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Selective catalytic reduction of nitric oxide with hydrogen on supported Pd: Enhancement by hydrogen spillover

Paper ID Volume ID Publish Year Pages File Format Full-Text
38939 45798 2016 8 PDF Available
Title
Selective catalytic reduction of nitric oxide with hydrogen on supported Pd: Enhancement by hydrogen spillover
Abstract

•H2-SCR is a new but highly promising technology, but is poorly understood.•Two pieces of direct evidence for hydrogen spillover are shown for H2-SCR on supported Pd.•H2 spillover was found to significantly enhance the H2-SCR reaction.•Two most active H2-SCR catalysts are reported.

Two high-activity supported-Pd catalysts (Pd/V2O5/TiO2/SBA-15 and Pd/V2O5/TiO2/MCM-41) for selective catalytic reduction of NO with H2 were studied. They differ only by the mesoporous-silica support: SBA-15 vs. MCM-41. Although the SBA-15 supported catalyst had a lower surface area, it showed a higher NO conversion (95% vs. 84%, at a high space velocity of 4.6 × 104 1/h). Two pieces of direct and related evidence are shown for the role of hydrogen spillover in enhancing the catalytic activities of these two catalysts. A comparison of hydrogen adsorption isotherms (via the Benson-Boudart method) show more spillover on the SBA-15 supported catalyst. The results from the transient kinetics experiments also showed that the amount of spiltover hydrogen stored on the Pd/V2O5/TiO2/SBA-15 under dynamic reaction conditions was significantly higher than that on Pd/V2O5/TiO2/MCM-41 (7.3 μmol/g vs. 2.1 μmol/g). Catalytic performance of the two catalysts for practical applications is reported. The favorable effect of hydrogen spillover on H2-SCR could be used as a new strategy for improving the performance of noble-metal H2-SCR catalysts.

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Keywords
Selective catalytic reduction; H2-SCR; Pd-based catalysts; Hydrogen spillover; Nitric oxide reduction
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Selective catalytic reduction of nitric oxide with hydrogen on supported Pd: Enhancement by hydrogen spillover
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 514, 25 March 2016, Pages 35–42
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