Modulating Cu⁺ distribution on the surface of Ce-doped CuO composite oxides for SO₂-resistant NH₃-selective catalytic reduction of NO

Abstract

Ce dopping in CuO crystalline led to the distinguished existence and modulated distribution of Cu+ on the surface of samples, which was responsible for the outstanding SO2-resistant NH3-SCR-NO performance.

Copper-based non-precious metal heterogeneous catalysts for environmental remediation

“…The modulated distribution of Cu + achieved by adjusting the Ce/Cu molar ratio was found to be crucial for optimizing the redox ability and acid properties. Outstanding SO2-resistant NH3-SCR performance (NO conversion close to 100% in the temperature range 250-350 C under 200 ppm SO2) has been observed using (CeOx)0.25CuO as catalyst [93].…”

Efficiently Engineering Cu-Based Oxide by Surface Embedding of Ce for Selective Catalytic Reduction of NO with NH3

“…Moreover, it should be noted that the Ce-loading on our CeO x^C uO-EE samples was quite lower than that on reported Ce-Cu-contained composite catalysts, 21,[27][28][29]34,[37][38][39][40][41] for comparison, the detailed information of some typical samples was collected in Table 2. It can be found that although the Ce loading or Ce:Cu atomic ratio on our CeO x^C uO-EE samples was not more than one tenth of that on most reported Ce-Cu composited catalysts, the comparable or higher surface concentrations of Ce(III), Cu(I) and Os were obtained on our samples.…”

“…These results clearly indicated that CeO x^C uO-EE samples with Ce-embedded interactive surface were more competitive to achieve superior heterogeneous catalysis performance in comparison with conventional CeO x / CuO-kind samples. The factor being responsible for the superior activity of CeO x^C uO-EE samples could be mainly attributed to the Ce(IV)-Ce(III) and Cu(II)-Cu(I) co-present Ce-O-Cu interactive surface constructed from chemically embedding of Ce into the surface of Cu-based substrate, since the synergistic e®ect present by the transformation of CeðIVÞ þ CuðIÞ $ CeðIIIÞ þ CuðIIÞ during the catalytic cycle has been recognized the main factor to in°uence the surface chemical properties of Ce-O-Cu composited structures such as the acidic feature, the reactivity with reactants and the mobility of active oxygen species, 22,28,[37][38][39][40][41] in turn, these properties would greatly impact on reaction behaviors and govern catalytic performance. 16,45,46 In our case, by modulating and controlling the Ce dosage at 1.6 wt.% for preparing CeO x^C uO-EE structure, the comprehensive surface properties could be manipulated to the optimal level among samples (as disclosed in Table 1), which could be the clue to understand the superior catalytic performance of CeO x (1.6 wt.%)^CuO-EE.…”

Addition of Ce in Cu/Three‐Dimensional Graphene Derived from Watermelon for Low Temperature NH3‐SCR

“…Xing et al. prepared (CeO x ) m CuO composite oxides different from Ce/Cu molar ratios and found the conversion rate of NO is close to 100 % in 250–350 °C and has an outstanding SO 2 ‐resistance performance . Cu−CeO 2 /WO 3 ‐ZrO 2 ‐TiO 2 binary catalysts and the new type of Cu‐Ce−S nanocrystalline catalysts were prepared by Li et al.…”