Intensified microwave-assisted heterogeneous catalytic reactors for sustainable chemical manufacturing
| Autor: | Jesus Santamaria, Jose M. Catala-Civera, Kewei Yu, Dionisios G. Vlachos, Weiqing Zheng, Pedro J. Plaza-Gonzalez, Weiqi Chen, Abhinav Malhotra |
|---|---|
| Přispěvatelé: | Department of Energy (US) |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
General Chemical Engineering Pellets Sustainable manufacturing 02 engineering and technology 010402 general chemistry 01 natural sciences Industrial and Manufacturing Engineering Methane Catalysis chemistry.chemical_compound Packed monolith TEORIA DE LA SEÑAL Y COMUNICACIONES Environmental Chemistry Dehydrogenation Monolith geography geography.geographical_feature_category Carbon dioxide reforming General Chemistry Dissipation Natural gas 021001 nanoscience & nanotechnology 0104 chemical sciences Chemical engineering chemistry Microwave-assisted catalysis 0210 nano-technology Microwave |
| Zdroj: | RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia instname Digital.CSIC. Repositorio Institucional del CSIC |
| DOI: | 10.1016/j.cej.2021.130476 |
| Popis: | Microwave-assisted catalysis is an emerging route for reactor modularization and decarbonization of chemical manufacturing with energy-intensive reactions. While laboratory-scale microwave-assisted heterogeneous catalytic reactors are being developed, hot spots and reactor stability under increased catalyst inventory remain impediments for high throughput processing. Here, we engineer the electromagnetic field-material interactions by introducing a packed monolith configuration, consisting of a microwave absorbing monolith filled with catalytic pellets. Electromagnetic simulations reveal the crucial role of monolith electrical conductivity in diminishing the local power dissipation between the pellets' contact points by absorbing the heat directly. Compared to traditional fixed beds, where hot spots form within minutes of operation, and catalyst-coated monoliths, whose active catalyst loading is limited, the proposed system is stable at all tested temperatures up to 900 °C and has a catalyst packing density near that of fixed beds. We demonstrate its versatility first on the ethane dehydrogenation to produce ethylene over a Ga2O3/Al2O3 catalyst. Repeatable performance over multiple cycles of reaction and regeneration highlights long-term operation. Second, the dry reforming of methane (CH4) is carried out over a commercial Rh/Al2O3 catalyst, achieving a high (~86%) CH4 conversion with an order of magnitude higher H2 throughput (~85 m3/kg/hr) than previous laboratory-scale reactors. By enhancing the catalyst inventory, packed monoliths create a potential avenue for broader adoption of microwave-assisted heterogeneous catalytic reactors. This work was supported by the Department of Energy's Office of Energy Efficiency and Renewable Energy Advanced Manufacturing Office under Award Number DE-EE0007888-8.3. The authors gratefully acknowledge Keiji Adachi from Ibiden USA for providing the SiC monolith sample and Jaynell Keely for assistance with graphics. |
| Databáze: | OpenAIRE |
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