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Mesoporous mixed oxide catalysts via non-hydrolytic sol–gel: A review

Paper ID Volume ID Publish Year Pages File Format Full-Text
40568 45858 2013 15 PDF Available
Title
Mesoporous mixed oxide catalysts via non-hydrolytic sol–gel: A review
Abstract

Despite the enormous amount of research dedicated to this topic in the last 20 years or so, there is still a need for a general, cost-effective methodology allowing the synthesis of mesoporous mixed oxide catalysts.This review deals with the synthesis and catalytic applications of mixed oxides prepared by the non-hydrolytic sol–gel (NHSG) process based on the reaction of chloride precursors with ether or alkoxide oxygen donors. This NHSG process offers simple, one-step syntheses of mixed oxides with well-controlled compositions and non-ordered mesoporous textures, avoiding the use of supercritical drying or templates. Over the last decade, this process has been used to prepare various mesoporous mixed oxide catalysts, which showed real potential in major reactions such as partial and total oxidation, reduction of NOx, alkene metathesis, or alkylation.The main reactions involved in this NHSG process and the characteristics of the resulting mixed oxides are described in the first part of this review, underlining the decisive advantages in terms of simplicity and of control (in terms of composition, homogeneity or texture) offered by this process. In a second part, the literature dealing with mixed oxide catalysts prepared by this NHSG method is exhaustively reviewed and the catalytic performance of NHSG catalysts is compared, whenever possible, to that of catalysts with similar compositions prepared by other methods.The excellent catalytic performances of NHSG-catalysts (notably SiTi, TiV and SiAlMo catalysts) compared to state-of-the art aerogels or ordered mesoporous materials evidences the potential of this sol–gel method, which should open the door to the synthesis of improved catalysts and to the discovery of new catalysts.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (249 K)Download as PowerPoint slideHighlights► The preparation of mixed oxides with good homogeneity and texture is a challenge. ► Opportunities offered by non-hydrolytic sol–gel routes are reviewed. ► TiSi(Me3Si)(MeSi), FeAl, Co(Si)Al, NbV(Si), V(W)(Mo)Ti, Ag(Nb)Al, MoSiAl, ZrSi, catalysts. ► Comparison with conventional catalysts. ► Oxidation, epoxidation, VOC abatement, DeNOx, metathesis, alkylation, etc.

Keywords
Nonhydrolytic sol gel; Non aqueous; Oxidation; Metathesis; NOx reduction; Mesopores
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 451, 31 January 2013, Pages 192–206
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