蜂窝状CuO/γ-Al_2O_3催化剂表征及其烟气脱硝性能研究  

Surface properties and flue gas denitrification performance of honeycomb CuO/γ-Al_2O_3 catalysts

作　　者：王学涛[1] 焦叶凡[1] 庄沙丽[1] 张兴宇[1] 

机构地区：[1]河南科技大学车辆与动力工程学院,河南洛阳471003

出　　处：《热力发电》2014年第2期30-35,共6页Thermal Power Generation

基　　金：国家自然科学基金项目(50806020);河南省科技创新人才计划(杰出青年)(114100510010)

摘　　要：通过浸渍法制备了CuO/γ-Al2O3系列催化剂,在模拟烟气脱硝试验装置上考察该催化剂的脱硝性能,并利用比表面积分析仪(BET)、X射线衍射(XRD)对催化剂进行了微观表征分析,研究了CuO的负载量、煅烧温度及CeO2对催化剂表面性能及催化剂脱硝活性的影响。结果表明:随着负载量的增加,CuO的衍射特征峰强度随之增加;CuO负载量对CuO/γ-Al2O3催化剂的表面结构有较大影响,随着CuO负载量的增加,试样的比表面积和孔体积均呈减小趋势,而平均孔径略微增大;CuO/γ-Al2O3催化剂的活性较高,对NO选择性催化还原较为适宜;CuO负载量为7.5%,煅烧温度为500℃时催化剂的NO转化率最高可达91.4%,加入CeO2可使催化剂的NO脱除效率达到94.5%。A series of CuO/γ-A12 03 catalysts were prepared by impregnation method. The denitrifi- cation property of the catalysts was investigated in a simulated flue gas denitrification experimen- tal device. The prepared samples were characterized by the BET specific surface area analyzer and X-ray diffraction （XRD）. The effect of CuO loading, calcined temperature, and promoter CeO2 on catalytic performance was investigated. The XRD results showed that the intensity of X-rays dif- fraction pattern of CuO wais enhanced with the CuO loading amount. The BET results indicated that the CuO loading amount had a great influence on surface structure of the CuO/γ-Alz 03 cata- lyst. With the increasing CuO loading amount, the specific surface area and pore volume samples showed a decrease tendency while the average pore size slightly increased. The CuO/γ-Alz 03 cata- lyst had higher catalytic activity, which was suitable to the selective catalytic reduction of NO. The catalyst calcined at 500 ℃ and loaded CuO with 7.5% had better catalysts morphology,and its denitrification efficiency can reach 91.4%. Addition of CeO2 can enhance the denitrification ef- ficiency to 94.50%.

关 键 词：烟气脱硝 催化剂 蜂窝载体 CUO γ—A1203 

分 类 号：TQ426[化学工程]