Abstract:

Potassium titanates were prepared by sol-gel method and having a high crystallinity. The structure, composition and framework of the material were investigated by means of X-ray diffraction (XRD), intelligent weight analyzer (IGA) and molecular simulation software. Catalytic activity of the catalysts for catalytic combustion of soot form diesel engines were treated. It is revealed that the potassium titanates catalysts have better soot oxidation performance compared with tradational catalysts. And through the different K/Ti of the titanium catalyst decarburization results show that K/Ti of 1∶1 potassium titanate catalyst for the removal of carbon black particles best; in loose contact with the next still able to maintain good activity. soot oxidation in titanates catalysts is the frist reactionary order. And the kinetic equation is well fitted with the experimental data.

Key words:

Potassium titanates,    , Soot,    , Catalytic combustion,    ,  Reaction kineticsmso-ascii-theme-font: minor-latin, mso-fareast-font-family: 宋体, mso-fareast-theme-font: minor-fareast, mso-hansi-theme-font: minor-latin, mso-ascii-font-family: Calibri, mso-hansi-font-family: Calibri">

摘要： 　采用溶胶-凝胶法合成了K₂ T_i4O₉ , K2 Ti₆O₁₃ 和K₂ Ti₂O₅ 钛酸钾型催化剂。利用X 射线衍射 (XRD)、智能重量分析仪(IGA)等手段进行了表征, 同时采用固定床对钛酸钾催化脱除柴油机尾气中碳烟颗粒的性能进行了测试, 并对钛酸钾催化氧化碳烟的动力学进行了研究。结果表明, 钛酸钾与传统催化剂相比具有更高的碳烟颗粒氧化性能, 在松散接触下依然能保持良好的活性, 且钾钛物质的量比为1 ∶1 的钛酸钾催化剂的脱除碳烟颗粒的效果最好。钛酸钾作用下碳烟的氧化为一级动力学反应, 且所建立的碳烟燃烧动力学方程与实验数据拟合较好。

关键词: 钛酸钾 , 碳烟颗粒 , 催化燃烧 , 动力学参数