SO_4^(2-)/TiO_2催化合成高品质对苯二甲酸二甲酯的研究  

Study on Synthesis of Terephthalic Acid Dimethyl Ester with SO_4^(2-)/ TiO_2 as Catalyst

作　　者：朱敏莉 郑化安 张生军 王丹君 

机构地区：[1]陕西煤业化工技术研究院,陕西西安710065

出　　处：《广州化工》2016年第9期95-98,共4页GuangZhou Chemical Industry

摘　　要：采用沉淀-浸渍法制备固体酸SO_4^(2-)/TiO_2催化剂,通过XRD,Raman,XRF,N_2吸附解析,NH_3-TPD等技术对催化剂进行结构和酸性能表征。以甲醇和对苯二甲酸的酯化反应为模型反应,考察了不同焙烧温度的催化剂的催化反应活性。实验结果表明:300℃焙烧的催化剂具有最大比表面积和酸性位点,反应活性最好,酯化反应转化率为95%,产物对苯二甲酸二甲酯选择性为97%。Solid catalysts SO 2-4 /TiO2 were prepared by precipitation method with different calcination temperatures . The textural properties of the catalysts were studied by means of XRD , Raman, XRF, N2 adsorption-desorption.Acidity properties of the catalysts were tested by NH 3-TPD.Esterification of methanol and terephthalic acid over SO 2-4 /TiO2 was studied.Experimental results showed that the SO 2-4 /TiO2 calcinated at 300 ℃ presented the higher surface area and the amount of strong acid sites than the others .The SO2-4 /TiO2-300 ℃exhibited a catalytic activity with 95%conversion of terephthalic acid and 97%selectivity of dimethyl terephthalate after 3 h at 70 ℃under atmospheric pressure .

关 键 词：固体酸催化剂 表征 酸性能 酯化 

分 类 号：TQ426.81[化学工程]