Abstract
In this study, the widely studied MnCe (MnOx–CeO2) catalyst prepared by the co-precipitation method was used for investigating the effects of oxygen in the calcination atmosphere (referred as Oca) on its catalytic performance for NO oxidation. The evaluation of catalytic performance showed that MnCe-O (calcined in O2/Ar) exhibited a much lower NO conversion in comparison with MnCe-A (calcined in Ar) catalyst. The characterization results revealed that Oca could cause the sintering of MnCe catalysts and then reduce the surface area, which decreased the active sites for catalytic reaction. Simultaneously, Oca inhibited the incorporation of Mn ions into CeO2 lattice, which could weaken the interaction between MnOx and CeO2 supports. This weak interaction decreased the amounts of active oxygen species and weakened the redox properties of MnCe catalyst. Furthermore, the nitrate species adsorbed on MnCe-O was more stable than that on MnCe-A. Therefore, the inferior catalytic performance of MnCe-O could be attributed to the collective effect of low concentration active sites and active oxygen species, poor redox properties and stable adsorbed nitrate species.
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Acknowledgements
This work was financially supported by the Key Project of Chinese National Programs for Research and Development (2016YFC0203800), the National Natural Science Foundation of China (51408309 and 51578288), Science and Technology Support Program of Jiangsu Province (BE2014713), Natural Science Foundation of Jiangsu Province (BK20140777), Industry-Academia Cooperation Innovation Fund Projects of Jiangsu Province (BY2016004-09), Jiangsu Province Scientific and Technological Achievements into a Special Fund Project (BA2015062 and BA2016055), Top-notch Academic Programs Project of Jiangsu Higher Education Institutions, Industry-Academia Cooperation Project of Datang Pro-environment (DNEPT_CZ_179_16).
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Yiqing Zeng and Dong Jiang contributed equally to this work.
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Zeng, Y., Jiang, D., Wang, Y. et al. The inhibition effect of oxygen in the calcination atmosphere on the catalytic performance of MnOx–CeO2 catalysts for NO oxidation. Reac Kinet Mech Cat 122, 593–604 (2017). https://doi.org/10.1007/s11144-017-1234-7
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DOI: https://doi.org/10.1007/s11144-017-1234-7