Modeling and experimental study of hollow cylindrical catalysts for prediction of transient behaviors of suspension photoreaction systems by Langmuir-Hinshelwood kinetics

Cho, Young-Sang; Nguyen, Thị Thu Hien; Nguyen, Hoai Han; Tran, Quang Hai

doi:10.1016/j.cattod.2023.114345

Cited by 1 publication

(1 citation statement)

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“…From this point of view, nanostructured catalysts are preferred [10]. Another preferred option is using arrays of numerous tubes [11][12][13], with nanotubes yielding even more impressive results [14]. The gaseous molecules enter the tube on one side and are transferred through the tube by a pressure gradient.…”

Section: Introductionmentioning

confidence: 99%

The penetration depth of atomic radicals in tubes with catalytic surface properties

PAUL,

MOZETIČ,

ZAPLOTNIK

et al. 2024

Plasma Sci. Technol.

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Catalysis of molecular radicals is often performed in interesting experimental configurations. One possible configuration is tubular geometry. The radicals are introduced into the tubes on one side, and stable molecules are exhausted on the other side. The penetration depth of radicals depends on numerous parameters, so it is not always feasible to calculate it. This article presents systematic measurements of the penetration depth of oxygen atoms along tubes made from nickel, cobalt, and copper. The source of O atoms was a surfatron-type microwave plasma. The initial density of O atoms depended on the gas flow and was 0.7, 2.4, and 4.2 〖∙10〗^21 m^(-3) at the flow rates of 50, 300, and 600 sccm, and pressure of 10, 35, and 60 Pa, respectively. The gas temperature remained at room temperature throughout the experiments. The dissociation fraction decreased exponentially along the length of the tubes in all cases. The penetration depths for well-oxidized nickel were 1.2, 1.7, and 2.4 cm, respectively. For cobalt, they were slightly lower at 1.0, 1.3, and 1.6 cm, respectively, while for copper, they were 1.1, 1.3, and 1.7 cm, respectively. The results were explained by gas dynamics and heterogeneous surface association. These data are useful in any attempt to estimate the loss of molecular fragments along tubes, which serve as catalysts for the association of various radicals to stable molecules.

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