Cold Plasma Synthesis and Testing of NiOX-Based Thin-Film Catalysts for CO2 Methanation
| Autor: | Maciej Fronczak, Hanna Kierzkowska-Pawlak, Magdalena Leśniak, Maciej Sitarz, Ryszard Kapica, Jacek Tyczkowski, Martyna Smolarek |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Chemical technology TP1-1185 Atmospheric temperature range CO2 methanation Ni-based catalysts cold plasma deposition (PECVD) Catalysis law.invention Chemistry X-ray photoelectron spectroscopy Chemical engineering Plasma-enhanced chemical vapor deposition law Methanation Phase (matter) thin-film nanocatalysts nickel oxides Calcination Physical and Theoretical Chemistry Thin film QD1-999 |
| Zdroj: | Catalysts, Vol 11, Iss 905, p 905 (2021) Catalysts Volume 11 Issue 8 |
| ISSN: | 2073-4344 |
| Popis: | An essential problem in managing CO2 and transforming it into methane as a useful fuel is the quest for adequately efficient and cheap catalysts. Another condition is imposed by the new designs of structured reactors, which require catalysts in the form of the thinnest possible films. The aim of this work was to produce Ni-based thin-film catalysts by the cold plasma deposition method (PECVD) from a volatile metal complex (Ni(CO)4) and to study their structure and catalytic properties in the CO2 methanation process. We tested three basic types of films: as-deposited, calcined in Ar, and calcined in air. The nanostructure and molecular structure of the films were investigated by electron microscopy (SEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The catalytic activity was evaluated in the methanation process (CO2 + H2), which was performed in a tubular reactor operating in the temperature range of 300–400 °C. The films calcined in air showed the highest activity in this process but behaved unstably. However, their regeneration by recalcination in air restored the initial catalytic activity. An important conclusion emerged from the obtained results, namely that the active phase in the tested films is Ni3+ (most likely in the form of Ni2O3), contrary to the common opinion that this phase is metallic Ni0. In our case, Ni0 quenches the catalytic activity. |
| Databáze: | OpenAIRE |
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