Activities and Stabilities of Redox Molecular Sieve Catalysts in Liquid Phase Oxidations. A Review

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Title:Activities and Stabilities of Redox Molecular Sieve Catalysts in Liquid Phase Oxidations. A Review
Creators:
Sheldon, Roger A.
Arends, Isabel W. C. E.
Lempers, Hans E. B.
Journal or Publication Title:
Collection of Czechoslovak Chemical Communications, 63, 11, pp. 1724-1742
Uncontrolled Keywords:Titanium, Metal-complexes, Molecular sieves, Porous materials, Oxidations, Heterogeneous catalysis, Redox reactions, Zeolites, Chromium, Zirconium

Abstract

The use of redox molecular sieves as heterogeneous catalysts for liquid phase oxidations with H<sub>2</sub>O<sub>2</sub> and alkyl hydroperoxides is reviewed. Emphasis is placed on titanium- and chromium-substituted molecular sieves as examples of catalysts operating <i>via </i>peroxometal and oxometal pathways, respectively. Various titanium-substituted molecular sieves were shown to be stable, heterogeneous catalysts for, <i>e.g.</i>, olefin epoxidation, but the remarkable activity of the progenitor of this family of catalysts, titanium-silicalite (TS-1), has not been equalled. The catalytic activity of chromium-substituted molecular sieves was shown to be entirely due to small amounts of homogeneous chromium species leached from the catalyst during reaction. The catalytic activities and stabilities of other materials, including zirconium-substituted hexagonal mesoporous silicas and a vanadium bipyridyl complex encapsulated in zeolite Y, were also tested. They were either unstable (vanadium) towards leaching or showed low activity (zirconium). Attempts to incorporate molybdenum in silicalite were unsuccessful and previously reported activity was shown to be due to the blank reaction. A review with 64 references.

Title:Activities and Stabilities of Redox Molecular Sieve Catalysts in Liquid Phase Oxidations. A Review
Creators:
Sheldon, Roger A.
Arends, Isabel W. C. E.
Lempers, Hans E. B.
Uncontrolled Keywords:Titanium, Metal-complexes, Molecular sieves, Porous materials, Oxidations, Heterogeneous catalysis, Redox reactions, Zeolites, Chromium, Zirconium
Divisions:Life and Chemical Sciences > Institute of Organic Chemistry and Biochemistry > Collection of Czechoslovak Chemical Communications
Journal or Publication Title:Collection of Czechoslovak Chemical Communications
Volume:63
Number:11
Page Range:pp. 1724-1742
ISSN:0010-0765
E-ISSN:1212-6950
Publisher:Institute of Organic Chemistry and Biochemistry
Related URLs:
URLURL Type
http://dx.doi.org/10.1135/cccc19981724UNSPECIFIED
ID Code:1416
Item Type:Article
Deposited On:06 Feb 2009 17:09
Last Modified:06 Feb 2009 16:09

Citation

Sheldon, Roger A.; Arends, Isabel W. C. E.; Lempers, Hans E. B. (1998) Activities and Stabilities of Redox Molecular Sieve Catalysts in Liquid Phase Oxidations. A Review. Collection of Czechoslovak Chemical Communications, 63 (11). pp. 1724-1742. ISSN 0010-0765

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