Thus only 14.0% yield on N2 is
obtained for this sample. In addition, the maximum yield on N2 is
present at high temperature of 320 ◦C, because propylene is hard
to activate. After Ti introduction into clay as support, the quantity
of the nitrate adsorbed species increases and the reducing agent
of propylene is easier to be activated. Therefore, these samples
show a higher low-temperature activity for NO conversion into
N2. The decomposition temperature of the adsorbed nitrate species
is very low for the Cu-Ti-PILC catalyst with Ti/clay = 2.5 so that a
part of the adsorbed nitrate species is not able to react with the
activated propylene and decomposes into nitrate