摘要
以偏钛酸为原料,采用挤条成型的方法制备TiO2成型载体。考察焙烧温度对TiO2成型载体抗压强度、比表面积、孔容、孔径分布和晶相结构等的影响,采用XRD、BET、TG-DSC和SEM等手段对载体进行表征,并采用浸渍法制备了用于粗对苯二甲酸加氢精制的Pd/TiO2催化剂。结果表明,提高焙烧温度有利于提高成型载体的侧压强度,但会使成型载体的比表面积和孔容降低,孔径分布向大孔方向位移。焙烧温度超过800℃,锐钛型TiO2成型载体的晶型结构发生相变,逐步转变成金红石型。600℃制备的TiO2成型载体的侧压强度在110 N.cm-1以上,比表面积达60 m2.g-1。并用TiO2成型载体制备了质量分数0.5%Pd/TiO2催化剂,用于对苯二甲酸加氢精制过程,4-CBA转化率达99%以上,为对苯二甲酸加氢精制催化剂研究提供了新的载体。
Formed TiO2 support was prepared by extrusion using low cost metatitanic acid as starting material. The influence of calcination temperature on crush strength, surface area, pore volume, pore size distribution and crystal phase of the formed TiO2 supports were investigated, and the supports were characterized by XRD, BET, TG/DSC and SEM. Pd/TiO2 catalyst for hydrofining of raw terephthalic acid was prepared by impregnation. The results showed that higher calcination temperature favored higher crush strength but led to declining surface area and pore volume, and shift to macropores distribution. Crystal phase transformation of TiO2 supports from anatase to rutile occurred at calcination temperature of over 800℃. The formed TiO2 support calcined at 600℃ had crush strength of over 110 N · cm^-1 and surface area of 60 m2 · g^-1. 0.5% Pd/TiO2 catalyst was prepared and used in hydrofining of raw terephthalic acid, with 4-CBA conversion of over 99%.
出处
《工业催化》
CAS
2008年第12期30-33,共4页
Industrial Catalysis
关键词
催化剂工程
二氧化钛载体
焙烧温度
加氢精制
对苯二甲酸
catalyst engineering
titania support
calcination temperature
hydrofining
terephthalic acid
作者简介
季先进，1983年生，男，在读硕士研究生，研究方向为工业催化及医药中间体。
通讯联系人：曾崇余，男，教授，博士生导师，从事工业催化和医药中间体的研究。E-mail：cyzennjut@163．com
