Palladium Catalysis of O2 Reduction by Electrons Accumulated on TiO2 Particles during Photoassisted Oxidation of Organic Compounds

Chong Mou Wang, Adam Heller, Heinz Gerischer*

*此作品的通信作者

研究成果: 雜誌貢獻期刊論文同行評審

323 引文 斯高帕斯(Scopus)

摘要

Our earlier theoretical analysis suggested that the quantum efficiency of photoassisted oxidation of organic compounds in water by O2 on n-TiO2 surfaces can be limited by the kinetics of the reduction of O2. When the rate of O2 reduction is not sufficiently fast to match the rate of reaction of holes, an excess of electrons will accumulate on the TiO2 particles, and the rate of electron-hole recombination will increase. We now show experimentally that electrons do indeed accumulate on slurried TiO2 particles during photoassisted oxidation of 1.6 M aqueous methanol and that electrons on the slurried particles persist for at least ∼ 1 min even in O2-saturated solutions. The rate of particle depolarization, i.e. of electron transfer to dissolved O2, is increased and the negative charge on the TiO2 particles is completely eliminated upon incorporation of Pd0 in the surface of the TiO2 particles. We also show that incorporation of Pd0 in the surface increases the quantum efficiency of the photoassisted oxidation of 10−2 M aqueous 2,2-dichloropropionate 3-fold at 0.01 wt % Pd and 7-fold at 2 wt % Pd.

原文英語
頁(從 - 到)5230-5234
頁數5
期刊Journal of the American Chemical Society
114
發行號13
DOIs
出版狀態已發佈 - 1992 六月 1
對外發佈

ASJC Scopus subject areas

  • 催化
  • 化學 (全部)
  • 生物化學
  • 膠體和表面化學

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