【摘要】 <正> 载Ni沸石（A,X,Y和M型）上Ni²⁺的还原表明,沸石性质对Ni²⁺的可还原性和Ni⁰的分散度有明显影响,后者与载Ni沸石的催化性质密切相关.但是,对沸石结构与Ni²⁺的可还原性和Ni⁰分散度之间的关系迄今仍不清楚. 本文通过几种载Ni沸石（Y,M和ZSM-5型）上Ni²⁺还原和Ni⁰分散度的研究,观察沸石结构对它们的影响,并借助ESCA技术研究了NiNaY的还原试样在不同处理条件下表更多还原

【Abstract】 The nature of zeolite determines to a certain extent the reducibility of Ni(Ⅱ) ions and the degree of dispersion of metallic Ni on it. However the relationships between the zeolite structure and the reducibility of Ni(Ⅱ) or the dispersion of Ni0 are not well understood. In this paper, the reduction of Ni(Ⅱ) ions and the dispersion of Ni0 of several Ni-containing zeolites with different structures (Y, M and ZSM-5) have been studied. The re-oxidation of surface Ni?of reduced NiNaY zeolite under different treatment conditions is measured by ESCA technique. The results show that under definite pretreatment and reduction conditions, the Ni(Ⅱ) ions of NiNaM zeolite are completely reduced. For NiHM zeolite, the Ni(Ⅱ) ions are much more difficult to be reduced and the degree of dispersion of metallic Ni is the lowest. The effect of treatment conditions on the re-oxidation of Ni0 is apparent and the re-oxidation of Ni0 is accelerated by treatment with moist air. As a result of the re-oxidation of Ni0, a NiO phase forms in the surface layers and the surface (∑Ni/Si)5 ratio decreases.更多还原