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以氨水或碳酸氢铵为沉淀剂,共沉淀法制备了Ce和Mn以不同取代量的复合氧化物催化剂CeMnxAl12-xO19-δ(x=0,1,2,3),用于低浓度CH4催化燃烧.在微型固定床反应器上测试了CH4催化燃烧的转化率.应用XRD分析了复合氧化物的相组成,气体分析仪表征了复合氧化物的比表面积和孔径分布.结果表明:以NH4HCO3为沉淀剂制备的CeMnAl11O19-δ催化剂具有较大的比表面积,为4.102m2/g;随着Mn取代量的增加,催化剂的比表面积降低;在Mn取代量x=2时,CH4催化燃烧反应活性最高,相应的起燃温度T10为445℃.
CeMnxAl12-xO19-δ (x = 0, 1, 2, 3) catalysts were prepared by coprecipitation method using ammonia or ammonium bicarbonate as precipitants and Ce- The conversion of CH4 catalytic combustion was measured on a miniature fixed bed reactor.The phase composition of the composite oxide was analyzed by XRD and the specific surface area and pore size distribution of the composite oxide were characterized by gas analyzer.The results showed that: The specific surface area of CeMnAl11O19-δcatalyst prepared by the precipitant has a large specific surface area of4.102m2 / g. The specific surface area of the catalyst decreases with the increase of the Mn substitution amount. The catalytic activity of CH4catalyst is the highest when the substitutional amount of Mn is2 , The corresponding light-off temperature T10 is 445 ℃.