摘要
分别采用溶胶-凝胶法和浸渍法制备xCuO-yWO3/TiO2催化剂(x,y分别代表样品中ω(CuO)和ω(WO3)),并在微型固定床反应器中对制备的xCuO-yWO3/TiO2催化剂进行选择性催化还原脱硝(NH3-SCR)性能评价。结果表明:采用溶胶-凝胶法制备的2CuO-6WO3/TiO2催化剂具有较好的脱硝性能,在250~350℃,NOx转化率达到90%以上,相较于浸渍法制备的2CuO-6WO3/TiO2催化剂活性明显提高。并采用BET、XRD、H2-TPR、NH3-TPD和XPS等表征手段对制备的催化剂进一步表征分析,结果表明:通过溶胶-凝胶法制备2CuO-6WO3/TiO2催化剂的比表面积和表面化学吸附氧明显提高,且还原能力和酸性增强,对NH3的吸附能力亦有所提高,因此溶胶-凝胶法制备的2CuO-6WO3/TiO2催化剂表现出较好的NH3-SCR脱硝性能。
xCuO-yWO3/TiO2 catalysts(x and y represent the mass fraction of CuO and WO3 in the sample,respectively)were prepared by sol-gel method and impregnation method,respectively,and the SCR denitration performance(NH3-SCR)of the catalysts was evaluated in a miniature fixed-bed quartz reactor.It was found that the 2CuO-6WO3/TiO2 catalyst by the solgel method had good denitration performance,and made NOx conversion rate over 90%in temperature range of 250~350℃,which activity was improved significantly compared with 2CuO-6WO3/TiO2 catalyst by impregnation method.The prepared catalysts were characterized by BET,XRD,H2-TPR,NH3-TPD and XPS.The results showed that for the 2CuO-6WO3/TiO2 catalyst prepared by sol-gel method,the specific surface area,the surface adsorbed oxygen,the redox potential and adsorption capacity of NH3 increased significantly than the catalyst prepared by the impregnation method.Therefore,the 2CuO-6WO3/TiO2 catalyst prepared by sol-gel method exhibited excellent NH3-SCR activity and high N2 selectivity.
作者
刘海岩
李冬
苗雪
朱元元
刘小峰
吕莹
李杰
吴萍霞
彭悦
陈建军
李俊华
LIU Hai-yan;LI Dong;MIAO Xue;ZHU Yuan-yuan;LIU Xiao-feng;LV Ying;LI Jie;WU Ping-xia;PENG Yue;CHEN Jian-jun;LI Jun-hua(Tsinghua-Yancheng Environmental Engineering Technology Research and Development Center,Yancheng 224000,China;National Engineering Laboratory for Flue Gas Pollutants Control Technology and Equipment,Tsinghua University,Beijing 100084,China)
出处
《环境工程》
CAS
CSCD
北大核心
2020年第5期89-95,共7页
Environmental Engineering
基金
国家重点研发计划项目(2016YFC02092020,2018YFC0213400,2017YFC0210700)
国家自然科学基金项目(21876093)。
关键词
溶胶-凝胶法
浸渍法
脱硝催化剂
氧化铜
氧化钨
sol-gel method
impregnation method
de-NOx catalyst
coopper oxide
tungsten oxide
