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Characterization of the active species in the silver/alumina system for lean NOx reduction with methanol

Paper ID Volume ID Publish Year Pages File Format Full-Text
53274 46961 2016 6 PDF Available
Title
Characterization of the active species in the silver/alumina system for lean NOx reduction with methanol
Abstract

•Role of different types of silver species for lean NOx reduction with methanol.•Reduction of silver by H2 is dependent on the composition of silver species.•Composition of Ag species influences NOx desorption in the presence of O2 and H2.

Low-temperature activity and selectivity for lean NOx reduction over silver/alumina is strongly dependent on the composition of surface silver species. This motivates the present investigation of the role of the supported silver species for the lean NOx reduction with methanol. The catalyst samples, with different composition of silver species, are characterized by temperature programmed desorption of ammonia (NH3-TPD), temperature programmed reduction with hydrogen (H2-TPR) and temperature programmed desorption with NO (NO-TPD) in oxygen excess. The small differences in acidity do not significantly influence the lean NOx reduction with methanol. However, comparison of results from H2-TPR experiments with previous characterization by UV–vis spectroscopy shows that fairly small silver species are reduced by hydrogen, possibly small silver clusters. These small silver species are likely, in addition to others, involved in the lean NOx reduction reactions. NO-TPD experiments, in the presence of oxygen and hydrogen, reveal a shift in temperature for one of the desorption peaks from the different samples. This peak is likely related to the shift in temperature for NOx reduction during methanol-SCR conditions for the compared samples.

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Keywords
Silver/alumina; Lean NOx reduction; Methanol; Silver species; Hydrogen; Desorption of NOx
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Characterization of the active species in the silver/alumina system for lean NOx reduction with methanol
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 267, 1 June 2016, Pages 76–81
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