Design, modelling, and application of a low void-volume in situ diffuse reflectance spectroscopic reaction cell for transient catalytic studies
| Autor: | Ed Atchison, Priya D. Srinivasan, Juan J. Bravo-Suárez, Bhagyesha S. Patil, Hongda Zhu |
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| Rok vydání: | 2019 |
| Předmět: |
Fluid Flow and Transfer Processes
In situ Materials science 010405 organic chemistry Process Chemistry and Technology Analytical chemistry Infrared spectroscopy 010402 general chemistry Residence time distribution Residence time (fluid dynamics) 01 natural sciences Catalysis 0104 chemical sciences chemistry.chemical_compound chemistry Chemistry (miscellaneous) Chemical Engineering (miscellaneous) SN2 reaction Diffuse reflection Diethyl ether |
| Zdroj: | Reaction Chemistry & Engineering. 4:667-678 |
| ISSN: | 2058-9883 |
| Popis: | This paper describes a new low void-volume in situ reaction cell for use in diffuse reflectance spectroscopic studies. It was demonstrated by means of a residence time distribution analysis that the cell's average gas residence time was relatively small (∼1.3 s) and within the time scale of rapid scan spectra sampling. Such combination enabled the rigorous implementation of transient periodic techniques such as modulation excitation-phase sensitive detection-diffuse reflectance Fourier infrared spectroscopy (ME-PSD-DRIFTS), which allowed unique access to surface reaction intermediates in gas–solid reactions. Application of the new cell and ME-PSD-DRIFTS to the conversion of ethanol on γ-Al2O3 at 200 °C demonstrated the presence of likely surface intermediate species that conform with ethanol conversion to diethyl ether via a SN2 mechanism and the involvement of several alumina hydroxyl types as possible active sites. |
| Databáze: | OpenAIRE |
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