The copper dispersion of Cu/TiO2 was measured
using the method of Chang et al. [7]. The Cu/TiO2
catalyst was reduced in a 5% H2/Ar stream at 300 ◦C
for 3 h. The catalyst was purged and cooled to 80 ◦C in
Ar, and the oxidation was then performed using N2Oat
that temperature. Only surface copper was selectively
oxidized by N2O when the oxidation temperature was
under less than 100 ◦C. The decomposition of N2O
on the Cu surface generated the chemisorbed oxygen
atoms as shown in Eq. (2) [8]. Following oxidation,
the catalyst was again purged in Ar and cooled to
25 ◦C. Hydrogen temperature programmed reduction
(TPR) was performed from 25 to 400 ◦C at 10◦C/min
in a 5% H2/Ar stream. The consumption of H2 was
measured from TPR and the dispersion of copper was
calculated.