Bubble formation in catalyst pores; curse or blessing?
| Autor: | Roger Brunet Espinosa, Leon Lefferts, Frieder Mugele, Daniël Wijnperle, Michel H. G. Duits |
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| Přispěvatelé: | Catalytic Processes and Materials, Physics of Complex Fluids |
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Bubble Diffusion 02 engineering and technology 010402 general chemistry Heterogeneous catalysis 01 natural sciences Catalysis law.invention Reaction rate Optical microscope law Chemical Engineering (miscellaneous) Bubble formation model catalyst Fluid Flow and Transfer Processes Process Chemistry and Technology 021001 nanoscience & nanotechnology 0104 chemical sciences Chemical engineering Chemistry (miscellaneous) hydrogen peroxide decomposition Liquid bubble Microreactor 0210 nano-technology |
| Zdroj: | Reaction chemistry & engineering, 3(5), 826-833. Royal Society of Chemistry |
| ISSN: | 2058-9883 |
| DOI: | 10.1039/c8re00110c |
| Popis: | H2O2 decomposition experiments on Pt were performed in a glass microreactor, simulating arrays of catalyst pores. The formation of bubbles inside the model nanopores was observed with an optical microscope. It was found that the bubble initiation time strongly depends on the diffusion length and the H2O2 concentration. The amount of catalyst did not have a significant effect, suggesting that the reaction is diffusion limited. Results show that bubble formation can decrease the reaction rate by physically blocking the active sites, but also can accelerate the reaction by creating a forced convective flow inside the nanochannels due to bubble migration. Similar behaviour is likely to occur in a real catalyst and thus, a smart design of the catalytic support could be used to enhance reaction rates. |
| Databáze: | OpenAIRE |
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