Effect of potassium addition method on MoS2 performance for the syngas to alcohol reaction

Authors: D. Ferrari, G. Budroni, L. Bisson, N.J. Rane, B.D. Dickie, J.H. Kang, S.J. Rozeveld

Abstract:
Molybdenum disulfide promoted with alkali metals is one ofthe most studied catalysts for the conversion of synthesis gas to alcohols. In this work, MoS₂ was promoted by adding potassium precursors by physical mixing (PM) and incipient wetness impregnation (IWI) and tested in a small scale reactor. The catalysts prepared by impregnation showed poorer performance compared to the sample prepared by physical mixing of K₂CO₃ and MoS₂. The catalysts were characterized by means of X-ray diffraction, TGA–MS, SEM–EDS, TEM and XPS. The characterization results obtained by SEM–EDS and XRD analyses do not show major differences between the catalysts studied here. In contrast, the TGA results indicated that physical mixing leads to catalysts that lose sulfur at temperatures above 330^◦C and TEM images showed that randomly oriented small MoS₂ crystallites are obtained from PM preparation while IWI preparation gave long MoS₂ crystallites.

Keywords:
Molybdenum sulfide
Syngas to alcohols
Electron microscopy
Catalysis
Alkali doping

Published in: Applied catalysis A: General  (Volumes 462–463, Pages 1-310, 10 July 2013)

Publisher: Elsevier      

ISSN Information: 0926-860X

Effect of potassium addition method on MoS2 performance for the syngas to alcohol reaction

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