Fe-Mn/H-BEA催化剂上甲烷催化还原NO_x的动力学研究  

Kinetics of NOx Reduction by CH4 on Fe-Mn/H-Beta Catalyst

作　　者：谭淑宁 潘华 赵子龙 王莉[1] 

机构地区：[1]浙江树人大学,生物与环境工程学院,浙江 杭州

出　　处：《化学工程与技术》2020年第3期138-145,共8页Hans Journal of Chemical Engineering and Technology

基　　金：浙江省自然科学基金(LY19E080023);浙江树人大学省属高校基本科研业务费专项资金项目资助(2020XZ012)。

摘　　要：Fe-Mn/H-BEA催化剂上甲烷催化还原NOx的动力学研究表明,脱硝催化反应为NOx的拟一级反应,在350℃和400℃时,脱硝反应速率的NO反应级数分别为0.91和0.95。O2的反应级数为0.21~0.31,当温度范围在300℃至450℃时,脱硝催化反应与甲烷和二氧化碳的浓度无关,即主要以NOx催化分解为主。NO氧化是催化反应的限速步骤。Fe-Mn/H-BEA催化剂上甲烷催化还原NOx反应包括2个途径:一个是NOx的催化分解(主反应),另一个是甲烷催化还原NOx(CH4-SCR)。Kinetic of catalytic reduction of NOx with methane over Fe-Mn/H-BEA catalyst reveals that the catalytic reaction is first order and 0.21 - 0.31 order with respect to NOx and oxygen, respec-tively. At 350?C and 400?C, the NO reaction order of de-NOx rate is 0.91 and 0.95, respectively. The catalytic reaction is almost independent to the presence of methane and CO2 at tempera-tures ranging from 300?C to 450?C. It means that catalytic decomposition of NOx is the dominant reaction. NO oxidation is the rate-limiting step. DeNOx catalysis by methane over Fe-Mn/H-beta comprises two reactions: one is catalytic decomposition of NOx (the dominant reaction), and the other is NOx reduction by methane (CH4-SCR).

关 键 词：催化脱硝 动力学参数 反应机理 Fe-Mn/H-BEA 

分 类 号：O64[理学—物理化学]