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
The catalytic performance of sulfided Mn/Al 2O 3 and Cu-Mn/Al 2O 3 catalysts for the ammonia decomposition has been studied by using a fixed-bed flow apparatus. It is found that the addition of copper component to Mn/Al 2O 3 catalyst can increase its catalytic activity for ammonia decomposition. The results of TPR indicate that the existence of copper component significantly improves the reduction of catalysts, which is beneficial to form active metal sulfide phase to catalyze the reduction of SO 2 to H 2S by hydrogen. X-ray diffraction results reveal that the Cu-Mn/Al 2O 3 catalyst (n Cu /n Mn =0.4) contains a CuMn 2O 4 phase before reaction, and displays MnS peaks after reaction.
