF Available
Title
Comprehensive IR study on acid/base properties of metal oxides
Abstract

Acid/base properties (type, strength, number) of a wide range of metal oxides were studied by IR (infra-red) 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 Brønsted acid sites and basic sites on metal oxides by a simple IR experiment.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (140 K)Download as PowerPoint slideHighlights► IR indexes for acid/base properties (type, strength, number) of a wide range of metal oxides. ► CD3CN for the strength of acid sites. ► CHCl3 for the strength of basic sites. ► Pyridine for the number of Brønsted/Lewis acid sites. ► Nitrobenzene for the number of basic sites.

Keywords
Solid acid; Solid base; Characterization; IR; Metal oxides; Heterogeneous catalysis
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Comprehensive IR study on acid/base properties of metal oxides
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volumes 433–434, 8 August 2012, Pages 135–145
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us