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Spatially Resolved Operando Measurements in Heterogeneous Catalytic Reactors, Volume 50: Imaging Gas Flow in Gas–Solid Catalytic Systems by Near-Infrared Tomography

Research output: Contribution in Book/Report/Proceedings - With ISBN/ISSNChapter

Published
Publication date17/11/2017
Host publicationSpatially Resolved Operando Measurements in Heterogeneous Catalytic Reactors
EditorsAnthony Dixon, Olaf Deutschmann
PublisherAcademic Press
Pages203-280
Number of pages78
ISBN (Electronic)9780128125908
ISBN (Print)9780128125892
Original languageEnglish

Publication series

NameAdvances in Chemical Engineering
PublisherElsevier
Volume50

Abstract

Near-infrared imaging of 2D and 3D spatial resolutions allowed access to behavior of flowing gases and catalyst activity by measuring spatial distribution of composition and temperature in packed beds of low light scattering, subject to wall effects, and nonisothermal conditions. Water vapor was used as tracing species owing to high absorption coefficient in the near-infrared spectrum. Heterogeneous distribution of activity, flow maldistribution, and dynamic lags between the local mixing zones were observed and quantified. The uneven distribution of concentration and temperature highlighted the importance of mass and heat transport at gas–solid boundaries. The spatial resolution
of near-infrared imaging was of importance to give reliable profiles of physical data, and dispersion coefficients and local activity were cited as examples of acceptable validation.
The results were a proven stage for further developments, particularly those
anticipated with infrared technology. However, key to that would be the development of affordable tunable lasers, optical accessories, and focal planar array sensors of similar sensitivities to those available in the near-infrared spectrum, allowing the technique to be applied to packed beds and other nontransparent reactive media.