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MnCeOx@MgO催化剂上同步脱除NOx和氯苯的研究
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Abstract:
采用水热法和共沉淀法分别制备了MnCeOx@MgO核壳催化剂和MnCeMgOx复合金属氧化物催化剂，通过催化活性评价和催化表征考察了MnCeOx@MgO催化剂和MnCeMgOx复合金属催化剂上同步脱除氮氧化物(NOx)和氯苯(CB)的构效关系。活性测试结果表明，MnCeOx@MgO核壳催化剂的催化活性强于MnCeMgOx复合金属氧化物催化剂，且MnCeOx@MgO核壳催化剂具有更宽的活性温度窗口。其中NOx和CB在MnCeOx@MgO核壳催化剂上的转化率分别在250℃和350℃达到77%和84%，NOx和CB在MnCeMgOx复合金属催化剂的转化效率分别为62.6% (200℃)和89% (350℃)。MnCeOx@MgO催化剂的活性与其物化结构、表面活性氧物种比值和过渡金属活性组分的形态有关。MnCeOx@MgO核壳催化剂的平均孔径和Olatt/Oads比值均大于MnCeMgOx复合金属催化剂，与催化活性成正相关。催化剂中活性组分分别为Mn2+、Mn3+、Mn4+、Ce3+。
MnCeOx@MgO core-shell catalyst and MnCeMgOx composite catalyst were prepared by hydrothermal method and coprecipitation method, respectively. Structure-activity relationship in simultaneous removal of NOx and chlorobenzene (CB) on MnCeOx@MgO and MnCeMgOx catalysts was investigated by catalytic activity test and characterization. The results show that the activity of MnCe-Ox@MgO catalyst is higher than that of MnCeMgOx catalyst. For MnCeOx@MgO core-shell catalyst, the conversion of NOx and CB was 77% and 84% at 250？C and 350？C, respectively. For MnCeMgOx composite catalyst, the conversion of NOx and CB was 62.6% and 89% at 200？C and 350？C, respectively. The activity of MnCeOx@MgO catalyst is related to its physicochemical structure, surface active oxygen species ratio and the morphology of transition metal active components. Both average pore size and Olatt/Oads ratio of MnCeOx@MgO catalysts are higher than those of MnCeMgOx catalysts, which were positively correlated with the catalytic activity. The active components in MnCeOx@MgO catalyst are Mn2+, Mn3+, Mn4+, Ce3+ respectively.
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