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Recently, social needs
for comfortable environments are increasing. Especially,
odor nuisances indoors or in vehicles are difficult
to solve, because odor components are perceivable
even when their concentrations are extremely low.
In order to overcome this problem, we focused on
the photocatalytic reaction.
TiO2-coated
photocatalysts prepared on honeycomb supports were
systematically examined in terms of purifying gaseous
contaminants in extremely low concentrations at
room temperature. The contaminants diminished on
the TiO2 photocatalyst under the coexistence
of O2 and UV irradiation. The reaction
proceeded stoichiometrically. The excellent results
have encouraged us to develop an "on-board" air
purifier based on the photocatalysis principle.
The purifier has been evaluated on a new vehicle
as well as ones in use, and its effectiveness was
clearly confirmed through both chemical analysis
and sensory test. In addition to the on-board use,
this air purifier is promising for versatile applications.
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