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Glycerol dehydration over calcium phosphate catalysts: Effect of acidic–basic features on catalytic performance

Paper ID Volume ID Publish Year Pages File Format Full-Text
40627 45860 2012 11 PDF Available
Title
Glycerol dehydration over calcium phosphate catalysts: Effect of acidic–basic features on catalytic performance
Abstract

This work focuses on investigation of calcium phosphate compounds with different Ca/P ratios (1.39–1.77). Additionally, hydroxyapatite impregnated with tungsten oxide was also investigated. The structural, textural, and surface properties of these materials have been fully characterized using appropriate techniques (low-temperature adsorption–desorption of nitrogen, X-ray diffraction analysis (XRD), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy and temperature-programmed reduction (TPR)). Adsorption microcalorimetry of NH3 or SO2 was used to estimate the population, strength and strength distribution of acid and basic sites. The nature of acidic sites was determined through the adsorption/desorption of pyridine, followed by infrared spectroscopy. Catalytic performance of the catalysts was tested in the gas phase dehydration of glycerol with the intention of finding correlations between catalytic activity and surface acid–base features. Results show that Ca/P ratio, beside the already known influence on acidic/basic features, also influences red-ox properties of these materials. The investigation performed here proved that, in order to get acrolein – with high selectivity – which is formed on acid sites, it is not only necessary to provide acidity, but also to hinder basic sites. Our results also show that reducing of number and strength of acid centers increases the yield of other desired product, acetol.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (65 K)Download as PowerPoint slideHighlights► Calcium phosphates (Ca/P = 1.39–1.77) were tested in glycerol dehydration reaction. ► Hydroxyapatite impregnated with WO3 was also investigated. ► Acidic–basic properties of catalysts were correlated with catalytic activity. ► Reducing the number of basic sites increases the production of acrolein. ► Reducing of number and strength of acid centers increases the acetol yield.

Keywords
Calcium phosphate catalysts; Acid–base properties; Glycerol conversion; Acrolein; Acetol
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Glycerol dehydration over calcium phosphate catalysts: Effect of acidic–basic features on catalytic performance
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volumes 447–448, 7 December 2012, Pages 124–134
Authors
, , , , , , , ,
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