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Improvement in Low Temperature CO Oxidation Activity of CuOx/CeO2−δ by Cs2O Doping: Mechanistic Aspects

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Abstract

The various wt% of Cs promoted CuOx/CeO2−δ catalysts were prepared by impregnation method and examined for CO oxidation. The 0.1 wt% Cs doped CuOx/CeO2−δ showed a maximum CO oxidation (22%) compared to the CuOx/CeO2−δ (9%) at light off temperature (40 ºC). The plausible CO oxidation mechanism has explained using characterization techniques like ATR-FTIR, XPS, XRD, SEM, H2-TPR, and HRTEM. The formation of Cs2O was responsible for the stabilization of Cu1+ species. The Cs doping increases the electron density on the catalyst surface due to the charge diffusion. The Cs addition in CuCe leads to the formation of smaller Cu1+ species, CuO nanorod, Ce3+ and adsorbed oxygen. The role of these species for CO oxidation at a lower temperature is explained in detail with plausible mechanism. The synergistic interaction of Cs with CuCe leads to the increase in CO conversion rate with decrease in the activation energy.

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 Acknowledgement

The SERB, DST, Delhi acknowledged for early career research award (ECR/2016/000823. CSIR-NCL, Pune and Prof. G. D. Yadav acknowledged for XPS and TPR characterization respectively.

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  1. Department of Chemistry, Institute of Chemical Technology, Matunga, 400019, Mumbai, India

    Jyoti Waikar, Nitin Lavande, Rahul More & Pavan More

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  1. Jyoti Waikar
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  2. Nitin Lavande
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  3. Rahul More
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  4. Pavan More
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Correspondence to Pavan More.

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Waikar, J., Lavande, N., More, R. et al. Improvement in Low Temperature CO Oxidation Activity of CuOx/CeO2−δ by Cs2O Doping: Mechanistic Aspects. Catal Surv Asia 24, 269–277 (2020). https://doi.org/10.1007/s10563-020-09310-8

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  • DOI: https://doi.org/10.1007/s10563-020-09310-8

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