【摘要】 以工业偏钛酸（TiO₂含量约380 g/L）为原料,采用均匀沉淀法制备钛基特种催化剂载体,研究了获得最小粒度的纳米TiO₂的工艺条件。结果表明:在硫酸浓度92%、酸钛比3∶1、反应温度110℃、反应时间1 h条件下进行酸解,工业偏钛酸的溶解度最大;在反应温度100℃、TiOSO₄浓度38 g/L、尿素实际用量与理论用量比值为1条件下,水解2 h并熟化30 min,TiOSO₄水解率最大,得到了同等条件下粒径最小的纳米TiO₂;在煅烧温度400℃、煅烧时间3 h条件下,可获得锐钛型纳米Ti O2,且粒径最小;加入BaCO₃解聚剂,可促进偏钛酸中的硫酸根生成Ba SO₄,沉硫的同时解聚二次团聚粒子;活性添加剂WO₃可使催化剂载体具有特有的活化性能,并可提供位阻效应,有效防止煅烧环节颗粒的聚集。更多还原

【Abstract】 Industrial metatitanic acid（ about 380 g / L TiO₂） was taken as raw material to prepare titanium-based special catalyst carrier by homogeneous precipitation method. Tests of process parameters were conducted to obtain nano titanium dioxide with minimal granularity. The results showed under the following processing conditions,including reaction at temperature of 110 ℃ for 1 h,with sulfuric acid concentration at 92%,acid and titanium at a ratio of 3,the industrial metatitanic acid had the highest solubility. At the reaction temperature of 100 ℃,with Ti OSO₄ concentration at 38 g / L and practical consumption of urea equal to the theoretical value,TiOSO₄ showed the highest hydrolysis rate after 2-hour hydrolysis and 30 min curing. Meanwhile,the nano titanium dioxide with the smallest particle size under the same conditions was obtained. Calcination at the temperature of 400 ℃ for 3 h yielded the nano anatase TiO2 with the smallest particle size. The further addition of BaCO₃ depolymerizing agent could promote the formation of BaSO₄ metatitanic acid sulfate in the sink and two-step depolymerization of agglomerated particles. The active additive WO₃ can lead to the catalyst carrier with unique activation properties,and also provide a steric effect to prevent the particles agglomeration in calcination.更多还原