Issue 21, 2017

Adsorption of C2 gases over CeO2-based catalysts: synergism of cationic sites and anionic vacancies

Abstract

The synthesis of novel and efficient catalysts for acetylene hydrogenation exhibiting high selectivity towards ethylene is important due to the presence of selective acetylene hydrogenation reaction in petrochemical processing. Since adsorption of C2 gases constitutes the primary step in catalytic hydrogenation and governs the selectivity of the catalysts, we have explored the C2-adsorption potential of reducible CeO2-based systems. The adsorption of C2-gases over CeO2-based materials was assessed using experimental in situ spectroscopic techniques and in silico theoretical studies based on density functional theory. The effect of Pd2+ substitution on adsorption was studied. The addition of Pd2+-ions was found to enhance the adsorption of the gases. Theoretical calculations provided insights into the modes of adsorption, adsorption energetics and reactant–catalyst interactions. The role of the presence of cationic substitution and anionic vacancies in strengthening the adsorption of gases was established. Pd-substituted reduced CeO2 showed activity for the adsorption of all C2 gases. On the basis of the aforementioned experimental and theoretical observations, the catalysts were tested for acetylene hydrogenation, and Pd-substituted CeO2 was found to be a good catalyst for the reaction with complete acetylene conversion observed below 100 °C.

Graphical abstract: Adsorption of C2 gases over CeO2-based catalysts: synergism of cationic sites and anionic vacancies

Supplementary files

Article information

Article type
Paper
Submitted
23 Feb 2017
Accepted
03 May 2017
First published
05 May 2017

Phys. Chem. Chem. Phys., 2017,19, 14148-14159

Adsorption of C2 gases over CeO2-based catalysts: synergism of cationic sites and anionic vacancies

M. C. Padole, B. P. Gangwar, A. Pandey, A. Singhal, S. Sharma and P. A. Deshpande, Phys. Chem. Chem. Phys., 2017, 19, 14148 DOI: 10.1039/C7CP01207A

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