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研究了La_(1-1·333X)Th_XNiO_(3-λ)(0≤x≤0.75)催化剂的固态性质与催化氢氧化性能的关系。发现在LaNiO_3中掺入Th~(4+)能形成阳离子空位,稳定体系中Ni~(3+)浓度和降低氧空位的有序化程度,从而提高了催化剂的NO选择性。氨氧化制硝酸的主要活性氧种可能是定位在氧空位上的O~-离子。催化机理遵从Redox机理,阳离子空位的形成有利于Redox过程的进行。
The relationship between the solid state properties of La_ (1-1.33X) Th_XNiO_ (3-λ) (0≤x≤0.75) catalyst and the catalytic hydro-oxidation performance was investigated. It was found that the incorporation of Th ~ (4+) in LaNiO_3 can form cationic vacancies, stabilize the concentration of Ni ~ (3 +) in the system and reduce the ordering degree of oxygen vacancies, thereby increasing the NO selectivity of the catalyst. Ammonia oxidation of nitric acid is the main active oxygen species located in the oxygen vacancies O ~ - ions. The catalytic mechanism follows the Redox mechanism and the formation of cationic vacancies favors the Redox process.