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Methylation of naphthalene on MTW-type zeolites. Influence of template origin and substitution of Al by Ga

Paper ID Volume ID Publish Year Pages File Format Full-Text
42483 45927 2010 10 PDF Available
Title
Methylation of naphthalene on MTW-type zeolites. Influence of template origin and substitution of Al by Ga
Abstract

Two templates, methyltriethylammonium bromide (MTEA) and tetraethylammonium bromide (TEA) were used to synthesize aluminosilicate ZSM-12 zeolites. Additionally, zeolites isomorphously substituted (partially or totally) by gallium were prepared with MTEA. Various techniques including XRD, scanning electron microscopy (SEM), N2 adsorption, NH3-TPD, Fourier transform infrared (FTIR) spectroscopy and MAS NMR were used to monitor the physico-chemical properties of these solids. Catalytic properties of the prepared zeolites were studied in the methylation of naphthalene. Higher conversion of naphthalene, higher content of 2,6-DMN among total DMNs and higher 2,6-/2,7-DMN ratio were observed on Al-TEA sample and on Ga-containing zeolites compared to Al-MTEA. The specific morphology of zeolite crystals and the presence of secondary mesopores were identified to be responsible for remarkable catalytic performance of MTW-type zeolites.

Graphical abstractFour ZSM-12 zeolites: Al-TEA, Al-MTEA, Ga/Al-MTEA and Ga-MTEA were investigated in the methylation of naphthalene. It was found that the catalysts exhibit drastically different properties regarding the production of dimethylnaphthalenes. Their distribution differs from that of thermodynamic equilibrium to a great extent in all cases, but the mode of this difference varies for each of the studied samples. This is mainly attributed to a presence of secondary mesopores in Al-TEA, Ga/Al-MTEA and Ga-MTEA zeolites.Figure optionsDownload full-size imageDownload high-quality image (117 K)Download as PowerPoint slide

Keywords
ZSM-12 zeolite; Isomorphous substitution; Methylation; 2,6-Dimethylnaphthalene; Selectivity
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Methylation of naphthalene on MTW-type zeolites. Influence of template origin and substitution of Al by Ga
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 375, Issue 2, 1 March 2010, Pages 279–288
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
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
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