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Ion induced promotion of activity enhancement of mesoporous manganese oxides for aerobic oxidation reactions

Paper ID Volume ID Publish Year Pages File Format Full-Text
45607 46416 2015 11 PDF Available
Title
Ion induced promotion of activity enhancement of mesoporous manganese oxides for aerobic oxidation reactions
Abstract

•We report synthesis of cation promoted mesoporous manganese oxides.•Enhanced catalytic activity was observed due to cation promotion.•Aerobic oxidations of alcohols and 1,3,5-trimethylbenzene were performed.•Promoted materials displayed more basicity and accessible lattice oxygen.•The developed process was less expensive, base free, and environmentally benign.

Inverse micelle templated mesoporous manganese oxide (University of Connecticut mesoporous material, UCT-1) and ion promoted mesoporous manganese oxides (UCT-18-X, X = Mg2+, Ca2+, K+, Na+ and Cs+) having trace amount of alkali metal ions as promoters with tunable porosity and crystallinity were synthesized. The synthesis was based on the use of inverse micelles as soft templates and unique NOx chemistry as established for recently discovered UCT materials. The materials were tested for selective aerobic alcohol oxidation and the catalytic activity followed the order of UCT-1 < UCT-18-Mg < UCT-18-Ca < UCT-18-K < UCT-18-Na < UCT-18-Cs. The catalytic activity was correlated to the promoter ion induced increase in basicity of the materials. The retention of an amorphous structure, low reducibility, and the effects of lattice oxygen are other key factors responsible for the enhanced catalytic activity. The UCT-18-Cs catalyst was found to oxidize various alcohols to corresponding aldehydes and ketones selectively (100% selectivity) with very high conversion (as high as 100%). The UCT-18-Cs also exhibited solvent free green oxidation of 1.3.5-trimethylbenzene to yield 3,5-dimethylbenzoic acid and (3,5-dimethylphenyl)methyl ester with >90% conversion and 90% selectivity for the acid and 9% selectivity for the ester.

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Keywords
Mesoporous; Manganese oxide; Cation promoted; Alcohol oxidation; Lattice oxygen
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Ion induced promotion of activity enhancement of mesoporous manganese oxides for aerobic oxidation reactions
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 165, April 2015, Pages 731–741
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