TY - JOUR
T1 - Microsecond kinetics of photocatalytic oxidation on Pt/TiO2 traced by vibrational spectroscopy
AU - Yamakata, Akira
AU - Ishibashi, Taka Aki
AU - Onishi, Hiroshi
N1 - Funding Information:
This work was supported by CREST of the Japan Science and Technology Corporation and Grant-in-Aid for Scientific Research from the Ministry of Education, Culture, Sports, Science and Technology of Japan (No. 60321915).
PY - 2003/7/31
Y1 - 2003/7/31
N2 - 2-Propanol oxidation to acetone was examined by time-resolved infrared spectroscopy on a Pt/TiO2 photocatalyst in an aqueous solution. Holes generated by the band-gap excitation were found to attach to the adsorbed reactant within the first 0.5 μs. Subsequent rearrangement of atoms in the hole-attached reactant was observed on a series of time-resolved vibrational spectra. The C=O stretching band of a reaction intermediate to be converted to acetone appeared at time delays of 0-20 μs. The observed wavenumber of the intermediate, 1640 cm-1, was compared with theoretically predicted C=O stretching frequencies of possible species. An acceptable agreement was obtained with the anion radical of acetone adsorbed on the catalyst.
AB - 2-Propanol oxidation to acetone was examined by time-resolved infrared spectroscopy on a Pt/TiO2 photocatalyst in an aqueous solution. Holes generated by the band-gap excitation were found to attach to the adsorbed reactant within the first 0.5 μs. Subsequent rearrangement of atoms in the hole-attached reactant was observed on a series of time-resolved vibrational spectra. The C=O stretching band of a reaction intermediate to be converted to acetone appeared at time delays of 0-20 μs. The observed wavenumber of the intermediate, 1640 cm-1, was compared with theoretically predicted C=O stretching frequencies of possible species. An acceptable agreement was obtained with the anion radical of acetone adsorbed on the catalyst.
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U2 - 10.1016/S0009-2614(03)01034-0
DO - 10.1016/S0009-2614(03)01034-0
M3 - Article
AN - SCOPUS:0141785321
SN - 0009-2614
VL - 376
SP - 576
EP - 580
JO - Chemical Physics Letters
JF - Chemical Physics Letters
IS - 5-6
ER -