Kinetic modelling of the SO2-oxidation with Pt in a microstructured reactor
| Autor: | Roland Dittmeyer, Achim Wenka, Walther Benzinger |
|---|---|
| Rok vydání: | 2011 |
| Předmět: |
Computer simulation
Chemistry Process Chemistry and Technology Thermodynamics Micro process engineering 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Residence time (fluid dynamics) 01 natural sciences 7. Clean energy Catalysis 0104 chemical sciences Catalytic oxidation Fluid dynamics Physical chemistry Microreactor Absorption (chemistry) 0210 nano-technology |
| Zdroj: | Applied Catalysis A: General. 397:209-217 |
| ISSN: | 0926-860X |
| DOI: | 10.1016/j.apcata.2011.03.001 |
| Popis: | In terms of tons per day SO3 is one of the most important chemicals in the world. It is produced via the contact process in a gas phase catalytic oxidation reaction. The contact process consists of multiple catalyst beds, inter-stage cooling and an absorption step in the case of sulphuric acid production. Transferring this process to a microstructured reactor with its unique heat and mass transport properties should make it possible to develop a small scale one pass synthesis well suited for on-site SO3 production, e.g., for surfactant making. In a test reactor experiments were performed with different molar ratios of sulphur dioxide to oxygen, hydrodynamic residence time and reaction temperature. Numerical simulations with ANSYS FLUENT 12.0 were performed for a single channel configuration. For this purpose a detailed model of the flow, the heat distribution and the surface chemistry was used. For the surface chemistry a detailed kinetic model based on elementary steps occurring on the catalyst surface was used. The assumed multi-step mechanism involves coordination of SO2 on two surface sites. The simulations are compared to the experimental results. Good agreement between the model predictions and the experimental results is achieved. A sensitivity analysis was performed to get an idea of the rate determining steps. |
| Databáze: | OpenAIRE |
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