Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Effect of preparation method on leaching of Ti from the redox molecular sieve TS-1
Autore:
Davies, L; McMorn, P; Bethell, D; Page, PCB; King, F; Hancock, FE; Hutchings, GJ;
Indirizzi:
Cardiff Univ, Dept Chem, Cardiff CF10 3TB, S Glam, Wales Cardiff Univ Cardiff S Glam Wales CF10 3TB ardiff CF10 3TB, S Glam, Wales Univ Liverpool, Dept Chem, Liverpool L69 3BX, Merseyside, England Univ Liverpool Liverpool Merseyside England L69 3BX , Merseyside, England Univ Loughborough, Dept Chem, Loughborough LE11 3TU, Leics, England Univ Loughborough Loughborough Leics England LE11 3TU 3TU, Leics, England Synetix, Billingham TS23 1LB, Cleveland, England Synetix Billingham Cleveland England TS23 1LB S23 1LB, Cleveland, England
Titolo Testata:
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
fascicolo: 4, volume: 3, anno: 2001,
pagine: 632 - 639
SICI:
1463-9076(2001)3:4<632:EOPMOL>2.0.ZU;2-6
Fonte:
ISI
Lingua:
ENG
Soggetto:
LIQUID-PHASE OXIDATIONS; TITANIUM SILICALITE TS-1; HYDROGEN-PEROXIDE; ALLYL ALCOHOL; HETEROGENEOUS CATALYSTS; METAL-IONS; N-BUTANE; EPOXIDATION; FRAMEWORK; VANADIUM;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
41
Recensione:
Indirizzi per estratti:
Indirizzo: Davies, L Cardiff Univ, Dept Chem, POB 912, Cardiff CF10 3TB, S Glam, Wales Cardiff Univ POB 912 Cardiff S Glam Wales CF10 3TB S Glam, Wales
Citazione:
L. Davies et al., "Effect of preparation method on leaching of Ti from the redox molecular sieve TS-1", PHYS CHEM P, 3(4), 2001, pp. 632-639

Abstract

The leaching of Ti from the redox molecular sieve TS-1 when used as a catalyst for the oxidation of crotyl alcohol with hydrogen peroxide is described and discussed. The crystallisation time of the TS-1 is found to be the critical preparation parameter. TS-1 prepared using a 2 day crystallisation period leaches Ti, whereas TS-1 prepared using a 10 day crystallisation period is inert to leaching. Silanisation of the external surface of the 2 day preparation effectively stops the leaching of Ti, without significantly affecting the catalytic performance. Similarly, treatment of the 2 day TS-1 with sodium azide also minimises leaching of Ti but with a reduction in catalytic activity. The Ti leaching is shown to be caused by the reaction of a triol with TS-1 in the presence of hydrogen peroxide from the surface of the2 day TS-1. A possible mechanism is proposed in which the triol by-productchelates the Ti, thereby breaking Ti-O-Si framework bonds and causing leaching to form a Ti species in solution. The reactivity of this Ti species insolution is modelled using the reaction of crotyl alcohol with hydrogen peroxide in the presence of titanyl acetylacetonate, and it is found that this effectively catalyses the formation of triol. Hence, it is concluded that, once initiated, Ti leaching will be catalysed by the reaction products ofthe solution Ti species that is formed.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/07/20 alle ore 21:05:22