Journal
CATALYSIS SCIENCE & TECHNOLOGY
Volume 8, Issue 13, Pages 3336-3345Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8cy00709h
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Funding
- National Natural Science Foundation of China [51776113, 51776114]
- Natural Science Foundation of Shandong Province [ZR2017MEE035]
- Key R&D Program Funds of Shandong Province [2017GSF17122]
- Foundation of Shandong University for Young Scholar's Future Plan [2017WLJH29]
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Copper catalysts on Fe-loaded ceria were studied for NO reduction by CO. Catalysts with different Fe/Ce molar ratios (Cu/C1Fx) were synthesized by a wet impregnation method. Catalysts were characterized by XRD, BET, Raman, EPR, H-2-TPR and in situ DRIFTS. CuO was highly dispersed on the support surface to form active species. Ceria modification by incorporation of a lower amount of Fe3+ was beneficial for NO conversion and N-2 selectivity as compared with pure ceria and iron-rich ones, which resulted from the strong interaction between ceria and iron. Cu/C1F1 showed better catalytic performance at 100-200 degrees C, whereas Cu/C1F0.5 gave higher N-2 selectivity than the other samples. In situ DRIFTS suggested that iron-rich catalysts ensured inhibition of NO reduction by increasing the partial pressure of NO. Two mechanisms could explain formation of the NCO intermediate and N2O intermediate over ceria-rich catalysts. With an increase in the Fe/Ce molar ratio and temperature, a mechanism in which N2O is the intermediate dominates the reaction, whereas a process in which NCO species are produced as intermediates results in their gradual disappearance.
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