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Titolo:
FORMATION OF MULTILAYERED TIN ORGANOMETALLIC SURFACE SPECIES - PREPARATION OF NEW-TYPE OF SUPPORTED SN-PT CATALYSTS
Autore:
MARGITFALVI JL; BORBATH I; TFIRST E; TOMPOS A;
Indirizzi:
HUNGARIAN ACAD SCI,INST CHEM,CHEM RES CTR,POB 17 H-1525 BUDAPEST HUNGARY
Titolo Testata:
Catalysis today
fascicolo: 1-2, volume: 43, anno: 1998,
pagine: 29 - 49
SICI:
0920-5861(1998)43:1-2<29:FOMTOS>2.0.ZU;2-U
Fonte:
ISI
Lingua:
ENG
Soggetto:
SN-PT/AL2O3 CATALYSTS; BIMETALLIC CATALYSTS; PT/AL2O3;
Keywords:
PT/SIO2 CATALYST; SN-PT/SIO2 CATALYST; SURFACE ORGANOMETALLIC CHEMISTRY; CONTROLLED SURFACE REACTIONS; TIN TETRAETHYL; CATALYST MODIFICATION; HYDROGENATION OF CROTONALDEHYDE; FORMATION OF CROTYLALCOHOL;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
23
Recensione:
Indirizzi per estratti:
Citazione:
J.L. Margitfalvi et al., "FORMATION OF MULTILAYERED TIN ORGANOMETALLIC SURFACE SPECIES - PREPARATION OF NEW-TYPE OF SUPPORTED SN-PT CATALYSTS", Catalysis today, 43(1-2), 1998, pp. 29-49

Abstract

In this study, a new aspect of anchoring of tin organic moieties ontoplatinum is described and discussed. The new approach resulted in substantial increase of the Sn/Pt ratio in tin modified Pt/SiO2 catalysts. In the earlier approach, adsorbed hydrogen was exclusively used for tin anchoring, resulting in a monolayer of tin organic moieties at thetop of platinum. In the new approach, a large excess of either tin tetraethyl or hydrogen was used in the tin-anchoring reaction. The presence of coadsorbents, such as oxygen, also led to a substantial increase of the amount of tin anchored. When the primary formed SnR3 surface entities were partially decomposed, the coordinatively formed unsaturated -SnR2 and -SnR surface species provided additional anchoring sitesfor the next layer of SnR4. In the presence of adsorbed oxygen, additional new types of landing sites were created to anchor SnR4 in the neighborhood of platinum. The above approach resulted in Sn-Pt/SiO2 catalysts with exclusive tin-platinum interaction and an Sn/Pt ratio ca. 2. Results obtained in this study also reveal that the formation of surface organometallic moieties takes place in a stepwise way, e.g, the buildup of tin organic moieties occurs layer-by-layer. The supported Sn-Pt bimetallic entities formed showed both high activity and selectivity in the hydrogenation of crotonaldehyde to crotylalcohol. (C) 1998 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 15/07/20 alle ore 08:23:24