Transient distributions of composition and temperature in a gas–solid packed bed reactor by near-infrared tomography

Deactivation of the preferential oxidation of CO in packed bed reactor by 3D modelling and near-infrared tomography

“…This helped to understand the phenomena of mass and heat transfers between the core and near-the-wall regions of PBRs of low AR. [16][17][18] Herein, the dynamic deactivation of the Fe-Pt/γ-Al2O3 catalyst during the PROX of CO was followed by screening the spatial maps of H2OV produced via hydrogen oxidation and potentially the r-WGS reaction. It was not possible to observe other species, as their optical absorption coefficients are of two to three magnitudes lower than those of H2OV in the NIR range.…”

“…The ballistic light follows a straight trajectory in the medium, the quasi-ballistic light carries out minor scattering, while the diffuse light goes through multiple scattering and directions. [16][17][18] The ballistic light therefore travels straight through a non-transparent medium and exits in a similar direction to that in which it entered, but constitutes typically a very small part of the light. The concentration of H2OV was obtained by measuring the attenuation of the light through the low scattering PBR, which included both absorption and some scattering and is described by the modified Beer-Lambert law.…”

“…The 2D technique was then extended to optical tomography for a semi-opaque packed bed adsorber of water vapour and PBR of hydrogen isotopic exchange process. [16][17][18]. NIR optical tomography has emerged in the recent years owing to developments in the laser technology for the telecommunication sector and imaging sensors of 2D array detectors, allowing the technique to be operated at spatiotemporal resolutions of sub-millimetres and sub-seconds.…”

Simultaneous microscopic measurements of thermal and spectroscopic fields of a phase change material

“…Noninvasive techniques based on imaging or optics are emerging technologies that have recently been applied for the characterization of complex systems, such as for gas concentration measurements in a gas−solid fluidized bed [7] and for the measure- [8]. The imaging technique was used to perform three dimensional measurements using the spatial rotation of the samples in the near−infrared domain, and tomography was used to observe the dynamic behavior of flowing gases on a packed bed reactor [9]. In the terahertz domain, tomography was used to reconstruct the bone structure of the body [10].…”

Kinetics and reactive stripping modelling of hydrogen isotopic exchange of deuterated waters

“…The catalytic reaction (1) is known to be weakly exothermic (-15.9 J/mol) and preferentially operates at mild temperatures [6]. It is also facilitated by hydrophobic or water-proof catalysts such as platinum, supported on carbons, polytetrafluoroethylene (PTFE) or resins (styrene-divinyl-benzene co-polymer (SDBC)) [8][9][10][11][12][13]. Reaction (2) expresses the liquid/vapour distillation exchange of mixture including water and heavy water isotopologues.…”