CuO/CeO2–MnO2 Catalyst Prepared by Redox Method for Preferential Oxidation of CO in H2-Rich Gases
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CuO/CeO2–MnO2 (CuCeMn-4) catalyst was prepared by redox method and was tested in the CO preferential oxidation in H2-rich gases (CO PROX). CuO/CeO2–Mn2O3 (CuCeMn-3) catalyst was prepared and tested for comparison. CuCeMn-4 exhibits higher catalytic activity than CuCeMn-3. The complete CO conversion with CO2 selectivity of 92% can be obtained at 120 °C over CuCeMn-4. The catalysts were characterized by means of N2 adsorption/desorption, XRD, H2-TPR and XPS techniques. The results show that the interaction between MnO2 and CeO2 in catalyst is stronger than Mn2O3 and CeO2, which can promote the mobility of oxygen species from CeO2–MnO2 to active copper species. XPS characterization further revealed that CuCeMn-4 contains richer lattice oxygen, higher amount of Cu+ species and less carbonate species on the surface as compared with CuCeMn-3. All these should be greatly responsible for the high activity of CuCeMn-4 catalyst.
KeywordsCuO/CeO2–MnO2 catalyst Redox method CO preferential oxidation
We gratefully acknowledge the financial support from the National Natural Science Foundation of China (21563014, 21403093), Foundation of Jiangxi Education Committee (GJJ160411) and Natural Science Foundation of Jiangxi Province (20142BAB203014).
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Conflict of interest
On behalf of all authors, the corresponding author states that there is no conflict of interest.