Performance Evaluation of a Titania-coated Reticulated Foam Photocatalytic Oxidation Reactor
-
Rajnish Changrani
Abstract
We have constructed and evaluated the performance of a gas-solid annular photocatalytic oxidation reactor that incorporates an alumina reticulated foam monolith element as a titania catalyst support. The reticulate occupies the annular region formed by the lamp and the outer reactor tube. Three alumina reticulates possessing different mean pore sizes and pore densities, designated as 10, 20 and 30 pores-per-inch (PPI) were employed. The reticulates were wash-coated with Degussa P25 titania. Light transmittance measurements through the reticulates showed that 30 PPI reticulate, the least optically dense element, captures the most light. Photocatalytic oxidation of dilute isopropanol (IPA) in air was chosen as the probe reaction to assess the performance of each reticulate- catalyst coating configuration. Process parameters varied were inlet IPA concentration, incident UV intensity, and mean gas residence time. For similar catalyst loadings, the 30 PPI reticulate outperformed both the 20 and 10 PPI reticulates, while the 20 PPI reticulate modestly outperformed the 10 PPI reticulate. With increasing titania coating yielding thicker titania films, general performance increases until a critical thickness is achieved. Light intensity measurements and simple forward UV intensity profile calculations reveal that reticulate performance is largely governed by the UV intensity profile. For a given reticulate, results suggest that the optimum thickness of the TiO2 catalyst film is realized when the film is sufficiently thick to absorbs all the impinging UV radiation. The data further suggest that for the probe reaction employed, the reticulates afford efficient gas-solid contact with a minimum of mass transfer influence on performance.
© 2017 by Walter de Gruyter Berlin/Boston
Articles in the same Issue
- Masthead
- Contents
- Preface
- Editorial
- Research Articles
- UV Radiation Distribution in A Flat-Plate Photocatalytic Reactor with Suspended Particles of Titanium Dioxide. Mathematical Model and Experimental Verification
- Quantum Efficiencies of the Photocatalytic Decomposition of Trichloroethylene in Water. A Comparative Study for Different Varieties of Titanium Dioxide Catalysts
- Reaction Kinetics of the Suspended Solid, Titanium Dioxide Photocatalyzed Decompostion of Trichloroethylene in Water
- Fiber-Mediated Titanium Dioxide Photocatalysis
- Computational and Experimental Studies of UV/Titania Photocatalytic Oxidation of VOCs in Honeycomb Monoliths
- Photodegradation of Organic Compounds in the Vapor Phase Using TiO2-Coated Optical Fibers
- Photocatalysis with Fe/TiO2 Semiconductors and TiO2 Sensitized by Phthalocyanines
- TiO2-Mediated Photoelectrocatalytic Purification of Water
- Performance Evaluation of a Titania-coated Reticulated Foam Photocatalytic Oxidation Reactor
- Modeling of a Photocatalytic Honeycombed Monolith Reactor for Air Purification Processes
- Photoreduction of Copper on TiO2 Nanoparticles Modified with Polydentate Ligands
- Decomposition of 2-Chlorobiphenyl in Aqueous Solutions by UV Irradiation with the Presence of Titanium Dioxide
- Effect of Fluorescent Illumination on Bacteria Supported on Glass Slides
- TiO2 Photocatalytic Oxidation of Toluene and PCE Vapor in the Air
- Adsorption and Photochemical Behavior of Polycyclic Aromatic Hydrocarbons on a non-semi conductive surface such as silica
Articles in the same Issue
- Masthead
- Contents
- Preface
- Editorial
- Research Articles
- UV Radiation Distribution in A Flat-Plate Photocatalytic Reactor with Suspended Particles of Titanium Dioxide. Mathematical Model and Experimental Verification
- Quantum Efficiencies of the Photocatalytic Decomposition of Trichloroethylene in Water. A Comparative Study for Different Varieties of Titanium Dioxide Catalysts
- Reaction Kinetics of the Suspended Solid, Titanium Dioxide Photocatalyzed Decompostion of Trichloroethylene in Water
- Fiber-Mediated Titanium Dioxide Photocatalysis
- Computational and Experimental Studies of UV/Titania Photocatalytic Oxidation of VOCs in Honeycomb Monoliths
- Photodegradation of Organic Compounds in the Vapor Phase Using TiO2-Coated Optical Fibers
- Photocatalysis with Fe/TiO2 Semiconductors and TiO2 Sensitized by Phthalocyanines
- TiO2-Mediated Photoelectrocatalytic Purification of Water
- Performance Evaluation of a Titania-coated Reticulated Foam Photocatalytic Oxidation Reactor
- Modeling of a Photocatalytic Honeycombed Monolith Reactor for Air Purification Processes
- Photoreduction of Copper on TiO2 Nanoparticles Modified with Polydentate Ligands
- Decomposition of 2-Chlorobiphenyl in Aqueous Solutions by UV Irradiation with the Presence of Titanium Dioxide
- Effect of Fluorescent Illumination on Bacteria Supported on Glass Slides
- TiO2 Photocatalytic Oxidation of Toluene and PCE Vapor in the Air
- Adsorption and Photochemical Behavior of Polycyclic Aromatic Hydrocarbons on a non-semi conductive surface such as silica
