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Title: Effect of the K-Mo interaction in K-MoO[sub 3]/[gamma]-Al[sub 2]O[sub 3] catalysts on the properties of alcohol synthesis from syngas

Abstract

A series of K-MoO[sub 3]/[gamma]-Al[sub 2]O[sub 3] catalysts was prepared by varying the K/Mo atomic ratios between 0 and 1.5, maintaining molybdenum content as constant. The structures of the samples were characterized by several techniques (LRS, XRD, XPS, ESR, TPR, O[sub 2], CO and H[sub 2] chemisorption, and TPD) and accounted for the catalytic properties for alcohol synthesis from synthesis gas. It is revealed that for the potassium-promoted samples and interaction between the potassium promoter and the supported molybdenum component occurs. The amount of the species resulting from this interaction gets saturated at a K/Mo ratio of 0.8. On the oxidic samples, K-Mo interaction species which may contain potassium cations and an Mo[sub 7]O[sup 6[minus][sub 24]] unit are formed. This retards, to some extent, the sulfidation and reduction of Mo(VI) to Mo(IV). The sulfidation of the interaction species leads to the aggregation of MoS[sub 2] and the formation of surface [open quotes]K-Mo-S[close quotes] species. At K/Mo ratios above 0.8, KCl crystallites form; some amount of KCl, which is not aggregated, covers the exposed molybdenum surface, and decreases the amount of [open quotes]K-Mo-S[close quotes] species and Mo(CUS) sites. The activity toward alcohol formation over the sulfided samples is in parallel withmore » the extent of the K-Mo interaction, with the maximum achieved at K/Mo ratio of 0.8, while alcohol selectivity monotonically increases with K/Mo ratio. It is tentatively proposed that the surface [open quotes]K-Mo-S[close quotes] species and Mo(CUS) sites are responsible for the alcohol and hydrocarbon formations, respectively. The high C[sub 2+]OH/C[sub 1]OH ratio in the alcohol product distribution is probably due to the substantial amount of the SH species present on the surface of the sulfided samples during reaction. 42 refs., 10 figs.« less

Authors:
; ;  [1]
  1. Univ. of Science and Technology of China, Hefei (China)
Publication Date:
OSTI Identifier:
6798076
Resource Type:
Journal Article
Journal Name:
Journal of Catalysis; (United States)
Additional Journal Information:
Journal Volume: 146:1; Journal ID: ISSN 0021-9517
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 10 SYNTHETIC FUELS; ALCOHOLS; CHEMICAL PREPARATION; ALUMINIUM OXIDES; CATALYTIC EFFECTS; MOLYBDENUM OXIDES; POTASSIUM; SYNTHESIS GAS; CHEMICAL REACTIONS; CARBON MONOXIDE; CATALYST SUPPORTS; ELECTRON SPIN RESONANCE; HYDROGEN; PHOTOELECTRON SPECTROSCOPY; TEMPERATURE DEPENDENCE; X-RAY SPECTROSCOPY; ALKALI METALS; ALUMINIUM COMPOUNDS; CARBON COMPOUNDS; CARBON OXIDES; CHALCOGENIDES; ELECTRON SPECTROSCOPY; ELEMENTS; FLUIDS; GASES; HYDROXY COMPOUNDS; MAGNETIC RESONANCE; METALS; MOLYBDENUM COMPOUNDS; NONMETALS; ORGANIC COMPOUNDS; OXIDES; OXYGEN COMPOUNDS; REFRACTORY METAL COMPOUNDS; RESONANCE; SPECTROSCOPY; SYNTHESIS; TRANSITION ELEMENT COMPOUNDS; 400201* - Chemical & Physicochemical Properties; 100200 - Synthetic Fuels- Production- (1990-)

Citation Formats

Jiang, Ming, Bian, Guo-Zhu, and Fu, Yi-Lu. Effect of the K-Mo interaction in K-MoO[sub 3]/[gamma]-Al[sub 2]O[sub 3] catalysts on the properties of alcohol synthesis from syngas. United States: N. p., 1994. Web. doi:10.1016/0021-9517(94)90017-5.
Jiang, Ming, Bian, Guo-Zhu, & Fu, Yi-Lu. Effect of the K-Mo interaction in K-MoO[sub 3]/[gamma]-Al[sub 2]O[sub 3] catalysts on the properties of alcohol synthesis from syngas. United States. doi:10.1016/0021-9517(94)90017-5.
Jiang, Ming, Bian, Guo-Zhu, and Fu, Yi-Lu. Tue . "Effect of the K-Mo interaction in K-MoO[sub 3]/[gamma]-Al[sub 2]O[sub 3] catalysts on the properties of alcohol synthesis from syngas". United States. doi:10.1016/0021-9517(94)90017-5.
@article{osti_6798076,
title = {Effect of the K-Mo interaction in K-MoO[sub 3]/[gamma]-Al[sub 2]O[sub 3] catalysts on the properties of alcohol synthesis from syngas},
author = {Jiang, Ming and Bian, Guo-Zhu and Fu, Yi-Lu},
abstractNote = {A series of K-MoO[sub 3]/[gamma]-Al[sub 2]O[sub 3] catalysts was prepared by varying the K/Mo atomic ratios between 0 and 1.5, maintaining molybdenum content as constant. The structures of the samples were characterized by several techniques (LRS, XRD, XPS, ESR, TPR, O[sub 2], CO and H[sub 2] chemisorption, and TPD) and accounted for the catalytic properties for alcohol synthesis from synthesis gas. It is revealed that for the potassium-promoted samples and interaction between the potassium promoter and the supported molybdenum component occurs. The amount of the species resulting from this interaction gets saturated at a K/Mo ratio of 0.8. On the oxidic samples, K-Mo interaction species which may contain potassium cations and an Mo[sub 7]O[sup 6[minus][sub 24]] unit are formed. This retards, to some extent, the sulfidation and reduction of Mo(VI) to Mo(IV). The sulfidation of the interaction species leads to the aggregation of MoS[sub 2] and the formation of surface [open quotes]K-Mo-S[close quotes] species. At K/Mo ratios above 0.8, KCl crystallites form; some amount of KCl, which is not aggregated, covers the exposed molybdenum surface, and decreases the amount of [open quotes]K-Mo-S[close quotes] species and Mo(CUS) sites. The activity toward alcohol formation over the sulfided samples is in parallel with the extent of the K-Mo interaction, with the maximum achieved at K/Mo ratio of 0.8, while alcohol selectivity monotonically increases with K/Mo ratio. It is tentatively proposed that the surface [open quotes]K-Mo-S[close quotes] species and Mo(CUS) sites are responsible for the alcohol and hydrocarbon formations, respectively. The high C[sub 2+]OH/C[sub 1]OH ratio in the alcohol product distribution is probably due to the substantial amount of the SH species present on the surface of the sulfided samples during reaction. 42 refs., 10 figs.},
doi = {10.1016/0021-9517(94)90017-5},
journal = {Journal of Catalysis; (United States)},
issn = {0021-9517},
number = ,
volume = 146:1,
place = {United States},
year = {1994},
month = {3}
}