Key‐lock Ceria Catalysts for the Control of Diesel Engine Soot Particulate Emissions

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Title: Key‐lock Ceria Catalysts for the Control of Diesel Engine Soot Particulate Emissions
Authors: Sorolla-Rosario, Débora | Davó-Quiñonero, Arantxa | Bailón-García, Esther | Lozano-Castello, Dolores | Bueno López, Agustín
Research Group/s: Materiales Carbonosos y Medio Ambiente
Center, Department or Service: Universidad de Alicante. Departamento de Química Inorgánica
Keywords: Key–lock catalysts | Soot | Diesel | 3DOM | Ceria
Knowledge Area: Química Inorgánica
Issue Date: 19-Mar-2020
Publisher: Wiley-VCH Verlag GmbH & Co. KGaA
Citation: ChemCatChem. 2020, 12(6): 1772-1781. doi:10.1002/cctc.201902177
Abstract: A new concept, referred to as key‐lock catalyst, is presented in this article. Soot combustion ceria catalysts were prepared combining hard (polymethylmethacrylate colloidal crystals) and soft (Pluronic F127) templates, tuning the porosity of ceria in different size ranges to match the morphology of soot aggregates. The catalysts porosity was characterized in detail by N2 adsorption‐desorption isotherms and Hg‐porosimetry. XRD and H2‐TPR characterization ruled out that differences in activity are related neither with crystallographic nor with redox properties. As a proof of key‐lock catalyst concept, an optimum key‐lock ceria catalyst was synthesized by combining large macropores (100–300 nm) with mesopores (10–30 nm), because they fit to the large soot aggregates and to primary soot particles sizes, respectively. The best soot combustion activity of the optimum key‐lock catalyst is attributed to the optimum transfer of ceria active oxygen from catalyst to soot. The catalytic results confirmed that all ceria catalysts prepared with different porosity oxidize NO to NO2 at the same rate, and the NO2‐assisted soot combustion pathway is not affected by tuning ceria porosity. This double‐templated synthesis and the key‐lock concept opens a new synthesis approach to design noble‐metal free soot combustion catalysts based on the highly effective active oxygen mechanism.
Sponsor: The authors thank the financial support of the Spanish Ministry of Economy and Competitiveness (Project CTQ2015-67597-C2-2-R and grant FJCI-2015-23769), the Spanish Ministry of Education, Culture and Sports (grant FPU14/01178), Generalitat Valenciana (Project PROMETEO/2018/076 and APOSTD/2019/030), the Spanish Society of Catalysis (SECAT-“initiation for research in catalysis”) and the UE (FEDER funding).
URI: http://hdl.handle.net/10045/104612
ISSN: 1867-3880 (Print) | 1867-3899 (Online)
DOI: 10.1002/cctc.201902177
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2020 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
Peer Review: si
Publisher version: https://doi.org/10.1002/cctc.201902177
Appears in Collections:INV - MCMA - Artículos de Revistas

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