Cu/CeO 2 as efficient low-temperature CO oxidation catalysts: effects of morphological structure and Cu content
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Cu/CeO2 as efficient low‑temperature CO oxidation catalysts: effects of morphological structure and Cu content Chunlei Wu1 · Zengzeng Guo1 · Xiaoyu Chen1 · Hong Liu1 Received: 7 July 2020 / Accepted: 16 September 2020 © Akadémiai Kiadó, Budapest, Hungary 2020
Abstract Cu loaded on different morphologies of C eO2 were synthesized and tested by SEM and CO catalytic oxidation experiment, the results indicated that with the same Cu load, nanorod-like Cu/CeO2 performed the best catalytic activity than 3D flower-like Cu/CeO2 and gear-like Cu/CeO2. Then nanorod-like Cu/CeO2 were chose to explore the best Cu load on CeO2 nanorods for CO oxidation. Cu/CeO2 nanorods were characterized by TEM, XRD, XPS as well as physical and chemical adsorption. The results indicate that 0.15Cu/CeO2 nanorods have the best catalytic activity because of more reducing copper species (Cu+), adsorbed oxygen (Oads) and Ce3+ species on the catalysts surface, which can achieve 99% CO conversion at 100 °C. The effect of CO2 and water vapor on catalytic activity was also examined. Keywords Cu/CeO2 nanorods · Morphology · CO catalytic oxidation · Low temperature oxidation · Optimal load
Introduction Air pollution caused by automobile exhaust, waste gas of coal mines and incomplete combustion of hydrocarbons becomes increasingly serious nowadays [1]. The air pollutants include S O2, NOx, CO and suspended particulate matter. Among these, CO is the most dangerous one because its affinity with hemoglobin is over 200 times than oxygen [2], thus easily causes human death. Hence, the elimination of CO is of great significance for protecting the environment and human health.
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s1114 4-020-01870-0) contains supplementary material, which is available to authorized users. * Xiaoyu Chen [email protected] 1
Jiangsu Key Laboratory of Fire Safety in Urban Underground Space, China University of Mining and Technology, Xuzhou 221116, Jiangsu, People’s Republic of China
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Reaction Kinetics, Mechanisms and Catalysis
Recently, catalytic oxidation method is widely employed for CO elimination due to its high conversion and environmentally friendliness. Catalysts commonly used for CO catalytic oxidation include noble metal catalysts and non-noble metal catalysts [3, 4]. Although noble metal catalysts have good catalytic performance, the disadvantages of their high cost, high sintering temperature and low poison tolerance restrain their application [5, 6]. Non-noble metal catalysts have become promising catalysts because of their low cost and potential applications in various fields. Among non-noble metal catalysts, CeO2 has attracted much attention due to its excellent oxygen storage capacity (OSC), inherent C e3+/Ce4+ redox electron pair and rich oxygen vacancy [7–9]. Although a large amount of research has been devoted to the preparation of cerium-based catalysts, a challenging problem which arises is that CO cannot be completely ox
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