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Promoter Effect of MAl2O4 (M = Co and Ni) Aluminates in the Performance of Pt/Al2O3 Catalyst for CO-PROX Reaction

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Abstract

In this study, the catalytic performance of Pt on alumina catalyst modified by adding MAl2O3 (Co and Ni) aluminates promoter has been tested for the preferential oxidation of CO in a H2-rich stream (CO-PROX). Activity and selectivity were superior compared to those of a reference Pt/alumina system, which requires higher temperatures (above 150 °C) to operate at reasonable rates. For all the modified catalysts, the maximum conversion occurs at 150 °C, a value within the acceptable working range for this process. Characterizations results indicate that the presence of aluminates oxides facilitated the electron transfer from Pt to promotes (caused by Pt and MAl2O4 close contact), resulting in the decrease of CO adsorption strength and the enhancement of low-temperature activity. The modified catalysts followed the dual-site Langmuir–Hinshelwood mechanism with CO preferentially adsorbing at the Pt sites and O2 adsorbing at the aluminates sites. Also, the excellent stability presented by modified catalysts after 30 h on stream at 200 °C demonstrates their high potential for practical CO-PROX applications.

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Acknowledgements

The authors gratefully thank CAPES (Coordenação de Aperfeiçoamento de Pessoal de Nível Superior), CNPq (Conselho Nacional de Desenvolvimento Científico) and FAPERJ (Fundação de Amparo à Pesquisa do Estado do Rio de Janeiro) for financial support. The authors would like to thank RECAT/UFF (Laboratório de Cinética, Catálise e Reatores Químicos da Universidade Federal Fluminense) by XPS analysis.

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  1. Chemical Engineering Program of COPPE, Federal University of Rio de Janeiro, P.O. BOX 68502, Rio de Janeiro, RJ, 21941-914, Brazil

    Martin Schmal

  2. Polytechnic School, University of São Paulo, São Paulo/SP, CEP, 05508-010, Brazil

    Martin Schmal

  3. School of Chemistry, Federal University of Rio de Janeiro, P.O. BOX 68542, Rio de Janeiro, RJ, 21941-909, Brazil

    Carlos Alberto Chagas

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Schmal, M., Chagas, C.A. Promoter Effect of MAl2O4 (M = Co and Ni) Aluminates in the Performance of Pt/Al2O3 Catalyst for CO-PROX Reaction. Catal Lett 153, 1826–1838 (2023). https://doi.org/10.1007/s10562-022-04128-7

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