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Titolo:
PREPARATION OF MOS2 AND WS2 CATALYSTS BY IN-SITU DECOMPOSITION OF AMMONIUM THIOSALTS
Autore:
ALONSO G; DELVALLE M; CRUZ J; LICEACLAVERIE A; PETRANOVSKII V; FUENTES S;
Indirizzi:
UNAM,CTR CIENCIAS MAT CONDENSADA,APDO POSTAL 2681 ENSENADA 22800 BAJACALIFORNIA MEXICO UNAM,CTR CIENCIAS MAT CONDENSADA ENSENADA 22800 BAJA CALIFORNIA MEXICO CTR INVEST CIENT & EDUC SUPER ENSENADA ENSENADA BAJA CALIFORNIA MEXICO UABC,FAC CIENCIAS QUIM TIJUANA BC MEXICO INST TECNOL,CTR GRADUADOS TIJUANA BC MEXICO
Titolo Testata:
Catalysis letters
fascicolo: 1-2, volume: 52, anno: 1998,
pagine: 55 - 61
SICI:
1011-372X(1998)52:1-2<55:POMAWC>2.0.ZU;2-Z
Fonte:
ISI
Lingua:
ENG
Soggetto:
AMORPHOUS MOLYBDENUM SULFIDES; HYDRODESULFURIZATION; CO; HYDROGENATION;
Keywords:
MOS2; WS2; THIOSALTS; IN SITU ACTIVATION; HYDRODESULFURIZATION; MECHANOCHEMISTRY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
31
Recensione:
Indirizzi per estratti:
Citazione:
G. Alonso et al., "PREPARATION OF MOS2 AND WS2 CATALYSTS BY IN-SITU DECOMPOSITION OF AMMONIUM THIOSALTS", Catalysis letters, 52(1-2), 1998, pp. 55-61

Abstract

The in situ decomposition of ammonium thiometallates during the hydrodesulfurization (HDS) of dibenzothiophene (DBT), to obtain molybdenum disulfide and tungsten disulfide catalysts, was investigated. It was found that very efficient catalysts for the HDS of DBT were obtained byin situ decomposition. Mechanical uniaxial pressing of the precursors(ammonium thiometallates) affected both textural and catalytic properties of the catalysts. Surface areas of molybdenum and tungsten disulfides increased as a function of uniaxial pressing, while catalytic activities went through a maximum. For MoS2, the hydrogenation selectivity was much higher for in situ catalysts than for ex situ ones. For WS2catalysts, the hydrogenation selectivity was less sensitive to the condition of decomposition (ex situ/in situ). The surface S/M (M = Mo, W) atomic ratio from the Auger signal decreased as a function of uniaxial pressing, while the CIM ratio remained almost constant at 1.6. The best catalyst showed an experimental S/Mo ratio that is slightly higher than the stoichiometric value. The effect of ill situ decomposition and mechanical deformation of thiometallate precursors is discussed.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 25/11/20 alle ore 04:49:38