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Titolo:
Catalytic study of WS2 undergoing electron irradiation
Autore:
Galvan, DH; Alonso, G; Rangel, R; Del Valle, M; Adem, E; Fuentes, S;
Indirizzi:
Univ Nacl Autonoma Mexico, Ctr Ciencias Mat Condensada, San Ysidro, CA 92143 USA Univ Nacl Autonoma Mexico San Ysidro CA USA 92143 an Ysidro, CA 92143 USA Ctr Invest Mat Avanzados, Chihuahua, Mexico Ctr Invest Mat Avanzados Chihuahua Mexico Avanzados, Chihuahua, Mexico Univ Michoacana, SNH, Escuela Ingn Quim, Morelia, Michoacan, Mexico Univ Michoacana Morelia Michoacan Mexico uim, Morelia, Michoacan, Mexico Univ Autonoma Baja California, Fac Ciencias Quim, Tijuana 21100, Baja California, Mexico Univ Autonoma Baja California Tijuana Baja California Mexico 21100 Mexico Univ Nacl Autonoma Mexico, Inst Fis, Mexico City 01000, DF, Mexico Univ Nacl Autonoma Mexico Mexico City DF Mexico 01000 y 01000, DF, Mexico Inst Mexicano Petr, Mexico City 07730, DF, Mexico Inst Mexicano Petr Mexico City DF Mexico 07730 ico City 07730, DF, Mexico
Titolo Testata:
JOURNAL OF CATALYSIS
fascicolo: 2, volume: 189, anno: 2000,
pagine: 263 - 268
SICI:
0021-9517(20000125)189:2<263:CSOWUE>2.0.ZU;2-J
Fonte:
ISI
Lingua:
ENG
Soggetto:
TRANSITION-METAL SULFIDES; HYDRODESULFURIZATION ACTIVITY; MOLYBDENUM SULFIDE; TUNGSTEN DISULFIDE; MOS2; DECOMPOSITION; EXFOLIATION; MODEL;
Keywords:
electron irradiation; catalytic activity; WS2 catalysts; HDS activity; DBT conversion;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
23
Recensione:
Indirizzi per estratti:
Indirizzo: Galvan, DH Univ Nacl Autonoma Mexico, Ctr Ciencias Mat Condensada, POB 439036, San Ysidro, CA 92143 USA Univ Nacl Autonoma Mexico POB 439036 San Ysidro CA USA 92143 SA
Citazione:
D.H. Galvan et al., "Catalytic study of WS2 undergoing electron irradiation", J CATALYSIS, 189(2), 2000, pp. 263-268

Abstract

Tungsten disulfide is irradiated with electrons at 1000 kGy and used as a catalyst in the hydrodesulfurization of dibenzothiophene, Catalytic conversion, selectivity, surface area, and other physical properties are then compared to those of crystalline WS2 and exfoliated WS2 for the same reaction. The dibenzothiophene conversion of irradiated samples is found to be 3.8 times greater than that of crystalline WS2, while the surface area decreases by 30%, Irradiation of WS2 lowers the selectivity for dicyclohexane, increasing the selectivities for biphenyl and phenylcyclohexane, Consequently, the hydrogenation/hydrodesulfurization ratio decreases by 42%. Microstructural characteristics of irradiated WS2 are analyzed by scanning electron microscopy and X-ray diffraction techniques. Scanning electron micrographs show evidence of crystal damage due to irradiation. The X-ray diffraction patterns of irradiated WS2 have weaker peak intensities compared to crystalline WS2, especially in the case of the (002) reflection. Peak width analysis indicates that the average crystal size of WS2 is smaller after irradiation. The enhanced catalytic activity of irradiated WS2 is discussed in terms of structural changes brought about by electron irradiation. (C) 2000 Academic Press.

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Documento generato il 25/11/20 alle ore 02:37:28