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金属在载体上的分散状况,是催化研究中的一个重要问题。本文着重介绍Pt/Al_2O_3催化剂金属分散度的H_2-O_2滴定法测定。按照化学计量式:给出了Pt分散度R,此表面S,和晶粒大小d的计算公式。在流动态装置和室温条件下,各种类型Pt催化剂化学吸附氧的气体氢脉冲滴定结果表明,浸渍法催化剂Pt晶粒大小在10(?)左右,共胶法催化剂在17—25■之间,与文献上静态法氢吸附数据良好一致。方法的测定误差在±5％以内。
The dispersion of metal on the carrier is an important issue in catalytic research. This article focuses on the H 2 O 2 titration of Pt / Al 2 O 3 catalysts. According to the stoichiometry: given Pt dispersion R, the surface S, and the grain size d formula. The results of hydrogen gas pulse titration of chemisorbed oxygen of various types of Pt catalysts show that the size of Pt particles in the impregnation method is about 10 (?) And the co-polymer catalyst is between 17-25 ■ at flow state and at room temperature. , Which is in good agreement with the static hydrogen adsorption data in the literature. The method of determination of error within ± 5%.