Design, modelling, and application of a low void-volume in situ diffuse reflectance spectroscopic reaction cell for transient catalytic studies
Literature Information
Ed Atchison, Hongda Zhu
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.
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Source Journal
Reaction Chemistry & Engineering

Reaction Chemistry & Engineering is an interdisciplinary journal reporting cutting-edge research focused on enhancing the understanding and efficiency of reactions. Reaction engineering leverages the interface where fundamental molecular chemistry meets chemical engineering and technology. Challenges in chemistry can be overcome by the application of new technologies, while engineers may find improved solutions for process development from the latest developments in reaction chemistry. Reaction Chemistry & Engineering is a unique forum for researchers whose interests span the broad areas of chemical engineering and chemical sciences to come together in solving problems of importance to wider society. All papers should be written to be approachable by readers across the engineering and chemical sciences. Papers that consider multiple scales, from the laboratory up to and including plant scale, are particularly encouraged.



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