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Glycerol dehydration catalyzed by MWW zeolites and the changes in the catalyst deactivation caused by porosity modification

Paper ID Volume ID Publish Year Pages File Format Full-Text
39304 45817 2015 8 PDF Available
Title
Glycerol dehydration catalyzed by MWW zeolites and the changes in the catalyst deactivation caused by porosity modification
Abstract

•Microporous, pillared and exfoliated zeolites were used in dehydration of glycerol.•Mesopores minimized diffusion limitations and increased the catalyst lifetime.•Two families of coke were identified on the spent catalysts.

Members of the layered MWW family, including microporous MCM-22, pillared MCM-36 and delaminated ITQ-2 zeolites, were used as catalysts for the gas phase dehydration of glycerol. The chemical, structural and surface properties of the catalysts were characterized by X-ray diffraction, N2 adsorption–desorption isotherms, SEM, TEM, NH3-TPD and pyridine chemisorption followed by IR spectroscopy. The results clearly showed that the modified zeolites with designed mesopore structure enabled rapid diffusion and consequently improved the glycerol conversion. Characterization of the acid sites revealed that the relative abundance of Brønsted and Lewis acid sites influenced the efficiency of the catalysis performed by these materials. 13C NMR spectra of the spent catalysts confirmed that differences in the nature and amount of carbonaceous deposits are related to the pore structures of the catalysts, with greater formation of polyaromatic compounds inside zeolite pores, while polyglycols are preferentially formed at the external surfaces of the MCM-36 and ITQ-2 zeolites, as expected for the more exposed sheets.

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Keywords
MWW zeolites; Glycerol dehydration; Deactivation; Pillarization; Delamination
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Glycerol dehydration catalyzed by MWW zeolites and the changes in the catalyst deactivation caused by porosity modification
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 495, 5 April 2015, Pages 84–91
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Don't Miss Today's Special Offer
Price was $35.95
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Price after discount Only $4.95
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Full-text PDF Download
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