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Titolo:
Preparation of WS2 catalysts by in situ decomposition of tetraalkylammonium thiotungstates
Autore:
Alonso, G; Petranovskii, V; Del Valle, M; Cruz-Reyes, J; Licea-Claverie, A; Fuentes, S;
Indirizzi:
Inst Mexicano Petr, Mexico City 07730, DF, Mexico Inst Mexicano Petr Mexico City DF Mexico 07730 ico City 07730, DF, Mexico Ctr Invest Mat Avanzados, Chihuahua, Chih, Mexico Ctr Invest Mat Avanzados Chihuahua Chih Mexico , Chihuahua, Chih, Mexico Univ Autonoma Baja California, Fac Ciencias Quim, Tijuana, BC, Canada UnivAutonoma Baja California Tijuana BC Canada uim, Tijuana, BC, Canada Inst Tecnol, Grad Ctr, Tijuana, BC, Canada Inst Tecnol Tijuana BC CanadaInst Tecnol, Grad Ctr, Tijuana, BC, Canada
Titolo Testata:
APPLIED CATALYSIS A-GENERAL
fascicolo: 1, volume: 197, anno: 2000,
pagine: 87 - 97
SICI:
0926-860X(20000424)197:1<87:POWCBI>2.0.ZU;2-X
Fonte:
ISI
Lingua:
ENG
Soggetto:
TUNGSTEN SULFIDE CATALYSTS; EX AMMONIUM TETRATHIOMOLYBDATE; OXYGEN; HYDRODESULFURIZATION; THIOMOLYBDATES; ALKANES; CARBIDE; CO;
Keywords:
WS2; tetraalkylammonium thiosalts; in situ activation; hydrodesulfurization;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
32
Recensione:
Indirizzi per estratti:
Indirizzo: Fuentes, S Inst Mexicano Petr, Eje Cent L Cardenas 152,Apdo Postal 14-805,Mexico City 07730, DF, Mexico Inst Mexicano Petr Eje Cent L Cardenas 152,Apdo Postal 14-805 Mexico City DF Mexico 07730
Citazione:
G. Alonso et al., "Preparation of WS2 catalysts by in situ decomposition of tetraalkylammonium thiotungstates", APP CATAL A, 197(1), 2000, pp. 87-97

Abstract

Tungsten tetraalkylammonium thiosalts are used as precursors for the in situ formation of WS2 catalysts in dibenzothiophene (DBT) hydrodesulfurization. The thermal decomposition of alkyl-ammonium thiosalts proceeds directly to WS2 without WS3 formation, as in the case of ammonium thiotungstate (ATT), allowing good control of the catalyst's stoichiometry, The alkyl-ammonium thiosalts give WS2 particles with different characteristic morphologies. The hydrodesulfurization (HDS) activities of WS2 catalysts derived from alkylthiosalts are higher than those of catalysts derived from the ammonium thiosalt, The reaction rate increases with the size of the cation in the precursor. No correlation of catalytic activities with surface areas is found. The S/W and C/W surface ratios determined by Auger electron spectroscopy decrease with increasing cation size. Surface composition is WS2.25C1.7, WS1.7 C-0.9 and WS1.3 C-0.7 for the in situ catalysts derived from ammonium, methylammonium, and butylammonium precursors, respectively. The improved catalytic properties of WS2 catalysts derived from alkylammonium thiosalts in the HDS of DBT are attributed to the formation of carbon-containing tungstensulfide phases on the catalyst's surface. (C) 2000 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 25/11/20 alle ore 04:17:06