La2-xBaxCuO4和La1-xBaxFeO3催化分解NO研究

用柠檬酸络合爆炸法合成了碱土金属Ba掺杂的La2-xBaxCuO4,用溶胶-凝胶法制备了Ba掺杂的La1-x,BaxFeO3作为NO分解的催化剂,通过XRD表征了其物相结构,考察了制备系列催化剂催化分解NO的活性.结果表明:碱土金属Ba的取代可明显改善复合氧化物的NO催化分解活性,Ba的掺入有效提高了样品的氧化能力,使得催化效率得以提高.

Direct decomposition of nitric oxide over La2-x Bax CuO4 and La1-x Bax FeO3

The complex oxides La2-xBaxCuO4 with perovskite-like structure and La1-xBaxFeO3 with perovskite structure have been synthesized by citrate combustion method and sol-gel method,respectively.They were analyzed by XRD to explore their composition and structure.When Ba2+ replaced La3+,the samples had the perovskite phase LaCuO3 and BaCO3 phase along with the amount of Ba doping increased.A decrease intensity and a broad shape in the characteristic diffraction line of LaFeO3 and phase with further increasing Ba amount(x≥0.15)is also observed,which reveals that the crystal structure is distorted with the increase in Ba content.Meanwhile,BaCO3 phase(witherite phase)appears at 2θ=23.7.The catalytic activity for NO decomposition was then observed.It was found that the samples in which Ba substituted for La had improved catalytic activity.The Ba substitution promotes the redox capability of catalysts and improves the mobility of lattice oxygen,which explains the enhanced catalytic performance.