| Autor: |
F. Zhang, J. A. Rodriguez, S. D. Senanayake, Z. Liu |
| Rok vydání: |
2019 |
| Předmět: |
|
| DOI: |
10.1039/9781788016971-00198 |
| Popis: |
Research focussed on in situ studies for the activation and conversion of methane on well-defined metal-oxide surfaces is reviewed. In recent years, experiments with single-crystal surfaces and well-ordered films have increased our understanding of the interaction of methane with solid surfaces. Late transition metals interact weakly with methane and elevated temperatures (>400 K) are necessary to enable a significant dissociation on the hydrocarbon. In contrast, an IrO2(110) surface dissociates methane at temperatures below 200 K. Cooperative interactions between O and Ir are responsible for the binding of methane and the breaking of a C–H bond. This type of cooperative interactions involving O and a metal cation have also been seen on Ni/CeO2(111) and Co/CeO2(111) surfaces which dissociate methane at room temperature. Experiments of AP-XPS and in situ TR-XRD have shown that the active phase of metal/oxide catalysts used for the dry-reforming of methane frequently is a dynamic entity which evolves when the reaction conditions change. The addition of water to a mixture of CH4/O2 shifts the selectivity towards methanol production on CeO2/CuOx/Cu(111) and Ni/CeO2(111) surfaces. Metal-support interactions and water site-blocking play a crucial role in the conversion of methane to methanol on these catalysts. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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