The spillover of atomic hydrogen from supported Au particles on TiO2 has been studied. IR spectroscopy
detects trapped electrons in the TiO2 lattice produced by the atomic H delivered from the Au. The spillover
process is one-half order in P
H
2
and the activation energy for H2 dissociation on Au is 0.52 ± 0.02 eV. It is
shown that surface Ti−OH groups are not involved in donating electrons to the trap sites in TiO2.
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