Design and synthesis of highly active MoVTeNb-oxides for ethane oxidative dehydrogenation
| Autor: | Maricruz Sanchez-Sanchez, Daniel Melzer, Yuanyuan Zhu, Nigel D. Browning, Klaus Wanninger, Johannes A. Lercher, Gerhard Mestl |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
0301 basic medicine
Materials science Catalyst synthesis Science Oxide General Physics and Astronomy 02 engineering and technology Article General Biochemistry Genetics and Molecular Biology Catalysis Metal 03 medical and health sciences chemistry.chemical_compound Chemical engineering Specific surface area Hydrothermal synthesis Dehydrogenation lcsh:Science Heterogeneous catalysis Multidisciplinary General Chemistry 021001 nanoscience & nanotechnology ddc 030104 developmental biology chemistry visual_art Polyoxometalate visual_art.visual_art_medium Mixed oxide lcsh:Q 0210 nano-technology |
| Zdroj: | Nature Communications, Vol 10, Iss 1, Pp 1-9 (2019) NATURE COMMUNICATIONS Nature Communications |
| ISSN: | 2041-1723 |
| DOI: | 10.1038/s41467-019-11940-0 |
| Popis: | Ethane oxidative dehydrogenation (ODH) is an alternative route for ethene production. Crystalline M1 phase of Mo-V mixed metal oxide is an excellent catalyst for this reaction. Here we show a hydrothermal synthesis method that generates M1 phases with high surface areas starting from poorly soluble metal oxides. Use of organic additives allows control of the concentration of metals in aqueous suspension. Reactions leading to crystalline M1 take place at 190 °C, i.e., approximately 400 °C lower than under current synthesis conditions. The evolution of solvated polyoxometalate ions and crystalline phases in the solid is monitored by spectroscopies. Catalysts prepared by this route show higher ODH activity compared to conventionally prepared catalysts. The higher activity is due not only to the high specific surface area but also to the corrugated lateral termination of the M1 crystals, as seen by atomic resolution electron microscopy, exposing a high concentration of catalytically active sites. Crystalline M1 phase of Mo-V-Te-Nb mixed oxide is an excellent catalyst for ethane oxidative dehydrogenation to ethene. Here, the authors show a method that synthesizes highly active materials by generating M1 crystals with corrugated terminations, thus exposing a large concentration of active sites. |
| Databáze: | OpenAIRE |
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