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本文研究了载NiY型沸石酸性对Ni~(2+)还原的影响。结果表明:于给定的预处理和还原条件下,沸石H~+酸度增加,N i~(2+)还原度(α)减小;还原后沸石的H+酸度彼此相近,趋于一定数值范围(约22～25H+/U.C.),还原前、后H+酸度之差值(△H+/U.C.)与还原度(α)之间有对应关系,但非化学计量的。当沸石H+酸度和Ni~(2+)交换度两者共同影响a值时,α主要取决于沸石的H+酸度;沸石H+酸度和N i~(2+)的还原度对Ni~0分散性没有明显的影响。由NiNaHY试样的异辛烷临氢裂化反应表明,于低转化时,裂化是呈对称的即β-断裂,主产物是异丁烷,N io的导入使产物中烯烃含量大大降低。
In this paper, the effect of NiY-type zeolite acidity on Ni 2+ reduction was studied. The results showed that under the given pretreatment and reduction conditions, the acidity of H + increased and the reduction degree of N i ~ (2+) decreased. After the reduction, the H + acidity of the zeolite was close to each other and reached a certain value range (About 22 ~ 25H + / UC), the difference between H + acidity before and after reduction (△ H + / UC) and reduction degree (α) is corresponding but not stoichiometric. When both the acidity of H + and the exchange degree of Ni 2+ affect a value, α mainly depends on the H + acidity of the zeolite; the degree of reduction of the H ~ 0 dispersivity No obvious effect. The hydrocracking of isooctane by NiNaHY sample shows that at low conversion, the cracking is symmetrical, that is, β-cleavage. The main product is isobutane. The introduction of N io greatly reduces the olefin content in the product.