Abstract:Microwave was used to hydrothermally treat the precursors of iron-cerium-titanium mixed oxide catalysts prepared by co-precipitation.The optimization of microwave hydrothermal treatment on the low-temperature NH3-SCR activity over iron-based catalyst were investigated in a fixed-bed quartz tube reactor,and the influences of microwave hydrothermal treatment conditions were also studied through the orthogonal experiment.The results indicated that microwave hydrothermal treatment could improved the low-temperature NH3-SCR activity of iron-based catalyst,and made its reactive SCR temperature window shift to the low-temperature region.Meanwhile,the promotional effect of microwave hydrothermal treatment on low-temperature NH3-SCR activity is closely related to the molar ratio of Fe and Ti in the mixed oxide catalyst.When the molar ratio of Fe and Ti is smaller,the promotion of microwave hydrothermal treatment is higher.The microwave heating method and the microwave radiation time played an important role on the promotion of low-temperature NH3-SCR activity over iron-based catalyst.Under the same microwave radiation time,when the microwave heating method was changed from P30to P80,the promotion of microwave hydrothermal treatment on low-temperature NH3-SCR activity over iron-based catalyst gradually decreased.Under the condition of P30,iron-based catalyst showed the highest NH3-SCR activity after being treated by microwave radiation for 15min.
熊志波, 金晶, 路春美, 郭东旭, 张信莉. 铁基催化剂的微波水热处理对其SCR脱硝性能的影响[J]. 中国环境科学, 2014, 34(7): 1785-1789.
XIONG Zhi-Bo, JIN Jing, LU Chun-Mei, GUO Dong-Xu, ZHANG Xin-Li. Effect of microwave hydrothermal treatment for iron-based catalyst on its selective catalytic reduction of NO with NH3. CHINA ENVIRONMENTAL SCIENCECE, 2014, 34(7): 1785-1789.