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Microwave calcination of Cu/Mg/Al hydrotalcite catalyst precursor

Paper ID Volume ID Publish Year Pages File Format Full-Text
40906 45870 2012 7 PDF Available
Title
Microwave calcination of Cu/Mg/Al hydrotalcite catalyst precursor
Abstract

A copper-substituted hydrotalcite (Cu1.4Mg4.4Al2.2(CO3)1.1(OH)16) has been subjected to calcination under feedback-controlled microwave heating, in which microwave power is continuously modulated to generate a defined sample temperature programme or constant sample temperature. The results show that microwave calcination results in enhanced crystallinity of the resultant oxides and spinel phase formed at high temperature, compared to conventional calcination. In addition, an additional phase, Cu2MgO3, is detected following microwave calcination, at a bulk temperature very much lower than previously reported for copper-containing hydrotalcite. The concentrations and strengths of surface basic sites are significantly higher for materials calcined using microwaves than using conventional heating. Catalytic activities in the base-catalysed transesterification of glyceryl tributyrate with methanol are also higher. We suggest that microwave calcination under feedback-control, while allowing control of material bulk temperature during calcination and preventing major temperature excursions, may allow quite large but highly localised temperature variation, for instance as water is released during dehydroxylation, which are beneficial in developing surface defects and surface basicity.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (136 K)Download as PowerPoint slideHighlights► Catalyst properties tuned using microwave calcination under feedback-control. ► Microwave calcination: power controlled by feedback from sample temperature. ► Enhanced basic and catalytic properties of oxides generated by microwave calcination.

Keywords
Catalyst; Catalysis; Calcination; Microwave; Feedback-control; Hydrotalcite; Layered double hydroxide; Mixed metal oxides; Calorimetry; Solid base
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volumes 429–430, 2 July 2012, Pages 24–30
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