TiO2载体对Mn-Ce/TiO2催化剂脱硝活性的影响

以TiO₂为载体,选取过渡金属元素Mn为活性组分,稀土金属元素Ce为活性助剂,采用分步共混法制备了Mn-Ce/TiO₂催化剂（活性组分负载量16%）,系统研究了TiO₂载体的晶型和晶粒尺寸对催化剂脱硝活性的影响。实验结果表明：分别以锐钛矿型和金红石型TiO₂为载体制备的催化剂,其低温脱硝活性相差不大,活性组分均以无定型态高度分散于载体中,以金红石型TiO₂为载体制备的催化剂中部分TiO₂转变为锐钛矿型;以不同晶粒尺寸TiO₂载体制备的催化剂的低温脱硝活性相差较大,比表面积较大、晶粒尺寸较小的TiO₂载体制备的催化剂,其脱硝活性低于晶粒尺寸较大的TiO₂载体制备的催化剂。

Effect of TiO2 support on denitration activity of Mn-Ce/TiO2 catalyst

Mn-Ce/TiO₂ catalyst with 16% of active constituents loading amount was prepared by step-by-step blended method with transition metal element Mn as active constituent,rare earth element Ce as active additive,TiO₂ as support. The effects of crystal type and grain size of TiO₂ support on denitration activity of catalyst were systematically investigated. The experimental results show that：The low-temperature denitration activities of catalysts which are prepared using anatase and rutile TiO₂ as support respectively are almost the same,the active components both highly dispersed in the supports in an amorphous phase,and some TiO₂ in the rutile TiO₂ supported catalyst is converted to anatase;The low-temperature denitration activities of catalysts which are prepared using TiO₂ with different grain size as support respectively are differ considerably,the denitration activity of catalyst prepared using TiO₂ with larger specific surface area and smaller grain size is lower than that with larger grain size.