A Route to Develop the Synergy Between CeO 2 and CuO for Low Temperature CO Oxidation
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A Route to Develop the Synergy Between CeO2 and CuO for Low Temperature CO Oxidation R. D. Kerkar1 · A. V. Salker1 Received: 10 December 2019 / Accepted: 3 March 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Highly active nano-composite oxide of cerium-copper was synthesized via physical grinding of respective metal oxides using mortar and pestle for the oxidation of carbon monoxide. The prepared oxides were characterized using X-ray diffraction (XRD), Thermal-gravimetric studies (TG), Infrared spectroscopy (IR), Scanning electron microscopy (SEM) and BET surface area. In addition, CO adsorption and surface reduction–oxidation property was studied through CO pulse titration, H 2-TPR and O2-TPO to understand their surface sensitivity towards it. Among the tested catalysts, synergy interaction produced between cerium and copper oxides after grinding them using mortar and pestle leads to an excellent CO to CO2 conversion. High CO chemisorption and an enhanced redox property are the evidence for the synergy exhibited by CeO2–CuO composite catalyst. The grinding route helped in improving the CO oxidation by decreasing the active temperature region for the reaction showed a good correlation with high CO adsorption and increased oxygen mobility at lower temperature gradient over CeO2–CuO composite. Further, good reaction stability was also seen with the addition of moisture in the reaction mixture.
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10562-020-03166-3) contains supplementary material, which is available to authorized users. * A. V. Salker [email protected] 1
School of Chemical Sciences, Goa University, Goa 403206, India
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R. D. Kerkar, A. V. Salker
Graphic Abstract
Keywords CeO2–CuO composite · CO chemisorption · Redox property · CO oxidation
1 Introduction Carbon monoxide (CO) is one of the toxic air pollutants originated along with others like NOx, HC, etc. due to incomplete combustion of the fuel used in automobiles and industrial processes. Exposure to CO is known to be very harmful and can cause many health and environment related issues. So, converting the CO to C O2 catalytically using catalytic convertor is a convenient way to eliminate carbon monoxide toxicity. In cold regions, maintaining high temperature in catalytic convertor is difficult, which is a major reason for decreasing its efficiency. Taking this into consideration, achieving the CO removal at a lower temperature is very much important. Different types of metal oxides such as Ce [1–3], Mn [4, 5], Cu [6], Fe [7], Co [8] are studied for CO oxidation, as they possess a good redox character.
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Similarly precious metals like Ag [9–12], Pd [8, 13] etc. with combination with other metals are also used for its effective performance and stability towards CO conversion. During the past several decades, cerium based catalyst were extensively studied for the catalytic oxidation of CO because of its high oxygen sto
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