Effects of promoters (Mg, Zr, Y, Ce) on LDH-derived NiAl nanosheets for low-temperature CO2 methanation
1
Issued Date
2026-02-13
Resource Type
ISSN
03603199
Scopus ID
2-s2.0-105027570841
Journal Title
International Journal of Hydrogen Energy
Volume
209
Rights Holder(s)
SCOPUS
Bibliographic Citation
International Journal of Hydrogen Energy Vol.209 (2026)
Suggested Citation
Sivakumar M., Kunthakudee N., Srifa A., Gebreegziabher H.G., Rungtaweevoranit B., Fukuhara C., Ratchahat S. Effects of promoters (Mg, Zr, Y, Ce) on LDH-derived NiAl nanosheets for low-temperature CO2 methanation. International Journal of Hydrogen Energy Vol.209 (2026). doi:10.1016/j.ijhydene.2026.153523 Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/114455
Title
Effects of promoters (Mg, Zr, Y, Ce) on LDH-derived NiAl nanosheets for low-temperature CO2 methanation
Corresponding Author(s)
Other Contributor(s)
Abstract
Development of highly active Ni-based catalysts for low-temperature CO<inf>2</inf> methanation is challenging. In this work, layered double hydroxides (LDHs) with nanosheet structure are employed as effective catalyst precursors. The X-promoter doped NiAl catalysts derived from LDH precursors (X: Mg, Zr, Y, Ce) were synthesized by one-pot hydrothermal method. The catalytic performance of prepared catalysts was evaluated with CO<inf>2</inf> methanation. Among various promoters, the Ce–NiAl catalyst exhibits the highest methanation activity at low temperature, achieving CO<inf>2</inf> conversion of 90 % at 210 °C and GHSV of 16000 cm<sup>3</sup> g<sup>−1</sup> h<sup>−1</sup>, compared to Y–NiAl (85 %), Zr–NiAl (75 %), Mg–NiAl (29 %) and pristine NiAl (25 %). The optimized Ce–NiAl catalyst can perform impressive performance in durability test, maintaining CO<inf>2</inf> conversion of 90 % at 210 °C for 200 h. Characterization confirms that the key improved properties are the increased number of weak basic sites and the enhanced concentration of oxygen vacancies, while Ni sintering is suppressed by the preserved strong metal-support interaction. The in-situ DRIFTS experiments reveal that CO<inf>2</inf> molecules converted into bicarbonates and then formates, followed by the formation of CH<inf>4</inf>. The formate pathway is identified as dominant reaction mechanism over the promoted catalyst. This work demonstrates that one-pot hydrothermal is the effective method for the synthesis of Ce–NiAl LDHs, as highly active catalysts for CO<inf>2</inf> methanation at low temperature.