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Effects of preparation conditions on the CO methanation performance of Co-Mo carbide catalysts

Authors
Kim, Jae-MinKim, Sung-HyunPark, Sung-YoulKim, Seong-SooLee, Seung-Jae
Issue Date
14-12월-2019
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Keywords
Cobalt molybdenum carbide; Activated charcoal; Wet impregnation; pH; Initial Co/Mo molar ratio
Citation
CHEMICAL ENGINEERING SCIENCE, v.209
Indexed
SCIE
SCOPUS
Journal Title
CHEMICAL ENGINEERING SCIENCE
Volume
209
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/60923
DOI
10.1016/j.ces.2019.115219
ISSN
0009-2509
Abstract
We prepared activated charcoal-supported Co-Mo carbide catalysts to investigate the effects of solution pH and initial Co/Mo molar ratio. In the absence of Co, no Mo adsorption was observed at pH above the pH(zpc) of AC, whereas the introduction of Co at pH > 6 resulted in the co-precipitation of Mo and Co and facilitated Mo adsorption. CO conversions for CO methanation at 400 degrees C and 30 bar achieved over samples prepared at pH 3 were initially high but decreased with increasing reaction time, whereas CO conversions were maintained at >90% with increasing reaction time for samples prepared at pH > 6. XPS analysis of these high-performance catalysts revealed that the predominant state of surface Mo was Mo-0 rather than Mo4+ and Mo6+. Catalysts with maximum methanation activity, i.e., those with the highest surface Mo-0 content, were obtained at pH 7 and an initial Co/Mo molar ratio of 1.0. (C) 2019 Elsevier Ltd. All rights reserved.
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