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Low temperature CO2 methanation on hydrothermal synthesis of Ni-Ba/Sm2O3 catalysts
- Source :
- Sustainable Chemistry for Climate Action, Vol 3, Iss , Pp 100032- (2023)
- Publication Year :
- 2023
- Publisher :
- Elsevier, 2023.
-
Abstract
- A low temperature CO2 methanation is a thermodynamically favorable route to produce highly selective methane while preventing catalyst deactivation. Ni-Ba/Sm2O3 catalysts synthesized using one-pot hydrothermal method exhibited enhanced reducibility with high CO2 adsorption capacity to achieve CO2 conversion at low temperatures. CO2 conversion occurred at 200 °C with 5% conversion, progressively increasing to reach equilibrium at 400 °C with 100% selectivity to methane. BaO promotes surface oxygen vacancy in Sm2O3, which is responsible for forming bidentate formate species during CO2 methanation. Comparative DRIFTS analysis with Ni-Ba/Sm2O3 synthesized using impregnation indicates the catalysts followed different mechanistic pathways depending on the amount of surface oxygen vacancy generated by BaO/Sm2O3 proximity.
Details
- Language :
- English
- ISSN :
- 27728269
- Volume :
- 3
- Issue :
- 100032-
- Database :
- Directory of Open Access Journals
- Journal :
- Sustainable Chemistry for Climate Action
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.18eee32532ac4e9ca2297c0058119902
- Document Type :
- article
- Full Text :
- https://doi.org/10.1016/j.scca.2023.100032