Improvement of Ni/Al2O3catalysts for low-temperature CO2methanation by vanadium and calcium oxide addition
| Autor: | Piotr Pieta, Agnieszka Lewalska-Graczyk, Robert Nowakowski, Paweł Kowalik, Gabriella Garbarino, Katarzyna Antoniak-Jurak, Paola Riani, Izabela S. Pieta, Guido Busca, Wojciech Lisowski |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
General Chemical Engineering Aluminate Non-blocking I/O Vanadium chemistry.chemical_element 02 engineering and technology General Chemistry 021001 nanoscience & nanotechnology Industrial and Manufacturing Engineering Catalysis chemistry.chemical_compound 020401 chemical engineering chemistry X-ray photoelectron spectroscopy Chemical engineering Methanation 0204 chemical engineering 0210 nano-technology Calcium oxide Solid solution |
| Popis: | CO₂ methanation is a very promising technology for the production of alternative fuels with the simultaneous use of greenhouse gases. Therefore, intensive research is carried out on the optimization of catalysts with excellent properties for operation in the area of low temperatures. Here, we present research on a catalyst composed of 19 wt % NiO supported on alumina/calcium aluminate. The catalyst was modified with V₂O₅ in order to be suited for extrusion and scale-up in the frame of power to gas technology. Samples with various vanadium contents (Ni–xV, where x represents the amount of vanadium) were prepared in the form of ground granules obtained from 0.5 mm diameter spherical grains. X-ray diffraction (XRD), transmission electron microscopy (TEM), skeletal infrared (IR), diffuse reflectance ultraviolet–visible-near-infrared (DR-UV–vis-NIR), and X-ray photoelectron (XPS) spectroscopies, as well as H₂ temperature-programmed reduction (H₂-TPR), were used to characterize the samples. Catalytic performances of the catalyst samples were tested in CO₂ hydrogenation at 1 atm. Among the many supported Ni catalysts tested in our laboratories, the catalysts of 0.5 and 1 wt % V showed very high activity, with the highest CH₄ yield of 97% at 623 K. These catalysts exhibited 100% CH₄ selectivity up to 673 K. The excellent performances of the studied catalysts are attributed to the possible formation of Ni–V solid solution alloy nanoparticles. |
| Databáze: | OpenAIRE |
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