The role of Lewis acidic vanadium centers in DME steam reforming over V-Ni catalysts
| Autor: | K. Antoniak-Jurak, María Ángeles Larrubia, Izabela S. Pieta, Concepción Herrera, Rafael González-Gil, Piotr Pieta, Agnieszka Lewalska-Graczyk, Luis J. Alemany, Robert Nowakowski, Paweł Kowalik |
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| Rok vydání: | 2021 |
| Předmět: |
General Chemical Engineering
Inorganic chemistry Vanadium chemistry.chemical_element 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Decomposition Industrial and Manufacturing Engineering Methane 0104 chemical sciences Catalysis Steam reforming chemistry.chemical_compound chemistry Environmental Chemistry Dimethyl ether Lewis acids and bases Methanol 0210 nano-technology |
| Zdroj: | Chemical Engineering Journal. 423:129996 |
| ISSN: | 1385-8947 |
| DOI: | 10.1016/j.cej.2021.129996 |
| Popis: | Dimethyl ether (DME) as a potential chemical storage of renewable energy was studied for decomposition and steam reforming (DME SR) to produce hydrogen-rich streams over V-Ni/Al2O3 catalysts. The extent of DME decomposition, DME hydrolysis, and subsequent methanol steam reforming was examined during this study, focusing on the redox and acid/base properties of catalyst surface species. The results show that the DME SR performance depended on the acid-redox character of the Ni-O-Ni/V-O-Ni species dispersed onto alumina. For S/C ratio close to 2.5, for relative V-rich catalysts, DME hydrolysis reaction over the Lewis acid sites was found a rate-determining step and then, metallic centers being responsible for H2 and CO2 production. For 3V-Ni/Al2O3 DME SR with low selectivity towards methane and direct H2 and CO2 production (H2/CO2 ratios close to 3), with near-complete DME conversion was obtained above 673 K. |
| Databáze: | OpenAIRE |
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