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膨胀石墨(EG)具有四级孔结构,是一种优良的吸附剂和催化剂载体。采用超声浸渍法制备了Mn/EG催化剂,用于低温催化氧化NO,考察了金属负载量、进口NO质量浓度及O2体积分数对NO氧化效率的影响。结果表明,利用超声浸渍法制备得到的Mn/EG催化剂低温催化氧化活性较好,且催化剂表面的3价Mn对反应活性有重要影响。进口气体中O2体积分数对反应活性有明显的影响,低温时高体积分数的氧能促进NO的转化。150℃时,在NO体积分数为0.05%、O2体积分数为3%、空速为47 770 h-1的条件下,该催化剂的NO催化氧化效率可达42%。
Expanded graphite (EG) has a four-stage pore structure and is an excellent adsorbent and catalyst support. The Mn / EG catalyst was prepared by ultrasonic impregnation for the catalytic oxidation of NO at low temperature. The effects of metal loading, inlet NO concentration and O2 volume fraction on NO oxidation efficiency were investigated. The results show that the Mn / EG catalyst prepared by ultrasonic impregnation has good catalytic activity at low temperature and the trivalent Mn on the catalyst surface has an important influence on the reactivity. The volume fraction of O2 in the inlet gas has a significant effect on the reactivity, and the high volume fraction of oxygen at low temperature can promote the conversion of NO. Under the condition of 150 ℃, the NO catalytic oxidation efficiency of the catalyst is up to 42% under the condition of NO volume fraction of 0.05%, O2 volume fraction of 3% and space velocity of 47 770 h-1.