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Preparation and characterization of coated microchannels for the selective catalytic reduction of NOx
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2012 (English)In: Focus on Catalysis Research: New Developments / [ed] Minjae Ghang and Bjørn Ramel, New York: Nova Science Publishers , 2012, 209-236 p.Chapter in book (Refereed)
Abstract [en]

Shallow microchannels (Ø= 460 m) were successfully coated with different catalytically active phases, e.g., Cu-ZSM-5, Cu/(ZSM-5+Al2O3), Au/Al2O3, Ag/(Al2O3+Ionic liquid) and Ag/Al2O3, and tested on the hydrocarbon-assisted selective catalytic reduction of NOx (HC-SCR) with different model bio-derived fuels, i.e., methyl- and ethyl laurate produced by transesterification and hexadecane, a paraffinic component that can be produced by decarboxylation and/or decarbonylation of natural oils and fats. Characterization of the washcoats was done by means of X-ray photoelectron spectroscopy (XPS), scanning electron microscopy with energy dispersive X-ray analysis (SEM-EDXA) and laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS), showing a dependence of the metal loading with the impregnation time and the precursor concentration. The Ag/Al2O3 catalysts exhibited, in general, the highest activities towards the NOx reduction. Optima in impregnation time and concentration of AgNO3 solution displaying the highest activity in HC-SCR among the prepared Ag/Al2O3 washcoats were established. A combination of Cu-ZSM-5 or Cu/(ZSM-5+Al2O3) and the optimum Ag/Al2O3 catalyst were tested in order to improve the low temperature reduction in SCR with hexadecane as a reducing agent. The enhancement of the activity at low temperatures (< 350 °C) was up to seven-fold compared to the case when only Ag/alumina was used. The effect of the hydrocarbon concentration (hexadecane) and the presence of water in the feed were also investigated.

Place, publisher, year, edition, pages
New York: Nova Science Publishers , 2012. 209-236 p.
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Chemical Sciences
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URN: urn:nbn:se:umu:diva-40804ISBN: 978-1-62100-477-6 (print)OAI: oai:DiVA.org:umu-40804DiVA: diva2:402865
Note
Book Description: This book presents current research in the study of the principles, types and applications of catalysis. Topics discussed in this compilation include macroporous materials; a new kind of eco-compatible hybrid biocatalyst for selective reactions; new research in poylmer supported catalysts; ionic liquids as a catalyst or solvent for various organic transformations; hybrid organic-inorganic materials; preparation and characterization of coated microchannels for the selective catalytic reduction of NOx and emerging catalysts for wet air oxidation process. (Imprint: Nova)Available from: 2011-03-10 Created: 2011-03-10 Last updated: 2012-02-10Bibliographically approved

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Mikkola, Jyri-Pekka

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