that the
decomposition amount of the adsorbed nitrate species increased remarkably after the introduction of
titania into clay as support Moreover, the largest decomposition amount was obtained for the sample
with Ti/clay = 10. It is concluded that the titania pillar provides the Cu-Ti-PILC samples with the increased
interlay spacing, surface area and Cu2+ amount formed in the adjacent layers. These features make NO
adsorbed more easily by copper species to form the intermediate of nitrate species, which enhances the
conversion of NO into N2.