Informace o publikaci
Carbon nitride boosts the CO2 methanation activity of Ni/CeO2
| Autoři | |
|---|---|
| Rok publikování | 2025 |
| Druh | Článek v odborném periodiku |
| Časopis / Zdroj | JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING |
| Fakulta / Pracoviště MU | |
| Citace | |
| www | https://www.sciencedirect.com/science/article/pii/S2213343725038497?via%3Dihub#ack0005 |
| Doi | https://doi.org/10.1016/j.jece.2025.119153 |
| Klíčová slova | C3N4; Ceria; Nickel; Methane; CO2 hydrogenation |
| Popis | Selective CO2 methanation using green H-2 offers a promising approach for tackling both energy and environmental challenges. Herein, a Ni/CeO2 catalyst was synthesized using a one-pot method in the presence of sacrificial C3N4 and evaluated for COQ methanation. The catalyst exhibited a high CO2 conversion of 82.6 % and a CH4 production rate of up to 178 mmol g(cat)(-1) h(-1), with high CH4 selectivity (99.4 %) at a remarkably low temperature of 250 degrees C. Surface characterization techniques, including Raman spectroscopy, XPS, P-31-MAS NMR of adsorbed trimethylphosphine, and CO2-TPD, demonstrate that the addition of C3N4 significantly enhanced the concentration of surface oxygen vacancies and medium-strength basic sites. In situ DRIFTS analysis indicated that CO2 methanation over Ni/CeO2 proceeded via the RWGS+CO hydrogenation and formate pathways, with the former being predominant at low temperatures. The exceptional low-temperature methanation performance of this new catalyst is attributed to the increased density of oxygen vacancies and medium-strength basic sites. |