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Appl. Sci. 2014, 4(3), 468-481; doi:10.3390/app4030468

Effect of RhOx/CeO2 Calcination on Metal-Support Interaction and Catalytic Activity for N2O Decomposition

Department of Inorganic Chemistry, University of Alicante, Ap.99, E-03080 Alicante, Spain
These authors contributed equally to this work.
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Received: 22 August 2014 / Revised: 10 September 2014 / Accepted: 10 September 2014 / Published: 22 September 2014
(This article belongs to the Special Issue Feature Papers)
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Abstract

The effect of the calcination conditions on the catalytic activity for N2O decomposition of 2.5% RhOx/CeO2 catalysts has been investigated. Ramp and flash calcinations have been studied (starting calcinations at 25 or 250/350 °C, respectively) both for cerium nitrate and ceria-impregnated rhodium nitrate decomposition. The cerium nitrate calcination ramp has neither an effect on the physico-chemical properties of ceria, observed by XRD, Raman spectroscopy and N2 adsorption, nor an effect on the catalysts performance for N2O decomposition. On the contrary, flash calcination of rhodium nitrate improved the catalytic activity for N2O decomposition. This is attributed to the smaller size of RhOx nanoparticles obtained (smaller than 1 nm) which allow a higher rhodium oxide-ceria interface, favoring the reducibility of the ceria surface and stabilizing the RhOx species under reaction conditions. View Full-Text
Keywords: N2O decomposition; Rh; ceria; Rh-ceria interaction; nanoparticles; subnanoparticles; nitric acid plant; ceria catalyst N2O decomposition; Rh; ceria; Rh-ceria interaction; nanoparticles; subnanoparticles; nitric acid plant; ceria catalyst
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MDPI and ACS Style

Rico-Pérez, V.; Bueno-López, A. Effect of RhOx/CeO2 Calcination on Metal-Support Interaction and Catalytic Activity for N2O Decomposition. Appl. Sci. 2014, 4, 468-481.

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