氢离子、一价碱金属(K~+、Na~+)离子在缙云天然丝光沸石上对铂催化剂氧化活性的影响

选用有代表性的有机污染物——苯考察含有H~+、Na~+或K~+丝光沸石及其铂催化剂的氧化性能,关联它们对苯的不可逆吸附。认为催化剂上主要有两类吸附苯中心:铀原子中心和H~+、Na~+、K~+离子中心,铂原子是活化苯的中心。剖析苯在催化剂上的TPDi谱图,结H~+、Na~+、K~+对O~(2-)离子和铂原子集团的电子作用,认为H~+、Na~+、K~+对铂催化剂氧化程度的影响差异是由于于它们对O~(2-)和铂原子集团的电子作用不同。K~+、Na~+离子使邻近的铂原子有较多的活性中心,利用铂原子周围O~(2-)离子数目的调节,更好地理解这些离子对铂催化剂氧化用的本质。

The Effect of Cation(H~+ or Na~+ or K~+)on modified Jinyun Natural Mordenite on the Oxidation Activity of Platinum Catalyst

By relating the oxidation of benzene on platinum catalyst with modified natural mordenite containing H~+, Na~+ or K~+ as carrier to its Temperature Programmed Desorption(TPD),it is found that there are two kinds of adsorption sites——the cation sites and the platinum atom sites, and that the latter are more active. On further relating the TPD spectra of benzene to the electronic effect of the cations on O~(2-) and platinum atom groups, it is thought that the differences in their effects on O~(2-) and platinum atom groups lie in the distinction in their electronic effect. K~+ and Na~+ will enable the neighboring platinum atoms to have more active centres. Adjusting the number of O~(2-) around platinum atoms may. increase the catalyst activity.