Nickel nanoparticles supported on nitrogen–doped carbon nanotubes are a highly active, selective and stable CO2 methanation catalyst
| Autor: | Julian Gödde, Martin Muhler, Mariia Merko, Wei Xia |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Energy Engineering and Power Technology Nanoparticle chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences law.invention Catalysis Nickel Fuel Technology Chemical engineering chemistry law Chemisorption Methanation Electrochemistry Calcination 0210 nano-technology Selectivity Energy (miscellaneous) Space velocity |
| Zdroj: | Journal of Energy Chemistry. 54:323-331 |
| ISSN: | 2095-4956 |
| DOI: | 10.1016/j.jechem.2020.06.007 |
| Popis: | CO2 methanation using nickel-based catalysts has attracted large interest as a promising power-to-gas route. Ni nanoparticles supported on nitrogen-doped CNTs with Ni loadings in the range from 10 wt% to 50 wt% were synthesized by impregnation, calcination and reduction and characterized by elemental analysis, X-ray powder diffraction, H2 temperature-programmed reduction, CO pulse chemisorption and transmission electron microscopy. The Ni/NCNT catalysts were highly active in CO2 methanation at atmospheric pressure, reaching over 50% CO2 conversion and over 95% CH4 selectivity at 340 °C and a GHSV of 50,000 mL g−1 h−1 under kinetically controlled conditions. The small Ni particle sizes below 10 nm despite the high Ni loading is ascribed to the efficient anchoring on the N-doped CNTs. The optimum loading of 30 wt%–40 wt% Ni was found to result in the highest Ni surface area, the highest degree of conversion and the highest selectivity to methane. A constant TOF of 0.3 s−1 was obtained indicating similar catalytic properties of the Ni nanoparticles in the range from 10 wt% to 50 wt% Ni loading. Long-term experiments showed that the Ni/NCNT catalyst with 30 wt% Ni was highly stable for 100 h time on stream. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect