【摘要】 以不同温度(250、400、550℃)焙烧的TiO2纳米管(TNT)为载体,分别采用浸渍法和沉淀沉积法制备Pd负载催化剂Pd/TNT,用于研究氯苯气相加氢脱氯反应.采用透射电镜、X射线衍射、N2吸附-脱附、CO化学吸附等表征手段,探讨焙烧温度对载体性质和Pd分散性的影响.表征结果表明,沉淀沉积法比浸渍法制备的催化剂表面Pd粒子的分散性要好,而焙烧温度升高,载体表面羟基含量减少,TiO2纳米管由钛酸转变成锐钛矿结构.表征结果显示,Pd在400℃焙烧的载体上分散性最好,其对氯苯催化加氢脱氯反应的初活性高达92.9%,稳定性最好.更多还原

【Abstract】 Pd /TiO2nanotube( TNT) catalysts with TNT calcined at various temperatures were prepared using the deposition-precipitation and impregnation method,and were tested for the gas phase catalytic hydrodechlorination( HDC) of chlorobenzene. The catalysts were characterized by transmission electron microscope( TEM),X-ray diffraction( XRD),N2adsorption-desorption,CO chemisorption. The results showed that TNT calcined at 250 ℃ was dominated by titanate,while TNT calcined at 400 ℃ and 550 ℃ mainly consisted of anatase. The content of surface hydroxyl group of TNT decreased with calcination temperature. Catalyst prepared by deposition-precipitation exhibited better Pd dispersion than that prepared by impregnation method. For the catalytic HDC of chlorobenzene,the catalyst with TNT calcined at 400 ℃ exhibited a much higher activity and stability compared with those calcined at 250 ℃ and 550 ℃.更多还原