超声波对钙钛矿型催化剂LaNiO_3性能的影响

Study on the Effect of Ultrasound on the Property of Perovskite LaNiO_3

将普通共沉淀法制备的 L a Ni O3 复合氧化物进行超声波处理 ,以 NO、CO的催化燃烧为模型反应 ,考察超声波处理对 L a Ni O3 复合氧化物催化活性的影响。采用 TEM、SEM、BET和 XPS等表征手段研究超声波处理对L a Ni O3 复合氧化物粒径、表面形貌、比表面积和表面组成的影响 ,揭示超声波处理提高 L a Ni O3 复合氧化物催化活性的机理。结果表明 ,超声波辐射可以使 L a Ni O3 复合氧化物粒径减小、比表面积增加、表面晶格氧缺位和表面吸附氧增加 ,使 L a Ni O3 催化剂催化 NO分解和

In this paper the LaNiO 3 perovskite-type composite oxide prepared by coprecipitation,was treated in an ultrasonic field.TEM,SEM,BET and XPS,were used to study the effects of the ultrasonic treatment on the particle size,surface morphology,specific surface area and surface composition of NaNiO 3,composite oxide and catalytic activity.Mechanism of increasing catalytic activity of catalyst treated with ultrasound was analyzed.The results show that,after the ultrasonic treatment,the particle size decreased,the specific surface area increased,surface oxygen defect increased,surface adsorption oxygen increased and catalytic activity of LaNiO 3 catalyst increased.