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Ethanol dehydrogenation over copper catalysts on rice husk ash prepared by ion exchange

Paper ID Volume ID Publish Year Pages File Format Full-Text
44484 46034 2006 10 PDF Available
Title
Ethanol dehydrogenation over copper catalysts on rice husk ash prepared by ion exchange
Abstract

Samples of copper on rice husk ash (Cu/RHA) have been prepared by the ion exchange method, with various copper loadings, and have been calcined at different temperatures. Such samples were tested for dehydrogenation of ethanol to acetaldehyde. The samples were characterized by DSC, XRD, FTIR, TEM, XPS, TPR, BET, and H2–N2O titration techniques. FTIR spectra illustrate the formation of chrysocolla in uncalcined and calcined Cu/RHA catalyst precursors. DSC, XRD and XPS analyses illustrate that, in Cu/RHA catalyst precursor after drying at 383 K, copper is present as Cu(OH)2 species. After calcination at 723 K, copper is present as Cu2+ ions and as CuO species. After reduction of the calcined Cu/RHA sample at 523–573 K, copper is present as Cu+ and/or Cu0 species along with unreduced Cu2+ species. TEM images show that copper crystallites are spherical in shape and are evenly distributed. TPR results reveal that various copper loadings in calcined Cu/RHA catalyst precursor exhibit similar metal-support interactions (MSI). Ethanol conversion for dehydrogenation of ethanol is found to be independent of calcination temperature and has little effect on Cu loading. Ethanol is selectively converted to acetaldehyde at the reaction temperature of 483–548 K. The Cu/RHA catalysts exhibit higher catalytic activity and lower deactivation rate than Cu/SiO2 catalysts. The activity of Cu/RHA catalysts is found to depend on Cu surface area.

Keywords
Copper catalyst; Rice husk ash; Silica support; Ion exchange; Ethanol dehydrogenation; Acetaldehyde
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Ethanol dehydrogenation over copper catalysts on rice husk ash prepared by ion exchange
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 304, 10 May 2006, Pages 30–39
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