Templated Synthesis of Pr-Doped Ceria with Improved Micro and Mesoporosity Porosity, Redox Properties and Catalytic Activity

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Title: Templated Synthesis of Pr-Doped Ceria with Improved Micro and Mesoporosity Porosity, Redox Properties and Catalytic Activity
Authors: Davó-Quiñonero, Arantxa | González Mira, Jorge | Lozano Castelló, Dolores | Bueno López, Agustín
Research Group/s: Materiales Carbonosos y Medio Ambiente
Center, Department or Service: Universidad de Alicante. Departamento de Química Inorgánica
Keywords: Template synthesis | Ceria | Oxidation catalyst | 3DOM | Microporous catalyst | Mesoporous catalyst
Knowledge Area: Química Inorgánica
Issue Date: Jan-2018
Publisher: Springer Science+Business Media, LLC
Citation: Catalysis Letters. 2018, 148(1): 258-266. doi:10.1007/s10562-017-2215-1
Abstract: A Ce0.9Pr0.1O2 catalyst has been prepared using nitrates as metal precursors, which have been infiltrated into a polymethylmethacrylate colloidal crystal template and calcined at 500 °C. Its catalytic activity for CO oxidation (4.3 μmolCO s−1 gcatalyst −1 at 300 °C) is far superior compared to a reference catalyst prepared in the same way but without the template (1.4 μmolCO s−1 gcatalyst −1 at 300 °C), and even superior to a three dimensionally ordered macroporous (3DOM) catalyst prepared forming metal citrates to obtain the macroporous structure into the template (0.7 μmolCO s−1 gcatalyst −1 at 300 °C). It is demonstrated that infiltration of nitrates into the colloidal crystal template is more positive for catalytic oxidation of CO than formation of the 3DOM structure using citrates, despite the collapse of the macroporous structure. The 3DOM catalyst prepared with citrates has lower surface area (51 m2 g−1) than catalysts prepared using nitrates (118 and 87 m2 g−1 for the infiltrated and non infiltrated catalysts, respectively). The infiltrated catalyst prepared with nitrates reaches the highest surface area, and also develops more micro and mesoporosity and presents smaller crystallite size (8 vs. 16 nm) than the counterpart non infiltrated catalyst. In addition, the population of oxygen vacancies is also much higher in the infiltrated catalyst prepared with nitrates, and it is postulated that this improves oxygen mobility into the mixed oxide lattice and favors the catalyst reduction. On the contrary, it has been ruled out any effect of the infiltration step in the insertion of Pr cations into the ceria lattice.
Sponsor: The authors thank the financial support of Generalitat Valenciana (Project PROMETEOII/2014/010), the Spanish Ministry of Economy and Competitiveness (Projects MAT2014-61992-EXP and CTQ2015-67597-C2-2-R), the Spanish Ministry of Education, Culture and Sports (Grant FPU14/01178) and the UE (FEDER funding).
URI: http://hdl.handle.net/10045/72639
ISSN: 1011-372X (Print) | 1572-879X (Online)
DOI: 10.1007/s10562-017-2215-1
Language: eng
Type: info:eu-repo/semantics/article
Rights: © Springer Science+Business Media, LLC 2017
Peer Review: si
Publisher version: http://dx.doi.org/10.1007/s10562-017-2215-1
Appears in Collections:INV - MCMA - Artículos de Revistas

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