Abstract
To develop active and stable catalysts for CO oxidation at relatively higher temperature region for exhaust treatment, ZnAl2O4 spinel promoted by Fe and Co have been fabricated and characterized by different means. While Fe doping improves only slightly the activity, Co doping increases the activity remarkably. XRD and Raman results have proved that ZnAl2O4 spinel is the major phase for all the samples. By Fe doping, a new ZnFe2O4 spinel compound is formed. By Co doping, two new ZnCo2O4 and CoAl2O4 spinels are generated, which can provide both surface Co3+ and Co2+ sites for effective CO adsorption. XPS and EPR have testified that surface superoxide O2- anion is the major active oxygen sites for the reaction. It is disclosed that the concerted interaction between surface O2- species and CO adsorption sites determines the activity. Compared with the un-modified Zn-Al spinel sample, Fe doping improves slightly the amount of active oxygen species, but decreases the amount of CO adsorption sites. However, Co doping increases the amount of both kinds of sites evidently due to the formation of ZnCo2O4 and CoAl2O4 spinels. As a consequence, Zn-Co-Al exhibits the optimal activity in all the catalysts.
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Acknowledgements
This work is supported by the Natural Science Foundation of China (21962009, 21567016, 21666020), the Natural Science Foundation of Jiangxi Province (20181ACB20005), Key Laboratory Foundation of Jiangxi Province for Environment and Energy Catalysis (20181BCD40004), which are greatly acknowledged by the authors.
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Sun, Y., Xu, J., Xi, R. et al. Unraveling the Intrinsic Reasons Promoting the Reactivity of ZnAl2O4 Spinel by Fe and Co for CO Oxidation. Catal Surv Asia 25, 180–191 (2021). https://doi.org/10.1007/s10563-021-09324-w
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DOI: https://doi.org/10.1007/s10563-021-09324-w