| Autor: |
Leander Haug, Christoph Thurner, Maged F. Bekheet, Kevin Ploner, Benjamin Bischoff, Aleksander Gurlo, Martin Kunz, Bernhard Sartory, Simon Penner, Bernhard Klötzer |
| Jazyk: |
angličtina |
| Rok vydání: |
2023 |
| Předmět: |
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| Zdroj: |
Catalysts, Vol 13, Iss 5, p 804 (2023) |
| Druh dokumentu: |
article |
| ISSN: |
2073-4344 |
| DOI: |
10.3390/catal13050804 |
| Popis: |
To identify the synergistic action of differently prepared Ni-ZrO2 phase boundaries in methane dry reforming, we compared an “inverse” near-surface intermetallic NiZr catalyst precursor with the respective bulk-intermetallic NixZry material and a supported Ni-ZrO2 catalyst. In all three cases, stable and high methane dry reforming activity with enhanced anticoking properties can be assigned to the presence of extended Ni-ZrO2 phase boundaries, which result from in situ activation of the intermetallic Ni-Zr model catalyst systems under DRM conditions. All three catalysts operate bifunctionally; methane is essentially decomposed to carbon at the metallic Ni0 surface sites, whereas CO2 reacts to CO at reduced Zr centers induced by a spillover of carbon to the phase boundaries. On pure bulk Ni0, dissolved carbon accumulates in surface-near regions, leading to a sufficiently supersaturated state for completely surface-blocking graphitic carbon segregation. In strong contrast, surface-ZrO2 modified bulk Ni0 exhibits virtually the best decoking and carbon conversion conditions due to the presence of highly dispersed ZrO2 islands with a particularly large contribution of interfacial Ni0-ZrO2 sites and short C-diffusion pathways to the latter. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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