2.3. FTIR
Catalyst powder was treated with 7.5% 0 2 and
the balance N 2 at 400°C. After the treatment, IR
spectra were obtained with the diffuse reflectance
method under conditions of 0.3% CO and the bal-
ance N 2 at 200°C. The amounts of absorbed CO
were calculated from the obtained IR spectra with
the Kubelka-Munk equation.