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<p>CO<sub>2</sub> methanation is a promising process for producing methane as a hydrogen carrier while reducing atmospheric CO<sub>2</sub> levels, offering a sustainable pathway for achieving a carbon cycle through the power-to-gas (P2G) system. In this study, a green catalyst for CO<sub>2</sub> methanation was developed using cellulose nanofiber (CNF), a renewable material, as the support. Ni and Mg were dispersed on CNF and subsequently calcined at 500&#xa0;°C to obtain a CNF-derived carbon-supported Ni and Mg catalyst (NiMg/CNF), designed to minimize carbon deposition. NiMg/CNF catalyst exhibited significantly higher CO<sub>2</sub> conversion (~ 85%) and CH<sub>4</sub> selectivity (~ 99%) at 350 °C, compared to a bulk cellulose-supported catalyst. This improved performance was likely attributed to the nanofiber structure of CNF and its abundant oxygen functional groups, which can facilitate metal nanodispersion. TEM analysis confirmed that Ni and Mg were uniformly dispersed as nanoscale particles (&lt; 5&#xa0;nm) on the CNF support. SEM images of the NiMg/CNF revealed curved thin-film sheets interconnected in a three-dimensional network, with large void spaces that can provide effective pathways for mass transport. The NiMg/CNF catalyst maintained relatively stable activity during a 100&#xa0;h continuous reaction, with CO<sub>2</sub> conversion stabilizing around ~ 85% and CH<sub>4</sub> selectivity remaining above 98% until the final stage of the test. XRD pattern of the post-reaction sample closely matched that of the fresh one, indicating that Ni and Mg maintained structural stability on the CNF support.</p>

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Ni-Mg Catalyst Supported on Cellulose Nanofiber Derived Carbon for CO2 Methanation

  • 期刊论文

  • 发表日期：

    2026年1月20日

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  • Rakhmawati Nabila,
  • Corwin Rudly,
  • Soohyun Kim,
  • Hyuk Im,
  • Hokyung Choi,
  • Donghyuk Chun,
  • Sangdo Kim,
  • Jeonghwan Lim,
  • Jiho Yoo

摘要

CO2 methanation is a promising process for producing methane as a hydrogen carrier while reducing atmospheric CO2 levels, offering a sustainable pathway for achieving a carbon cycle through the power-to-gas (P2G) system. In this study, a green catalyst for CO2 methanation was developed using cellulose nanofiber (CNF), a renewable material, as the support. Ni and Mg were dispersed on CNF and subsequently calcined at 500 °C to obtain a CNF-derived carbon-supported Ni and Mg catalyst (NiMg/CNF), designed to minimize carbon deposition. NiMg/CNF catalyst exhibited significantly higher CO2 conversion (~ 85%) and CH4 selectivity (~ 99%) at 350 °C, compared to a bulk cellulose-supported catalyst. This improved performance was likely attributed to the nanofiber structure of CNF and its abundant oxygen functional groups, which can facilitate metal nanodispersion. TEM analysis confirmed that Ni and Mg were uniformly dispersed as nanoscale particles (< 5 nm) on the CNF support. SEM images of the NiMg/CNF revealed curved thin-film sheets interconnected in a three-dimensional network, with large void spaces that can provide effective pathways for mass transport. The NiMg/CNF catalyst maintained relatively stable activity during a 100 h continuous reaction, with CO2 conversion stabilizing around ~ 85% and CH4 selectivity remaining above 98% until the final stage of the test. XRD pattern of the post-reaction sample closely matched that of the fresh one, indicating that Ni and Mg maintained structural stability on the CNF support.