fulltext.study @t Gmail

Modification of MCM-22 zeolites with silylation agents: Acid properties and catalytic performance for the skeletal isomerization of n-butene

Paper ID Volume ID Publish Year Pages File Format Full-Text
52276 46867 2008 6 PDF Available
Title
Modification of MCM-22 zeolites with silylation agents: Acid properties and catalytic performance for the skeletal isomerization of n-butene
Abstract

Modified HMCM-22 zeolites, which were silylated with tetraethoxysilane (TEOS), silicon tetrachloride (SiCl4) and 8-hydroxyquinoline via a chemical vapour deposition (CVD) process, were investigated as catalysts for the skeletal isomerization of n-butene. The structure, texture, and acidic properties of the modified samples were well characterized by powder XRD, N2 adsorption, NH3-TPD, and FT-IR of d3-acetonitrile adsorption. The results indicated that the modification had little influence on the structure and the porous properties of MCM-22 zeolite. The concentration of Brønsted acid sites of MCM-22 can be adjusted by changing the treatment temperatures of silylation. The catalytic performance, especially the selectivity to isobutene, can be considerably improved by controlled CVD treatment. This is because the silylation agents can mainly diminish the Brønsted acid sites located on the external surface of zeolites, which is believed to be non-shape selective to isomerization of n-butene. The results indicate that the Brønsted acid sites on the internal surface of the zeolites should be the main active centers for the selective skeletal isomerizaiton of n-butene to isobutene.

Keywords
n-Butene; Isomerization; Silylation; Brønsted acid sites
First Page Preview
Modification of MCM-22 zeolites with silylation agents: Acid properties and catalytic performance for the skeletal isomerization of n-butene
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
Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 9, Issue 5, 20 March 2008, Pages 907–912
Authors
, , , , ,
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