摘要
采用共沉淀法制备TiO_2-SnO_2固溶体,浸渍法负载WO_3和V_2O_5得到一系列V_2O_5-(x%)WO_3/TiO_2-SnO_2脱硝催化剂。利用比表面积测定(BET)、X射线衍射(XRD)、原位漫反射傅里叶变换红外光谱(in situ DRIFTS)、程序升温脱附(NH_3-TPD)、高分辨率透射电子显微镜(HRTEM)等表征技术,结合脱硝性能测试,研究催化剂的表面特性、微观结构及脱硝活性。结果表明:V_2O_5-12%WO_3/TiO_2-SnO_2催化剂在250~400℃的温度窗口具有95%的NO_x转换率;随着WO_3负载量增加,催化剂比表面积有所减小;WO_3以无定形态存在于催化剂表面;催化剂表面Br?nsted酸中心强度随WO_3负载量增加逐渐增大,这是V_2O_5-(12%)WO_3/TiO_2-SnO_2催化剂具有最佳脱硝活性的主要原因。
TiO_2-SnO_2 solid solution was prepared by a co-precipitation method and V_2O_5-（x%）WO_3/ TiO_2-SnO_2 catalysts were prepared by the impregnation method. The physicochemical properties were investigated by BET specific surface area,X-ray diffraction（XRD）,in situ diffuse reflectance infrared Fourier transform spectroscopy（ in situ DRIFTS）, NH_3 temperature-programmed desorption（NH_3-TPD）and high-resolution transmission electron microscopy（HRTEM）. Their catalytic performance for the selective catalytic reduction of NOx was also tested. The results indicate that the catalyst with 12% WO_3 exhibits 95% NO conversion within the wide temperature range of 250-400℃. The characterization results show that the specific surface area decreases with the load of WO_3 which is in a well-dispersed state. The strength of Brnsted acid sites are intensified after adding WO_3 which could account for the best catalytic performance of the catalyst V_2O_5-12%WO_3/TiO_2-SnO_2.
作者
廖永进
张亚平
朱一闻
余岳溪
王龙飞
LIAO Yongjin ZHANG Yaping ZHU Yiwen YU Yuexi WANG Longfei(ElectricPowerResearehInstitute of GuangdongPowerGridCo., Ltd., Guangzhou510080, Guangdong, China Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, Jiangsu, China)
出处
《化工进展》
EI
CAS
CSCD
北大核心
2017年第3期951-956,共6页
Chemical Industry and Engineering Progress
基金
国家自然科学基金(51306034)
江苏省重点研发计划(BE2015677)
国家重点基础研究发展计划(2013CB228505)项目
