TiO_2的基本性质对SCR脱硝催化剂制造的影响

Effect of TiO_2 properties of the manufacture of SCR deNO_x catalyst

针对广泛应用的蜂窝型SCR催化剂的制造过程,分析了主要原材料TiO2的基本性质,如颗粒大小、粒度分布、形状、团聚程度、化学组成和纯度等,以及这些基本性质对催化剂制造过程中混合、挤出、干燥和煅烧等工序的影响。研究结果表明,精细程度非常高的脱硝催化剂制造过程对TiO2的要求是:粒度分布范围较窄或单一,颗粒为球形或等轴形状,在混合工序所要求的pH值条件下团聚程度低以及TiO2的化学组成和纯度指标高。

Aiming at the fabrication process of widely used honeycomb SCR catalyst,the properties of TiO2 has been analyzed,including particle size,size distribution,shape,degree of agglomeration,chemical composition and purity,and their influence on manufacture procedure of mixing,extrusion,drying and calcinations.The fine fabrication of SCR catalyst is facilitated by the narrow or monodisperse size distribution of TiO2,spherical or equiaxial shape TiO2 particles,low agglomeration degree of TiO2 particles at the required pH in mixing procedure.High standard is also required on the chemical composition and purity of TiO2.