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Nanometric palladium confined in mesoporous silica as efficient catalysts for toluene oxidation at low temperature

Paper ID Volume ID Publish Year Pages File Format Full-Text
46448 46440 2012 12 PDF Available
Title
Nanometric palladium confined in mesoporous silica as efficient catalysts for toluene oxidation at low temperature
Abstract

Short column SBA-15 supported Pd mesoporous catalysts with controllable acidity and expanded microporosity were firstly prepared through a simple “two-solvents” approach. The catalytic performances of the synthesized catalysts were evaluated for toluene oxidation. The characterization results reveal that Al atoms prefer to be tetrahedrally coordinated in the framework of the synthesized materials, and the acid sites can significantly promote Pd particle dispersion and metallic Pd oxidation due to their electrophilic characters. The Pd-confined catalysts possess high toluene turnover frequencies and toluene can be totally converted to CO2 and H2O below 210 °C. The oxidation reaction can be suppressed by water vapor due to the formation of inactive Pd-hydroxides, and the synthesized catalyst has a good hydrothermal stability and high tolerance to moisture. Both the specific surface area and the toluene adsorption/desorption property are not the main factors determining the catalytic activity. Overall, the toluene oxidation performance is closely related to the support microporosity and acidity, the Pd dispersion and the CO2 desorption capability.

Graphical abstract.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Short column mesoporous silica with controllable acidity, expanded microporosity and 3-D micro/mesoporous composite structure. ► Both catalysts combined promoted accessibility and enhanced acid strength. ► Highly dispersed Pd-confined catalysts with improved hydrothermal stability. ► Catalyst with high turnover frequency and superior low temperature efficiency.

Keywords
Mesoporous silica; Two-solvents technique; Pd-confined; Controllable acidity; Volatile organic compounds
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Nanometric palladium confined in mesoporous silica as efficient catalysts for toluene oxidation at low temperature
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 111–112, 12 January 2012, Pages 46–57
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