Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Deactivation of MoS2 catalysts during the HDS of thiophene
Autore:
Pedraza, F; Fuentes, S; Vrinat, M; Lacroix, M;
Indirizzi:
Inst Mexicano Petr, STI, Mexico City 07730, DF, Mexico Inst Mexicano PetrMexico City DF Mexico 07730 ico City 07730, DF, Mexico Inst Rech Catalyse, CNRS, F-69626 Villeurbanne, France Inst Rech CatalyseVilleurbanne France F-69626 9626 Villeurbanne, France
Titolo Testata:
CATALYSIS LETTERS
fascicolo: 2-4, volume: 62, anno: 1999,
pagine: 121 - 126
SICI:
1011-372X(1999)62:2-4<121:DOMCDT>2.0.ZU;2-0
Fonte:
ISI
Lingua:
ENG
Soggetto:
MOLYBDENUM SULFIDE CATALYSTS; UNSUPPORTED MOS2; ELECTRON-MICROSCOPY; MOLYBDATE CATALYSTS; HYDRODESULFURIZATION; TEMPERATURE; COBALT; DISPERSION; MODEL;
Keywords:
MoS2; deactivation; thiophene HDS; sintering;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
35
Recensione:
Indirizzi per estratti:
Indirizzo: Pedraza, F Inst Mexicano Petr, STI, Eje Cent L Cardenas 152, Mexico City 07730, DF, Mexico Inst Mexicano Petr Eje Cent L Cardenas 152 Mexico City DF Mexico 07730
Citazione:
F. Pedraza et al., "Deactivation of MoS2 catalysts during the HDS of thiophene", CATAL LETT, 62(2-4), 1999, pp. 121-126

Abstract

Catalytic properties of unsupported MoS2 catalysts in the thiophene hydrodesulfurization reaction were determined in the temperature range 623-653 K. The catalysts were prepared by ex situ decomposition of ammonium thiomolybdate (ATM) crystals in a mixture of 15% H2S in H-2 at 673 K. Activity of catalysts decreased very rapidly before reaching a steady state after 15 h on-stream. The thiophene conversion went down from 10-12 to 3-4% in that time. The surface area of the catalysts also decreased during the catalytic reaction from 40-50 to 8-10 m(2)/g. Selectivity for hydrodesulfurization, hydrogenation and isomerization reactions was affected distinctly by the deactivation process. By increasing the reaction time, double-bond isomerization increased, hydrogenation of butenes decreased and hydrodesulfurization remained constant. Results indicate that the main cause of activity decay was surface area loss that was due to sintering of MoS2 crystallites. Selectivity variation indicates that different active sites are involved for the three reactions. A deactivation model involving diminution of active sites located in edge and rim sites of small MoS2 particles is proposed to explain the variation of product distribution.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 25/11/20 alle ore 04:13:04