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Strong influence of structures around aluminum centers constructed in polyoxotungstates for catalytic oxidation of alcohols with dioxygen in water

Paper ID Volume ID Publish Year Pages File Format Full-Text
40495 45856 2013 6 PDF Available
Title
Strong influence of structures around aluminum centers constructed in polyoxotungstates for catalytic oxidation of alcohols with dioxygen in water
Abstract

Water-soluble aluminum-coordinated polyoxotungstates, Cs4[α-PW11{Al(OH2)}O39]·8H2O (Cs-1), [(CH3)4N]4[α-PW11{Al(OH2)}O39]·8H2O (TMA-1), K6Na[(A-PW9O34)2{W(OH)(OH2)}{Al(OH)(OH2)}{Al(μ-OH)(OH2)2}2]·19H2O (KNa-2), and K7[α2-P2W17{Al(OH2)}O61]·14H2O (K-3), were used as homogeneous catalysts or catalyst precursors for the oxidation of alcohols with 1 atm molecular oxygen in a water–alcohol biphasic medium. The catalytic activities and the stabilities of polyoxoanions were significantly affected by the structures around the aluminum sites constructed in the polyoxotungstates. In particular, polyoxoanion 1 exhibited high turnover numbers and high selectivities of the corresponding carbonyl products, and the molecular structure of 1 was remarkably stable for oxidations with long time intervals.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (158 K)Download as PowerPoint slideHighlights► Alcohols were oxidized by Al-coordinated polyoxotungstates with dioxygen in water. ► The activities were affected by the structures around the aluminum sites in polyoxoanions. ► [PW11{Al(OH2)}O39]4− exhibited high turnover numbers with >99% selectivity. ► [PW11{Al(OH2)}O39]4− was remarkably stable for oxidations with long time intervals.

Keywords
Aluminum complex; Polyoxometalate; Alcohol oxidation; Molecular oxygen; Water
First Page Preview
Strong influence of structures around aluminum centers constructed in polyoxotungstates for catalytic oxidation of alcohols with dioxygen in water
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 452, 15 February 2013, Pages 69–74
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis