A photocatalytic membrane reactor for VOC decomposition using Pt-modified titanium oxide porous membranes

Tsuru Toshinori

Kan-no Takehiro

Yoshioka Tomohisa

Asaeda Masashi

Journal of Membrane Science

Porous titanium oxide membranes with pore sizes in the range of 2.5-22 nm were prepared by a sol-gel procedure, and were applied for decomposition of methanol and ethanol as model volatile organic compounds (VOCs) in a photocatalytic membrane reactor, where oxidation reaction occurs both on the surface and inside the porous TiO2 membrane while reactants are permeating via one-pass flow. Methanol was completely photo-oxidized by black-light irradiation to CO2 when methanol at a concentration of 100 ppm was used at a feed flow rate of 500 × 10-6 m3/min, but the conversion decreased when the MeOH concentration in the feed was increased. Pt-modification was carried out by photo-deposition, and led to a decrease in pore diameter. Using Pt-modified membranes, a nearly complete oxidation of methanol up to 10,000 ppm at a feed flow rate of 500 × 10-6 m3/min was observed. Thus, such membranes would be effective for purifying a permeate stream after one-pass permeation through the TiO2 membranes. The decomposition of ethanol is also discussed.

titanium oxide, photocatalysis

catalytic membrane reactor

methanol

platinum

photo-deposition

Chemistry [ 430 ]

eng

Elsevier B.V.

Copyright (c) 2006 2006 Elsevier B.V.

[ISSN] 0376-7388

[DOI] 10.1016/j.memsci.2006.01.008

[NCID] AA00702477

[DOI] http://dx.doi.org/10.1016/j.memsci.2006.01.008 isVersionOf