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

Jae Min Kim; Sung Hyun Kim; Sung Youl Park; Seong Soo Kim; Seung Jae Lee

doi:10.1016/j.ces.2019.115219

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

Jae Min Kim, Sung Hyun Kim, Sung Youl Park, Seong Soo Kim, Seung Jae Lee

Research output: Contribution to journal › Article › peer-review

6 Citations (Scopus)

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 °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 Mo⁰ rather than Mo⁴⁺ and Mo⁶⁺. Catalysts with maximum methanation activity, i.e., those with the highest surface Mo⁰ content, were obtained at pH 7 and an initial Co/Mo molar ratio of 1.0.

Original language	English
Article number	115219
Journal	Chemical Engineering Science
Volume	209
DOIs	https://doi.org/10.1016/j.ces.2019.115219
Publication status	Published - 2019 Dec 14

Bibliographical note

Funding Information:
We acknowledge financial support from the R&D Convergence Program (CAP-16-11-KAERI) funded by the NST (National Research Council of Science & Technology) of the Republic of Korea.

Publisher Copyright:
© 2019 Elsevier Ltd

Keywords

Activated charcoal
Cobalt molybdenum carbide
Initial Co/Mo molar ratio
Wet impregnation
pH

ASJC Scopus subject areas

General Chemistry
General Chemical Engineering
Industrial and Manufacturing Engineering

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10.1016/j.ces.2019.115219

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title = "Effects of preparation conditions on the CO methanation performance of Co-Mo carbide catalysts",

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 pHzpc 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 °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 Mo0 rather than Mo4+ and Mo6+. Catalysts with maximum methanation activity, i.e., those with the highest surface Mo0 content, were obtained at pH 7 and an initial Co/Mo molar ratio of 1.0.",

keywords = "Activated charcoal, Cobalt molybdenum carbide, Initial Co/Mo molar ratio, Wet impregnation, pH",

author = "Kim, {Jae Min} and Kim, {Sung Hyun} and Park, {Sung Youl} and Kim, {Seong Soo} and Lee, {Seung Jae}",

note = "Funding Information: We acknowledge financial support from the R&D Convergence Program (CAP-16-11-KAERI) funded by the NST (National Research Council of Science & Technology) of the Republic of Korea. Publisher Copyright: {\textcopyright} 2019 Elsevier Ltd",

year = "2019",

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doi = "10.1016/j.ces.2019.115219",

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AU - Kim, Jae Min

AU - Kim, Sung Hyun

AU - Park, Sung Youl

AU - Kim, Seong Soo

AU - Lee, Seung Jae

N1 - Funding Information: We acknowledge financial support from the R&D Convergence Program (CAP-16-11-KAERI) funded by the NST (National Research Council of Science & Technology) of the Republic of Korea. Publisher Copyright: © 2019 Elsevier Ltd

PY - 2019/12/14

Y1 - 2019/12/14

N2 - 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 pHzpc 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 °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 Mo0 rather than Mo4+ and Mo6+. Catalysts with maximum methanation activity, i.e., those with the highest surface Mo0 content, were obtained at pH 7 and an initial Co/Mo molar ratio of 1.0.

AB - 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 pHzpc 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 °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 Mo0 rather than Mo4+ and Mo6+. Catalysts with maximum methanation activity, i.e., those with the highest surface Mo0 content, were obtained at pH 7 and an initial Co/Mo molar ratio of 1.0.

KW - Activated charcoal

KW - Cobalt molybdenum carbide

KW - Initial Co/Mo molar ratio

KW - Wet impregnation

KW - pH

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DO - 10.1016/j.ces.2019.115219

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

Abstract

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Keywords

ASJC Scopus subject areas

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