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Comparison of oxidation properties of Nb and Sn in mesoporous molecular sieves

Paper ID Volume ID Publish Year Pages File Format Full-Text
43724 45985 2007 9 PDF Available
Title
Comparison of oxidation properties of Nb and Sn in mesoporous molecular sieves
Abstract

Oxidation properties of niobium and tin in mesoporous matrices were investigated in oxidation of cyclic ketones, cyclic olefins and cyclic keto-olefins with hydrogen peroxide as an oxidation agent. Mesoporous molecular sieves of MCM-41 and MCM-48 types were synthesized and niobium and tin were incorporated into the structure. X-ray diffraction and nitrogen sorption isotherms confirmed a high-quality of these mesoporous molecular sieves even after incorporation of Nb and/or Sn. It was shown that niobium selectively oxidizes double bond of the substrates to epoxide followed by further hydration and forms diols and keto-diols in the second step of the reaction. On the other hand, tin carries out Baeyer–Villiger oxidation of cyclic ketones to lactones without further consecutive reactions while Nb is inactive in this reaction. When substrate contains both CC double bond and carbonyl group on the same ring, Nb oxidizes preferentially the double bond with a much higher activity than Sn.

Graphical abstractMesoporous molecular sieves containing Nb and Sn were prepared and used for oxidation of cyclohexene, cyclohexanone and cyclohex-2-en-1-one; Nb oxidizes cyclohexene to epoxide, Sn cyclohexanone to lactone; while Nb oxidizes cyclohex-2-en-1-one preferentially the double bond of cyclohex-2-en-1-one with a much higher activity than Sn. Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Mesoporous molecular sieves; Niobium; Tin; Synthesis; Oxidation properties; Cyclohexene; Cyclohexanone; Cyclohex-2-en-1-one
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Comparison of oxidation properties of Nb and Sn in mesoporous molecular sieves
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 321, Issue 1, 29 March 2007, Pages 40–48
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
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