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OALib Journal期刊
ISSN: 2333-9721
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al-pilc负载铜铁复合氧化物在nh3选择性催化还原no中的协同作用
, PP. 1102-1110
Keywords: 选择性还原,脱硝,铝柱撑黏土,铜铁复合催化剂,协同作用
Abstract:
？以铝柱撑黏土（al-pilc）为载体采用旋蒸-浸渍法制备了铜、铁单组分催化剂（cu/al-pilc、fe/al-pilc）和铜铁复合氧化物催化剂（cufe/al-pilc），并测试其对nh3选择性催化还原no反应（nh3-scr）的催化性能。相比cu/al-pilc和fe/al-pilc，cufe/al-pilc活性组分之间有较强的协同效应，显著提高了催化剂的脱硝性能。cufe/al-pilc在290~450℃的宽温区no脱除效率保持90%以上，最高可达97%。此外，cufe/al-pilc有很好的抗水抗硫性能，催化活性不受反应气氛中水蒸气和so2的影响。xrd、uv-vis、xps和n2吸附脱附表征结果表明，cufe/al-pilc中活性组分相互作用生成cufe2o4，有利于活性组分在载体表面分散，提高催化剂的比表面积和孔容；h2-tpr表征结果表明，cufe/al-pilc活性组分在载体表面生成的cufe2o4改善了催化剂氧化还原性能，有利于nh3对no选择性的还原；nh3-tpd表征结果表明，cufe/al-pilc在较宽温区范围内对nh3都有很好的吸附，这有利于提高催化剂表面还原物种的浓度，从而保证催化剂在较宽温区范围内具有较好的no脱除效率。
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