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Micro-mesoporous composite molecular sieves H-ZSM-5/MCM-41 for methanol dehydration to dimethyl ether: Effect of SiO2/Al2O3 ratio in H-ZSM-5

Paper ID Volume ID Publish Year Pages File Format Full-Text
40597 45859 2013 8 PDF Available
Title
Micro-mesoporous composite molecular sieves H-ZSM-5/MCM-41 for methanol dehydration to dimethyl ether: Effect of SiO2/Al2O3 ratio in H-ZSM-5
Abstract

Micro-mesoporous composite molecular sieves H-ZSM-5/MCM-41 were prepared by the hydrothermal technique with alkali-treated H-ZSM-5 zeolite as source and characterized by scanning electron microscopy, transmission electron microscopy, energy dispersive spectroscopy, X-ray diffraction, N2 adsorption and desorption measurement, and NH3 temperature-programmed desorption. The effect of SiO2/Al2O3 ratio in H-ZSM-5 on the structure, surface acidity and catalytic performances of H-ZSM-5/MCM-41 for methanol dehydration to dimethyl ether were investigated. H-ZSM-5/MCM-41 prepared with H-ZSM-5 of different SiO2/Al2O3 ratios as source in which H-ZSM-5 nanoparticles were uniformly dispersed in MCM-41 matrix, had well-ordered micropores and mesopores. The acid amount and strength of moderate acid sites (TP1) of H-ZSM-5/MCM-41 can be controlled by the SiO2/Al2O3 ratio in H-ZSM-5 during the range from 25 to 50. Among these catalysts, H-ZSM-5/MCM-41 presented a comparable catalytic activity to the corresponding pure H-ZSM-5 and 100% dimethyl ether selectivity in a wider temperature range than the corresponding pure H-ZSM-5. The excellent catalytic performances were due to the highly active and uniform strong acid sites and the hierarchical porosity in the micro-mesoporous composite molecular sieves. The catalytic mechanism of H-ZSM-5/MCM-41 for the methanol dehydration to dimethyl ether was also discussed.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (368 K)Download as PowerPoint slideHighlights► We prepare H-ZSM-5/MCM-41 by hydrothermal method with alkali-treated ZSM-5 as source. ► H-ZSM-5/MCM-41 has ordered micropores and mesopores. ► Acid sites and amount distribution of H-ZSM-5/MCM-41 can be controlled by SiO2/Al2O3 ratio. ► H-ZSM-5/MCM-41 presents high activity and high DME selectivity.

Keywords
Hierarchical porosity; H-ZSM-5; Composite molecular sieve; Methanol dehydration; Dimethyl ether
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Micro-mesoporous composite molecular sieves H-ZSM-5/MCM-41 for methanol dehydration to dimethyl ether: Effect of SiO2/Al2O3 ratio in H-ZSM-5
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 450, 15 January 2013, Pages 152–159
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