An 1H NMR microimaging visualization of hexachloroplatinate dianion redistribution within a porous γ-Al2O3 pellet in the course of supported catalyst preparation

被引:21
作者
Khitrina, LY
Koptyug, IV
Pakhomov, NA
Sagdeev, RZ
Parmon, VN
机构
[1] Int Tomog Ctr, Novosibirsk 630090, Russia
[2] Boreskov Inst Catalysis, Novosibirsk 630090, Russia
来源
JOURNAL OF PHYSICAL CHEMISTRY B | 2000年 / 104卷 / 09期
关键词
D O I
10.1021/jp994412+
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The application of the H-1 NMR microimaging technique to the indirect mapping of the spatial distribution of hexachloroplatinate dianion within porous alumina pellets is reported. It is demonstrated that the nuclear spin-lattice relaxation times of liquids filling the pores of the pellet increase in the presence of the adsorbed hexachloroplatinate dianion, The microimaging results for the supported catalysts with two types of platinum distribution (egg-shell and egg-white) are shown to be consistent with the results obtained by the staining method and electron probe microanalysis. Finally, the microimaging technique is employed for a nondestructive visualization of the dynamics of the active component redistribution in the course of the supported catalyst preparation by competitive adsorption.
引用
收藏
页码:1966 / 1970
页数:5
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