NOVEL TEMPLATING FABRICATION OF NANO-STRUCTURED PT CLUSTERS AND WIRESIN THE ORDERED CYLINDRICAL MESOPORES OF FSM-16 AND THEIR UNIQUE PROPERTIES IN CATALYSIS AND MAGNETISM

Citation
M. Sasaki et al., NOVEL TEMPLATING FABRICATION OF NANO-STRUCTURED PT CLUSTERS AND WIRESIN THE ORDERED CYLINDRICAL MESOPORES OF FSM-16 AND THEIR UNIQUE PROPERTIES IN CATALYSIS AND MAGNETISM, MICROPOROUS AND MESOPOROUS MATERIALS, 21(4-6), 1998, pp. 597-606
Citations number
28
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Chemistry Physical","Material Science","Chemistry Applied
ISSN journal
1387-1811
Volume
21
Issue
4-6
Year of publication
1998
Pages
597 - 606
Database
ISI
SICI code
1387-1811(1998)21:4-6<597:NTFONP>2.0.ZU;2-9
Abstract
The robust trigonal prismatic cluster anions such as [Pt-3(CO)(6)](5)( 2-) and [Pt-3(CO)(6)](6)(2-) were selectively synthesized in the order ed hexagonal channels (2.8 and 4.7 nm diameter) of FSM-16 and ZrO2-mod ified FSM-16 by a 'ship-in-bottle' technique in the reductive carbonyl ation of H2PtCl6 with CO+H2O at 323 K. The cluster anions were charact erized by FTIR, UV-visible, TEM and EXAFS spectroscopy. The Zr oxide-m odified FSM-16 was prepared by CVD method using Zr(2-propoxyl)(4) impr egnated with FSM-16, followed by calcination at 723 K. The controlled removal of CO from [Pt-3(CO)(6)](5)(2-) and [Pt-3(CO)(6)](6)(2-) in FS M-16 by thermal evacuation at 300-423 K yields nanostructured Pt clust ers of 1.5-2 nm diameter highly dispersed in the channels of FSM-16. B y contrast, Pt nano-wires were prepared by a templating reduction of P t salts impregnated in FSM-16 (2.8 and 4.7 nm) under photo- and gamma- ray irradiation (see Scheme 1). They exhibited unique properties in CO chemisorption and magnetism due to their anisotropic morphology of Pt nano-wires aligned in the ordered mesoporous channels of FSM-16, whic h were quite different from those of Pt nano-particles. (C) 1998 Elsev ier Science B.V. All rights reserved.