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Selective removal of CO from hydrocarbon-rich industrial off-gases over CeO2-supported metal oxides

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Abstract

For the selective removal of CO in the off-gas streams from real-life chemical processes, the interfacial interaction between the support and the active metal oxides and the role of active oxygen species are two fascinating problems. Herein, a series of CeO2-supported metal oxide catalysts were synthesized by co-precipitation method and employed for the selective removal of CO from the off-gas stream of propane oxidation process. CuO/CeO2 catalyst exhibits full CO conversion and 100% selectivity for CO removal in off-gas stream within a rather wide temperature window of 140–190 °C, being relatively stable in 200-h long-term time-on-stream experiment. Raman spectra, H2-TPR, CO-TPD and XPS spectra studies revealed that the redox properties and the concentration of active oxygen species varied with supported metal oxide compositions, for which CuO/CeO2 catalyst exhibited the highest surface oxygen vacancy concentration, good low-temperature reduction behavior and the highest adsorption capacity of CO, thus resulting in advanced CO removal performance. This study presents a strategy to design a promising CeO2-supported catalyst for oxidation removal of CO from off-gas of alkane oxidation process.

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Acknowledgements

We gratefully acknowledge the support of National Natural Science Foundation of China (Grant No. 21673227). And this work was also supported by the Dalian Science & Technology Innovation Fund (No. 2018J11CY015).

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Contributions

Wenling Chu supervised the experiments and reviewed the manuscript. Rui Cai provided the idea of CO removal from off-gas of alkane oxidation and reviewed the manuscript. Wenwen Yu carried out most of the experiments, including the preparation of catalysts and CO removal reaciton. Qi Zhou carried out most of the experiment and characterization suggested by the reviewers. HongKui Wang set up the apparatus of CO removal reaction. Yanchun Liu helped the students to carried out the experiments and characterization. Weishen Yang is our group leader.

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Correspondence to Wenling Chu or Rui Cai.

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Yu, W., Zhou, Q., Wang, H. et al. Selective removal of CO from hydrocarbon-rich industrial off-gases over CeO2-supported metal oxides. J Mater Sci 55, 2321–2332 (2020). https://doi.org/10.1007/s10853-019-04114-2

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  • DOI: https://doi.org/10.1007/s10853-019-04114-2

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