|Search for content and authors|
Synthesis and catalytic activity of nanosized platinium catalyst stabilized by polyvinilpirrolidone
|Nelly Zakarina 1, Esen A. Bekturov 2|
1. Institute of Organic katalize and electrochemestry, Kunaeva 142, Almaty nelly, Kazakhstan
Nanosized colloidal particles of platinum were obtained by reduction of H2PtCl6 in methanol – water mixtures by refluxing. The reduction time, molecular mass and concentration of polyvinylpirrolidone (PVPD) were widely varied. The sizes of obtained platinum particles were determined by electron microscopy. It was shown that in case of PVPD with MM= 12*103 very small particles of metal are forming with practically equal sizes – 1-2 nm. With increasing of PVPD MM up to 24*103 together with small particles rather big mellow spheric clusters (12, 18, 30 and 42 nm) consisting of small particles appear. Fraction of such big aggregates increases with increasing of polymer MM. Decreasing of polymer concentration supports aggregation process. Significant increasing of metal particles sizes was observed in case of reduction by methanol during many hours of refluxing. High catalytic activity of obtained colloidal platinum in hydrogenization of unsaturated compounds and in hydro-conversion processes of n- alkanes was shown. Possibility of remarkable decreasing of platinum content in supported catalysts by using colloidal platinum, stabilized by PVPD was demonstrated.
Presentation: Poster at E-MRS Fall Meeting 2006, Symposium D, by Nelly Zakarina
See On-line Journal of E-MRS Fall Meeting 2006
Submitted: 2006-07-06 19:18 Revised: 2009-06-07 00:44