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采用柠檬酸法制备了不同Fe和Mn含量的Fe-Mn/HBeta催化剂,采用BET、XRD、SEM和XPS等方法对不同催化剂的特征参数进行表征,以氨气为还原剂,在空速为5 000 h~(-1)的条件下,考察了活性成分负载量和焙烧温度对其活性的影响;探讨了催化剂的抗水抗硫性能。研究结果表明,焙烧温度为550℃、6%Fe-6%Mn/HBeta催化剂具有相对较优的催化活性,反应温度为90~230℃时,NO转化率为63.9%~96.99%,比表面积、孔体积和平均孔径分别为356.19 m~2/g、0.61cm~3/g和16.83 nm,活性成分在催化剂表面高度分散,催化剂表面Mn主要以Mn~(3+)和Mn~(4+)存在,且以Mn~(4+)居多;反应温度为180℃条件下,6%Fe-6%Mn/HBeta催化剂具有较好的抗水能力和同时抗水抗SO_2能力,但单独抗SO_2能力较差。
The Fe-Mn / HBeta catalysts with different contents of Fe and Mn were prepared by citric acid method. The characteristic parameters of different catalysts were characterized by BET, XRD, SEM and XPS. Ammonia was used as reducing agent, 000 h ~ (-1) under the conditions of the active ingredient loading and calcination temperature on its activity; discussed the water and sulfur resistance of the catalyst. The results show that the 6% Fe-6% Mn / HBeta catalyst has a relatively good catalytic activity at a calcination temperature of 550 ℃. When the reaction temperature is 90 ~ 230 ℃, the NO conversion is 63.9% ~ 96.99%. The specific surface area, The pore volume and the average pore size were 356.19 m 2 / g, 0.61 cm -3 / g and 16.83 nm, respectively. The active components were highly dispersed on the catalyst surface. The main surface Mn of the catalyst was Mn 3+ and Mn 4+. 6 + Fe-6% Mn / HBeta catalyst has better water-resistance ability and anti-SO2-resistance ability at the reaction temperature of 180 ℃. However, the anti-SO_2 capacity alone Poor.