CuO/TiO_2/γ-Al_2O_3催化剂表征及对NO+CO反应性能研究(英文)  

Characterization and Catalytic Properties of CuO/TiO_2/γ-Al_2O_3 for NO+CO Reaction

作　　者：李惠娟[1] 蒋晓原[1] 张旭[1] 郑小明[1] 

机构地区：[1]浙江大学理学院化学系催化研究所,杭州310028

出　　处：《无机化学学报》2008年第6期848-855,共8页Chinese Journal of Inorganic Chemistry

基　　金：浙江省自然科学基金(No.Y504131)资助项目

摘　　要：采用色谱-微反流动法反应装置考察了w%CuO/15%TiO2/γ-Al2O3催化剂对NO+CO的反应活性;催化剂经空气氛或氢气氛预处理后,NO转化率达100%的反应温度分别是325和275℃;XRD仅能检测到γ-Al2O3晶相,负载15%CuO后可以检测到微弱的CuO晶相;H2-TPR能检测到2个CuO的还原峰(α和β峰),将其归属于高度分散的CuO分别在裸露的γ-Al2O3和TiO2/γ-Al2O3载体上的还原;原位红外分析结果表明催化剂经空气氛或氢气氛预处理后,吸附NO+CO反应气后,反应的中间产物N2O出现的温度分别为200和150℃。The catalytic activity and properties of w%CuO/15%TiO2/γ-Al2O3 in NO＋CO reaction were examined using a micro-reactor gas chromatography reaction system. When pretreated by air and H2, the catalysts had 100% NO conversion at 325 and 275 ℃, respectively. The XRD analysis could only detect γ-Al2O3 crystal diffraction and weak CuO crystal diffraction peaks after 15%CuO loading. There were two H2-TPR reduction peaks in CuO-TiO2/γ-Al2O3, the α peak due to the highly dispersed CuO which spread on γ-Al2O3 surface and the other peak due to the highly dispersed CuO which dispersed on 15%TiO2/γ-Al2O3 surface. The DRIFTS analysis showed that catalysts with pretreatment in air or H2 atmosphere adsorbed NO＋CO gases, and the N2O adsorption peaks appeared at 200 and 150 ℃,respectively.

关 键 词：CuO-TiO2/γ-Al2O3 NO+CO反应 NO+CO吸附 原位红外表征 

分 类 号：O614.41[理学—无机化学] O614.121[理学—化学]