Optimizing the oxide support composition in Pr-doped CeO2 towards highly active and selective Ni-based CO2 methanation catalysts

Journal article (2022)

Authors

Anastasios I. Tsiotsias University of Western Macedonia
Nikolaos D. Charisiou University of Western Macedonia
Ayesha AlKhoori Khalifa University of Science and Technology
Safa Gaber Khalifa University of Science and Technology
Vlad Stolojan University of Surrey
Victor Sebastian Universidad de Zaragoza, Biomaterials and Nanomedicine (CIBER-BBN)
B. van der Linden ChemE/O&O groep - AS
Steven J. Hinder University of Surrey
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Research Group
ChemE/O&O groep (AS) (TU Delft)
Copyright: © 2022 Anastasios I. Tsiotsias, Nikolaos D. Charisiou, Ayesha AlKhoori, Safa Gaber, Vlad Stolojan, Victor Sebastian, B. van der Linden, Atul Bansode, Steven J. Hinder, More Authors
DOI: https://doi.org/10.1016/j.jechem.2022.04.003
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Published Date

2022

Language

English

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Faculty

Applied Sciences

Department

ChemE/Chemical Engineering

Research Group

ChemE/O&O groep

Abstract

In this study, Ni catalysts supported on Pr-doped CeO2 are studied for the CO2 methanation reaction and the effect of Pr doping on the physicochemical properties and the catalytic performance is thoroughly evaluated. It is shown, that Pr3+ ions can substitute Ce4+ ones in the support lattice, thereby introducing a high population of oxygen vacancies, which act as active sites for CO2 chemisorption. Pr doping can also act to reduce the crystallite size of metallic Ni, thus promoting the active metal dispersion. Catalytic performance evaluation evidences the promoting effect of low Pr loadings (5 at% and 10 at%) towards a higher catalytic activity and lower CO2 activation energy. On the other hand, higher Pr contents negate the positive effects on the catalytic activity by decreasing the oxygen vacancy population, thereby creating a volcano-type trend towards an optimum amount of aliovalent substitution.

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