Effects of the Fe/Ce ratio on the activity of CuO/CeO2–Fe2O3 catalysts for NO reduction by CO
作者： Xingyu Zhang , Xingxing Cheng , Chunyuan Ma , Zhiqiang Wang
DOI: 10.1039/C8CY00709H
关键词:
摘要: Copper catalysts on Fe-loaded ceria were studied for NO reduction by CO. Catalysts with different Fe/Ce molar ratios (Cu/C1Fx) synthesized a wet impregnation method. characterized XRD, BET, Raman, EPR, H2-TPR and in situ DRIFTS. CuO was highly dispersed the support surface to form active species. Ceria modification incorporation of lower amount Fe3+ beneficial conversion N2 selectivity as compared pure iron-rich ones, which resulted from strong interaction between iron. Cu/C1F1 showed better catalytic performance at 100–200 °C, whereas Cu/C1F0.5 gave higher than other samples. In DRIFTS suggested that ensured inhibition increasing partial pressure NO. Two mechanisms could explain formation NCO intermediate N2O over ceria-rich catalysts. With an increase ratio temperature, mechanism is dominates reaction, process species are produced intermediates results their gradual disappearance.
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