A promising CO<sub>2</sub> methanation catalyst system based on modified halloysites as supports
<p dir="ltr">Earth’s climate is warming due to anthropogenic emissions of greenhouse gases, especially carbon dioxide (CO2). Different reactions are allocated to mitigate the CO<sub>2</sub> in the atmosphere. However, CO<sub>2</sub> methanation is a pivotal re...
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2025
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| Summary: | <p dir="ltr">Earth’s climate is warming due to anthropogenic emissions of greenhouse gases, especially carbon dioxide (CO2). Different reactions are allocated to mitigate the CO<sub>2</sub> in the atmosphere. However, CO<sub>2</sub> methanation is a pivotal research hotspot due to its ability to produce methane at low operating temperatures (200–400 °C). Halloysite nanotubes (HNTs)-based catalysts have attracted significant attention in various catalytic applications. However, Halloysite is rarely reported for thermal CO<sub>2</sub> methanation. The selected halloysite clay was modified first using the 3-Aminopropyl triethoxy silane (NH2) as coupling agent, the resulting materials (HNTs), and then doped with Ni at different weight concentrations (5%, 10%, 20%, 40%, 50%). materials can offer high surface area and porous structure, which can improve metal dispersion. The prepared Ni/HNTs catalysts were characterized using various techniques, such as XRD, XPS, SEM, and TEM, which confirmed the existence of nanotubes and porous structures. The propensity of the prepared Ni/HNTs were evaluated to catalyse the CO<sub>2</sub> methanation reactions at a temperature range of 250 to 500 ̊C. The catalyst containing 20 wt.% of Ni (20Ni/HNTs) showed the highest CO<sub>2</sub> conversion at all reaction temperatures and the highest selectivity of methane at 450 °C (82%). This study paves the way for the large utilization of the HNTs as a strong support for different metals used in thermal catalytic reactions, not limited to the CO<sub>2</sub> methanation.</p><h2>Other Information</h2><p dir="ltr">Published in: Emergent Materials<br>License: <a href="https://creativecommons.org/licenses/by/4.0" target="_blank">https://creativecommons.org/licenses/by/4.0</a><br>See article on publisher's website: <a href="https://dx.doi.org/10.1007/s42247-024-00929-1" target="_blank">https://dx.doi.org/10.1007/s42247-024-00929-1</a></p> |
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