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Titolo:
Enantioselective hydrogenation of pyruvate esters in the mesoporous environment of Pt-MCM-41
Autore:
Hall, TJ; Halder, JE; Hutchings, GJ; Jenkins, RL; Johnston, P; McMorn, P; Wells, PB; Wells, RPK;
Indirizzi:
Univ Cardiff, Dept Chem, Cardiff CF10 3TB, S Glam, Wales Univ Cardiff Cardiff S Glam Wales CF10 3TB ardiff CF10 3TB, S Glam, Wales Univ Hull, Dept Chem, Hull HU6 7RX, N Humberside, England Univ Hull Hull N Humberside England HU6 7RX U6 7RX, N Humberside, England
Titolo Testata:
TOPICS IN CATALYSIS
fascicolo: 1-4, volume: 11, anno: 2000,
pagine: 351 - 357
SICI:
1022-5528(2000)11:1-4<351:EHOPEI>2.0.ZU;2-M
Fonte:
ISI
Lingua:
ENG
Soggetto:
MODIFIED PLATINUM; MOLECULAR-SIEVES; MCM-41; CATALYSTS; SILICA;
Keywords:
enantioselective hydrogenation; platinum; cinchonidine; catalyst modifier; pyruvate hydrogenation; MCM-41; Pt-MCM-41 preparation; Pt-MCM-41 characterisation;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
23
Recensione:
Indirizzi per estratti:
Indirizzo: Wells, PB Univ Cardiff, Dept Chem, Cardiff CF10 3TB, S Glam, Wales Univ Cardiff Cardiff S Glam Wales CF10 3TB 0 3TB, S Glam, Wales
Citazione:
T.J. Hall et al., "Enantioselective hydrogenation of pyruvate esters in the mesoporous environment of Pt-MCM-41", TOP CATAL, 11(1-4), 2000, pp. 351-357

Abstract

Pt-MCM-41 catalysts having loadings of up to 2% Pt have been synthesised using three strategies: (i) direct synthesis from a Pt2+-containing gel, (ii) exchange of Na+ in Al-MCM-41 (containing 8% aluminium) for Pt2+, (iii) exchange of H+ in H-MCM-41 (containing 1% aluminium) for Pt2+. HRTEM confirmed the retention of the mesoporous structure in the active catalysts and gave information on Pt particle size and location. Al-27 NMR provided information on the movement of aluminium within the structure during catalyst preparation. Enantioselective hydrogenation of methyl and ethyl pyruvate was catalysed by cinchonidine-modified Pt-MCM-41 at 293 K and elevated hydrogen pressures; performance was compared to that provided by the standard reference catalyst EUROPT-1. Catalysts prepared by strategies (i) and (ii) performed best, giving values of the enantiomeric excess comparable to those afforded by EUROPT-1 at rates moderated by an order of magnitude by mass transfereffects. Performance was impaired when Pt particle size in the mesopores was so small that conditions favoured racemic reaction.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/09/20 alle ore 18:49:10