Two-Flux Radiation-Field Model for an Annular Packed-Bed Photocatalytic Oxidation Reactor

Gregory Raupp, Jill A. Nico, Suneetha Annangi, Rajnish Changrani, Rao Annapragada

Research output: Contribution to journalArticle

55 Citations (Scopus)

Abstract

One of the remaining challenges in application of heterogeneous photocatalysis for treatment of air streams containing dilute VOCs is to design a cost-effective photocatalytic reactor that simultaneously allows efficient contact of the contaminated air and solid catalyst while uniformly irradiating the solid catalyst with light. A pseudohomogeneous model was developed to study effects of system parameters on process performance for a gas-solid lamp-in-tube annular-photocatalytic-oxidation (PCO) reactor in which the annular space is filled with photocatalyst-coated packing. In this model the flow field is assumed to be uniform and radial diffusion negligible. Homogeneous reactions are neglected. Heterogeneous reaction rates follow Langmuir-Hinshelwood-Houghen-Watson kinetics with rate parameters extracted from independent experiments. A 1-D "two-flux" incidence submodel is used to account for the radial UV light distribution throughout the reactor annular space. This submodel requires knowledge of the UV lamp radiant emittance, the optical characteristics of the catalytic thin-film coating, and the UV irradiance at the outer wall of the reactor and contains only a single adjustable parameter - the mean free path between photon-catalyst interactions. The model was validated with experimental performance measurements for destruction of acetone and isopropyl alcohol in a bench-scale photoreactor. The validated model can be used to predict the optimum catalyst film thickness for given reactor dimensions, packing shape and size, and VOC abatement problem.

Original languageEnglish (US)
Pages (from-to)792-801
Number of pages10
JournalAICHE Journal
Volume43
Issue number3
StatePublished - Mar 1997

Fingerprint

Packed beds
Air
Radiation
Fluxes
Oxidation
Catalysts
2-Propanol
Ultraviolet Rays
Acetone
Volatile organic compounds
Photons
Gases
Ultraviolet lamps
Light
Costs and Cost Analysis
Photocatalysis
Incidence
Photocatalysts
Electric lamps
Ultraviolet radiation

ASJC Scopus subject areas

  • Biotechnology
  • Chemical Engineering(all)
  • Mechanical Engineering
  • Environmental Engineering
  • Polymers and Plastics

Cite this

Raupp, G., Nico, J. A., Annangi, S., Changrani, R., & Annapragada, R. (1997). Two-Flux Radiation-Field Model for an Annular Packed-Bed Photocatalytic Oxidation Reactor. AICHE Journal, 43(3), 792-801.

Two-Flux Radiation-Field Model for an Annular Packed-Bed Photocatalytic Oxidation Reactor. / Raupp, Gregory; Nico, Jill A.; Annangi, Suneetha; Changrani, Rajnish; Annapragada, Rao.

In: AICHE Journal, Vol. 43, No. 3, 03.1997, p. 792-801.

Research output: Contribution to journalArticle

Raupp, G, Nico, JA, Annangi, S, Changrani, R & Annapragada, R 1997, 'Two-Flux Radiation-Field Model for an Annular Packed-Bed Photocatalytic Oxidation Reactor', AICHE Journal, vol. 43, no. 3, pp. 792-801.
Raupp G, Nico JA, Annangi S, Changrani R, Annapragada R. Two-Flux Radiation-Field Model for an Annular Packed-Bed Photocatalytic Oxidation Reactor. AICHE Journal. 1997 Mar;43(3):792-801.
Raupp, Gregory ; Nico, Jill A. ; Annangi, Suneetha ; Changrani, Rajnish ; Annapragada, Rao. / Two-Flux Radiation-Field Model for an Annular Packed-Bed Photocatalytic Oxidation Reactor. In: AICHE Journal. 1997 ; Vol. 43, No. 3. pp. 792-801.
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