摘要
以金属有机骨架为牺牲模板制备了一系列MnO_(x)催化剂,考察了焙烧温度对催化剂脱硝性能的影响,并利用多种手段对催化剂的表面结构和物化性质进行分析表征。结果表明:随着焙烧温度的升高,Mn_(3)O_(4)的结晶度提高,但不利于活性组分的分散;MnO_(x)催化剂的比表面积和孔体积变小,孔径增大;MnO_(x)催化剂具有的弱酸性位点减少,氧化还原性能变差,进而使催化剂的低温脱硝活性变差。活性评价结果表明,300℃焙烧的MnO_(x)催化剂具有最佳的低温活性,在体积空速为20000 h^(-1)的条件下,反应温度为120~200℃时,NO转化率达90%以上。
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 Mn_(3)O_(4) 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 20000 h^(-1).
作者
梁海龙
吴彦霞
陈玉峰
胡利明
王春朋
Liang Hailong;Wu Yanxia;Chen Yufeng;Hu Liming;Wang Chunpeng(Ceramics Science Institute,China Building Materials Academy,Beijing 100024)
出处
《石油炼制与化工》
CAS
CSCD
北大核心
2022年第9期78-82,共5页
Petroleum Processing and Petrochemicals
基金
国家重点研发计划资助项目(2016YFC0209302)。
关键词
选择性催化还原
催化剂
一氧化氮
焙烧温度
脱硝
selective catalytic reduction
catalyst
NO
calcination temperature
denitration
