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OALib Journal期刊
ISSN: 2333-9721
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mn/ce-zro2催化剂低温nh3-scr脱硝性能研究
, PP. 123-128
Keywords: 低温选择性催化还原(scr),mnox,so2,no
Abstract:
？采用浸渍法制备了三种具有不同载体的锰基nh3低温选择性催化还原(nh3-scr)催化剂mn/ce-zro2、mn/p25和mn/al2o3。研究了三种催化剂低温scr脱硝活性及抗h2o、抗so2性能,并采用xrd、nh3-tpd和h2-tpr手段对催化剂的物理化学性质进行表征。结果表明,在无h2o和so2存在的情况下,三种催化剂的低温scr催化活性均比较高。相对来说,mn/ce-zro2在低温段(100~160℃)活性更高,mn/p25在高温段(160~220℃)活性更高,这与两种催化剂的氧化还原性质有关。h2-tpr表征表明,mn/ce-zro2更容易发生氧化还原反应,而mn/p25还原峰对应的温度较高、面积较大。三种催化剂均有很高的低温抗水性能。另外,mn/ce-zro2的抗h2o、抗so2性能最好,而mn/p25的抗h2o、抗so2性能最差。mn/ce-zro2具有较好的抗h2o、抗so2性能是由于其具有较多的表面酸位点,且表面生成的硫铵盐不稳定。
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