Radial mixing diffusion of hydrogen in a packed-bed type of palladium membrane reactor

Journal Article · Tue Feb 01 04:00:00 EST 1994 · Industrial and Engineering Chemistry Research; (United States)

DOI:https://doi.org/10.1021/ie00026a004· OSTI ID:7206423

Itoh, Naotsugu; Xu, W C; Haraya, Kenji ^[1]

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1. National Inst. of Materials and Chemical Research, Tsukuba (Japan)

A previous study has shown that a tubular packed-bed type of palladium membrane reactor can considerably promote the catalytic dehydrogenation reaction of cyclohexane by selectively separating hydrogen produced in the course of reaction through palladium membrane. Effects of radial diffusion on the hydrogen separation from a low-flow-rate gas mixture containing hydrogen was examined under atmospheric pressure at 473 K using an annular packed-bed type of palladium membrane reactor. The axial profiles of hydrogen concentration (partial pressure) in the packed bed were experimentally measured and mathematically analyzed using two flow models, ideal and radial diffusion models. The ideal flow model could not explain the experimental results very well. On the other hand, the radial diffusion model could successfully simulate the profiles of hydrogen partial pressure formed along the packed bed of palladium membrane reactor. It became clear that there exists a gradient of hydrogen partial pressure in the radial direction of the packed bed due to its permeation through palladium membrane. In addition, Peclet numbers at low Reynolds numbers were determined and were explainable by the extended Wen and Fan equation.

• OSTI ID: 7206423
• Journal Information: Industrial and Engineering Chemistry Research; (United States), Journal Name: Industrial and Engineering Chemistry Research; (United States) Vol. 33:2; ISSN IECRED; ISSN 0888-5885
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020400* -- Petroleum-- Processing
08 HYDROGEN
080100 -- Hydrogen-- Production
ALKANES
CHEMICAL REACTIONS
CYCLOALKANES
CYCLOHEXANE
DEHYDROGENATION
ELEMENTS
FLOW MODELS
HYDROCARBONS
HYDROGEN
MATHEMATICAL MODELS
MEMBRANE TRANSPORT
NONMETALS
ORGANIC COMPOUNDS