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Lee, Jae Sung
Eco-friendly Catalysis and Energy Lab
Research Interests
  • Photocatalytic water splitting, artificial photosynthesis, fuel cells, heterogeneous catalysis

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STRUCTURE AND DISTRIBUTION OF ALKALI PROMOTER IN K/MOS2 CATALYSTS AND THEIR EFFECTS ON ALCOHOL SYNTHESIS FROM SYNGAS

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dc.contributor.author WOO, Hee Chul ko
dc.contributor.author NAM, In-Sik ko
dc.contributor.author Lee, Jae Sung ko
dc.contributor.author CHUNG, Jung Shik ko
dc.contributor.author Kim, Young Gul ko
dc.date.available 2015-07-29T00:58:12Z -
dc.date.created 2015-07-27 ko
dc.date.issued 1993-08 -
dc.identifier.citation JOURNAL OF CATALYSIS, v.142, no.2, pp.672 - 690 ko
dc.identifier.issn 0021-9517 ko
dc.identifier.uri https://scholarworks.unist.ac.kr/handle/201301/12998 -
dc.identifier.uri http://www.sciencedirect.com/science/article/pii/S0021951783712406 ko
dc.description.abstract Potassium-promoted MoS2 catalysts were investigated by scanning Auger electron spectroscopy, electron probe microanalysis, X-ray energy dispersive spectroscopy, and elementary chemical analysis to elucidate the role of potassium on MoS2. Fresh samples exhibited a uniform distribution of the alkali elements by CO hydrogenation, whereas the oxidized sample showed a segregation of the potassium component in the bulk of the catalyst. The fresh K2CO3-, K2O2-, and K2S-promoted MoS2 catalysts show high selectivities to alcohols and their IR spectra present two characteristic bands at 1650 and 1400 cm-1 assigned to a bicarbonate-like species which is believed to be an active intermediate for the synthesis of alcohols. No such IR bands appear in the cases of K2SO4- and KCl-promoted MoS2 and oxidized K2CO3/MoS2 catalysts which mainly produce hydrocarbons instead of alcohols. A mechanism based on this intermediate is proposed for the alcohol formation from CO-H2. In addition, the enhanced catalytic activity and high selectivity to C2+, hydrocarbons of the oxidized K2CO3/MoS2 is believed to be due to the transfer of electron from the alkali metal diffused into the bulk of MoS2, resulting in an increase in electron density as well as in the density of states at the Fermi surface. The alkali metal on the MoS2 acts as a medium for oxygen supply ("sponge") in the atmosphere and promotes oxidation of Mo(IV) to Mol(VI) and S2- to S6+ states. © 1993 Academic Press. All rights reserved. ko
dc.description.statementofresponsibility close -
dc.language ENG ko
dc.publisher ACADEMIC PRESS INC ELSEVIER SCIENCE ko
dc.subject FISCHER-TROPSCH CATALYSTS ko
dc.subject AMMONIA-SYNTHESIS ko
dc.subject CO HYDROGENATION ko
dc.subject OXIDATION ko
dc.subject MOS2 ko
dc.subject CS ko
dc.subject ADSORPTION ko
dc.subject MECHANISM ko
dc.subject SULFIDE ko
dc.subject SILICON ko
dc.title STRUCTURE AND DISTRIBUTION OF ALKALI PROMOTER IN K/MOS2 CATALYSTS AND THEIR EFFECTS ON ALCOHOL SYNTHESIS FROM SYNGAS ko
dc.title.alternative STRUCTURE AND DISTRIBUTION OF ALKALI PROMOTER IN K/MOS2 CATALYSTS AND THEIR EFFECTS ON ALCOHOL SYNTHESIS FROM SYNGAS ko
dc.type ARTICLE ko
dc.identifier.scopusid 2-s2.0-0006816195 ko
dc.identifier.wosid A1993LN76100029 ko
dc.type.rims ART ko
dc.description.wostc 33 *
dc.description.scopustc 36 *
dc.description.scopustc 36 *
dc.date.tcdate 2015-12-28 *
dc.date.scptcdate 2015-11-04 *
dc.date.scptcdate 2015-11-04 *
dc.identifier.doi 10.1006/jcat.1993.1240 ko
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