Citation: ZHU Jie, GE Feng-Juan. CuO/CeO2/γ-Al2O3 Catalysts: Effect of Pretreating Atmosphere on Surface Properties and Catalytic Performance in Selective Catalytic Reduction of NO with CO[J]. Chinese Journal of Inorganic Chemistry, ;2015, (1): 191-197. doi: 10.11862/CJIC.2015.021
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The CeO2/γ-Al2O3 supports were prepared and pretreated in different atmospheres to adjust the valence state of surface Ce element, then Cu(CH3COO)2 was impregnated as the precursor to prepare CuCeAl samples. XRD and H2-TPR results indicate that the CeO2/γ-Al2O3 support pretreated by reducing atmosphere has more active oxygen atoms, consequently has more dispersed Cu2+/Cu+ species on the surface. The "NO+CO" reaction tests reveal that the dispersed Cu2+/Cu+ are the active species for NO conversion, while crystalline Cu0 promotes the N2 selectivity at low temperatures. Hence, the catalysts containing both dispersed Cu2+/Cu+ and a few crystalline Cu0 have the optimal catalytic efficiency.
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