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考察了富氧条件下Mn/ZSM-5催化剂上CH4选择催化还原NO反应,并采用H2程序升温还原、SO2程序升温表面反应和NO程序升温脱附等手段对催化剂进行了表征.结果表明,催化剂活性与制备方法和Mn负载量密切相关.离子交换法制备的Mn/ZSM-5催化剂活性明显优于浸渍法制备的催化剂;NO转化率随着Mn负载量的增加而增加,至2.06%时达到最大值(57.3%),然后随着Mn负载量的增加而降低.采用离子交换法或较低Mn负载量(≤2.06%)抑制了催化剂中非化学计量的MnOx(1.5

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