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A study of the aging of photocatalysts
Technical Paper
2000-05-0323
Sector:
Language:
English
Abstract
To reduce cold-start emissions that is a bottleneck of tightened
regulation, a photocatalyst was suggested and studied. Conventional
TWC can reduce more than 96% of harmful emissions after the
activation, but under a cold-start condition it needs a lot of
energy to activate. During the activation time (light-off time)
harmful gases are exhausted without any purification and it makes
the conventional TWC difficult to satisfy tightened regulation. A
photocatalyst can be activated by light that has wavelengths lower
than 380 nano-meters. The activation needs no time and loss of
energy like a TWC.
To apply the photocatalyst on a vehicle aftertreatment a
photocatalyst system was suggested that uses non-thermal plasma as
a light source of photocatalyst. The durability of a photocatalyst
was also studied with hydrothermal aging method. The properties of
aged catalyst were tested with surface area, phase transformation
and conversion efficiency of HC.