• Title/Summary/Keyword: Activated charcoal-supported molybdenum catalyst

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Direct Methanation of Syngas over Activated Charcoal Supported Molybdenum Catalyst (활성탄 담지 몰리브덴 촉매를 이용한 합성가스 직접 메탄화 반응)

  • KIM, SEONG-SOO;LEE, SEUNG-JAE;PARK, SUNG-YOUL;KIM, JIN-GUL
    • Transactions of the Korean hydrogen and new energy society
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    • v.31 no.5
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    • pp.419-428
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    • 2020
  • The kinetics of direct methanation over activated charcoal-supported molybdenum catalyst at 30 bar was studied in a cylindrical fixed-bed reactor. When the temperature was not higher than 400℃, the CO conversion increased with increasing temperature according to the Arrhenius law of reaction kinetics. While XRD and Raman analysis showed that Mo was present as Mo oxides after reduction or methanation, TEM and XPS analysis showed that Mo2C was formed after methanation depending on the loading of Mo precursor. When the temperature was as high as 500℃, the CO conversion was dependent not only on the Arrhenius law but also on the catalyzed reaction by nanoparticles, which came off from the reactor and thermocouple by metal dusting. These nanoparticles were made of Ni, Fe, Cr and alloy, and attributed to the formation of carbon deposit on the wall of the reactor and on the surface of the thermocouple. The carbon deposit consisted of amorphous and disordered carbon filaments.

A Study on the Effects of pH and Ni/Mo Mole Ratio during Wet Impregnation on the Characteristics and Methane Dry Reforming Reactivity of Activated Charcoal Supported Ni-Mo Carbide Catalyst (습식담지시 pH와 Ni/Mo 몰비가 Ni-Mo/AC 카바이드 촉매의 특성과 메탄건식개질 반응성에 미치는 영향)

  • Lee, Dongmin;Hwang, Unyeon;Park, Hyungsang;Park, Sungyoul;Kim, Seongsoo
    • Transactions of the Korean hydrogen and new energy society
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    • v.25 no.4
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    • pp.344-354
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    • 2014
  • Activated charcoal supported nickel molybdenum carbide (carburized Ni-Mo/AC) catalysts were prepared by wet-impregnation followed by temperature-programmed carburization using 20% $CH_4/H_2$ gas. The effects of pH and initial Ni/Mo mole ratio during wet-impregnation step on the characteristics of the carburized Ni-Mo/AC catalysts were investigated using ICP, XRD, XPS, BET and $CO_2$-TPD techniques, and correlated with the catalytic activity of the carburized Ni-Mo/AC in methane dry reforming reaction. Comparison of the results of methane dry reforming reaction kinetics with the results of characterization of the carburized Ni-Mo/AC catalyst showed that the catalytic activity in methane dry reforming reaction was higher at higher initial Ni/Mo mole ratio or at lower pH(3~natural value). This phenomenon was related to the crystal size of metallic Ni in the carburized Ni-Mo/AC catalyst.