【摘要】 采用共沉淀法制备TiO₂-SnO₂固溶体,浸渍法负载WO₃和V₂O₅得到一系列V₂O₅-（x%）WO₃/TiO₂-SnO₂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（NH₃-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:V₂O₅-12%WO₃/TiO₂-SnO₂催化剂在250⁴00℃的温度窗口具有95%的NO_x转换率;随着WO₃负载量增加,催化剂比表面积有所减小;WO₃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WO₃负载量增加逐渐增大,这是V₂O₅-（12%）WO₃/TiO₂-SnO₂催化剂具有最佳脱硝活性的主要原因。更多还原

【Abstract】 TiO₂-SnO₂ solid solution was prepared by a co-precipitation method and V₂O₅-（x%）WO₃/ TiO₂-SnO₂ 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）, NH₃ temperature-programmed desorption（NH₃-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% WO₃ exhibits 95% NO conversion within the wide temperature range of 250⁴00℃. The characterization results show that the specific surface area decreases with the load of WO₃ which is in a well-dispersed state. The strength of Br?nsted acid sites are intensified after adding WO₃ which could account for the best catalytic performance of the catalyst V₂O₅-12%WO₃/TiO₂-SnO₂.更多还原