NOx reduction to N2 with commercial fuel in a real diesel engine exhaust using a dual bed of Pt/beta zeolite and RhOx/ceria monolith catalysts

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Title: NOx reduction to N2 with commercial fuel in a real diesel engine exhaust using a dual bed of Pt/beta zeolite and RhOx/ceria monolith catalysts
Authors: Rico Pérez, Verónica | García Cortés, Jorge Manuel | Salinas Martínez de Lecea, Concepción | Bueno López, Agustín
Research Group/s: Materiales Carbonosos y Medio Ambiente
Center, Department or Service: Universidad de Alicante. Departamento de Química Inorgánica | Universidad de Alicante. Instituto Universitario de Materiales
Keywords: deNOx | deN2O | SCR | Pt catalyst | RhOx catalyst | Monolith catalyst
Knowledge Area: Química Inorgánica
Issue Date: 18-Dec-2013
Publisher: Elsevier
Citation: Chemical Engineering Science. 2013, 104: 557-564. doi:10.1016/j.ces.2013.09.052
Abstract: The Selective Catalytic Reduction (SCR) of NOx has been performed in a real diesel engine exhaust using commercial diesel fuel as a reducing agent and a dual bed catalytic system consisting of a Pt/beta zeolite/honeycomb monolith SCR catalyst located upstream a N2O decomposition RhOx/Ce0.9Pr0.1O2/honeycomb monolith catalyst. Cordierite honeycomb monoliths (diameter 2.3 cm; length 7.5 cm; 400 cpsi) were washcoated with beta zeolite and 1% platinum (on zeolite basis) was impregnated afterwards. The effect of the beta zeolite slurry viscosity on the dip-coating process was studied in detail, concluding that slurries with viscosity ≤23 mPa s must be used, otherwise the zeolite suspension was not able to penetrate into the monolith channels. The dip-coating method was optimized for the Pt/beta zeolite/honeycomb monolith preparation. The RhOx/Ce0.9Pr0.1O2/honeycomb monolith catalyst, used for N2O decomposition, was prepared by nitrate precursor decomposition. The maximum NOx removal achieved with the Pt/beta zeolite/honeycomb monolith was 50% at 350 °C. The production of N2O as undesired NOx reduction product, which is a drawback of platinum SCR catalysts, has been solved by using the dual bed configuration, where both monolith catalysts operated at the same temperature, and 100% N2 selectivity has been obtained.
Sponsor: The authors thank the financial support of Generalitat Valenciana (Project Prometeo 2009/047), the Spanish ministries of Economy and Competitiveness (Project CTQ2012-30703) and Science and Innovation (Project CIT-420000-2009-48), and EU for the FEDER resources.
ISSN: 0009-2509 (Print) | 1873-4405 (Online)
DOI: 10.1016/j.ces.2013.09.052
Language: eng
Type: info:eu-repo/semantics/article
Peer Review: si
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Appears in Collections:INV - MCMA - Artículos de Revistas

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