关键词: 选择性催化还原, 催化剂, 一氧化氮, 焙烧温度, 脱硝

Abstract: A series of MnO_x catalysts were prepared by using metal organic framework as sacrificial template, and the effect of calcination temperature on the denitrification performance of the catalysts was investigated. The surface structure and physicochemical properties of the catalysts were analyzed by a variety of characterization methods. The results showed that with the increase of calcination temperature, the crystallinity of Mn₃O₄ was improved, but it was unfavorable to the dispersion of active components; the specific surface area and pore volume of MnO_x catalyst were decreased and the pore size was increased ; the weak acid sites of MnO_x were decreased, the oxidation-reduction performance and denitrification activity of the catalyst at low temperature became worse. The results of activity evaluation showed that the MnO_x catalyst calcined at 300 ℃ had the best activity at low temperature. The NO conversion was over 90% at the reaction temperature of 120-200 ℃ and the space velocity of 20 000 h^-1.

Key words: selective catalytic reduction, catalyst, NO, calcination temperature, denitration