Thermal Decomposition of Metal Carbonyls on Oxide Supports Containing Surface Hydrides: a Route to Highly Dispersed Metal Catalysts with Unusual Properties Full article
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Applied Catalysis (up to 1991)
ISSN: 0166-9834 |
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| Output data | Year: 1989, Volume: 55, Number: 1, Pages: 235-258 Pages count : 24 DOI: 10.1016/S0166-9834(00)82331-3 | ||
| Tags | metal carbonyl thermal decomposition silica support; iron silicon catalyst preparation carbonyl; cobalt silica catalyst preparation carbonyl; ruthenium silica catalyst preparation carbonyl; particle size catalyst preparation carbonyl | ||
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Abstract:
A method of preparation of fairly dispersed metal catalysts on oxide supports is described. The Co, Fe, FeCo and Rh carbonyls, when chemisorbed on silica with anchored hydrides of Ti or Al and then subjected to thermal decomposition, produce very small species consisting of several up to several tens of metal atoms. Thermal decomposition of a heteronuclear FeCo cluster leads to formation of bimetallic FeCo particles. The Co, Fe and CoFe samples so obtained possess unusual magnetic properties. On varying temperature and strength of the magnetic field, their magnetization alters in a manner specific for the super paramagnetic particles, but there is no signal of ferromagnetic resonance in ESR spectra. With increasing loading of the supported Fe and Co carbonyls, both chemisorbed and weakly bound carbonyl complexes are on the surface of the support. Larger metallic crystallites are formed in this case at pyrolysis and a FMR signal appears in the spectra. The crystallites are, however, much smaller (near 1 nm) than those obtained on non-modified silica. The metal particles in the samples show high stability to sintering under vacuum but grow in size under conditions of CO hydrogenation (up to about 1.5–2 nm). The growing is accompanied by the appearance of the FMR signal for all the samples containing Co or Fe. Carbide formation presumably takes place on the Fe catalyst during CO hydrogenation. The catalytic properties in the CO + H2 reaction are affected by both the size of metal particles in the catalysts and the chemical nature of the support. In particular, highly dispersed Co and CoFe catalysts demonstrate an increased selectivity towards ethanol production; the ethanol yield being higher than on the Rh catalysts prepared analogously.
Cite:
Lisitsyn A.S.
, Golovin A.V.
, Chuvilin A.L.
, Kuznetsov V.L.
, Romanenko A.V.
, Danilyuk A.F.
, Yermakov Y.I.
Thermal Decomposition of Metal Carbonyls on Oxide Supports Containing Surface Hydrides: a Route to Highly Dispersed Metal Catalysts with Unusual Properties
Applied Catalysis (up to 1991). 1989. V.55. N1. P.235-258. DOI: 10.1016/S0166-9834(00)82331-3 WOS Scopus РИНЦ ANCAN OpenAlex
Thermal Decomposition of Metal Carbonyls on Oxide Supports Containing Surface Hydrides: a Route to Highly Dispersed Metal Catalysts with Unusual Properties
Applied Catalysis (up to 1991). 1989. V.55. N1. P.235-258. DOI: 10.1016/S0166-9834(00)82331-3 WOS Scopus РИНЦ ANCAN OpenAlex
Dates:
| Submitted: | Mar 10, 1988 |
| Published print: | Nov 1, 1989 |
| Published online: | Oct 2, 2001 |
Identifiers:
| Web of science: | WOS:A1989CB65600008 |
| Scopus: | 2-s2.0-0024768250 |
| Elibrary: | 31090330 |
| Chemical Abstracts: | 1990:105785 |
| Chemical Abstracts (print): | 112:105785 |
| OpenAlex: | W1980521113 |