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Design, modelling, and application of a low void-volume in situ diffuse reflectance spectroscopic reaction cell for transient catalytic studies

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Abstract

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.

Graphical abstract: Design, modelling, and application of a low void-volume in situ diffuse reflectance spectroscopic reaction cell for transient catalytic studies

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Publication details

The article was received on 14 Nov 2018, accepted on 19 Dec 2018 and first published on 22 Dec 2018


Article type: Paper
DOI: 10.1039/C8RE00302E
Citation: React. Chem. Eng., 2019, Advance Article

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    Design, modelling, and application of a low void-volume in situ diffuse reflectance spectroscopic reaction cell for transient catalytic studies

    B. S. Patil, P. D. Srinivasan, E. Atchison, H. Zhu and J. J. Bravo-Suárez, React. Chem. Eng., 2019, Advance Article , DOI: 10.1039/C8RE00302E

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