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Ga and Al containing MCM-41 mesoporous molecular sieves: Structure and catalytic performance for the 4,6 dimethyldibenzothiophene hydrodesulfurization

Paper ID Volume ID Publish Year Pages File Format Full-Text
54804 47027 2013 7 PDF Available
Title
Ga and Al containing MCM-41 mesoporous molecular sieves: Structure and catalytic performance for the 4,6 dimethyldibenzothiophene hydrodesulfurization
Abstract

MCM-41 type materials containing Al and Ga (Al–Ga-MCM-41) were prepared by a synthesis gel using cethyltrimethylammonium chloride as surfactant. In the preparation, Si/(Al + Ga) ratios were 21, 27 and 32 in the gel, maintaining the concentration of Al constant. The structures of the materials were characterized by X-ray diffraction (XRD), nitrogen physisorption, Fourier transform infrared spectroscopy (FTIR) of adsorbed pyridine, 27Al MAS NMR, 29Si MAS NMR and energy dispersive analysis of X-ray (EDX). Al–Ga-MCM-41 exhibited prominent characteristics as supports for the Ni–Mo–S type catalysts used in the hydrodesulfurization of 4,6-dimethyldibenzothiphene (4,6 DMDBT). The presence of Ga was detected by TEM with a resolution of 1.9 Å point to point; therefore the Ga is in the lattice. The amount of Ga in the support enhanced the activity of the catalysts and modified the products distribution. The maximum catalytic activity and direct desulfurization capability was achieved on the catalyst NiMo/Al–Ga-MCM-41 with Si/(Al + Ga) = 32 molar ratio.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (120 K)Download as PowerPoint slideHighlights► Al–Ga-MCM-41 were evaluated as supports for Ni–Mo–S catalysts in the HDS of 4,6-dimethyldibenzothiphene (4,6 DMDBT). ► The amount of Ga in the support modified the product distribution for the HDS of 4,6-dimethyldibenzothiphene (4,6 DMDBT). ► The amount of direct desulfurization products was higher using NiMo/Al–Ga-MCM-41 with Si/(Al + Ga) = 32.

Keywords
MCM-41; Gallium; Hydrodesulfurization; 4,6-Dimethyldibenzothiophene; Nickel–molybdenum sulfides; Isomerization
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Ga and Al containing MCM-41 mesoporous molecular sieves: Structure and catalytic performance for the 4,6 dimethyldibenzothiophene hydrodesulfurization
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 212, 1 September 2013, Pages 45–51
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