Kinetics of hydrogen production upon reduction of aqueous TiO2 nanoparticles catalyzed by Pd(0), Pt(0), or Au(0) coatings and an unusual hydrogen abstraction; steady state and pulse radiolysis study

The Journal of Physical Chemistry. B
David Behar, Joseph Rabani

Abstract

Reduction of H(+) by TiO(2) electrons (e(TiO)(2)(-)) in aqueous colloidal solution takes place in the presence of surface metal catalysts. The catalytic reduction gives rise to adsorbed hydrogen atoms. In the presence of Pd(0) or Pt(0), material balance shows that most of the adsorbed H atoms combine to molecular hydrogen. When the TiO(2) nanoparticles are partially coated with Au(0) instead of Pd(0) or Pt(0), a higher than expected molecular hydrogen level is observed, attributed to a short chain reaction involving hydrogen abstraction from 2-propanol. This unusual hydrogen abstraction reaction has not been reported before. The mechanism and energy balance are discussed. The surface modification of TiO(2) nanoparticles was carried out by reduction of K(2)PdCl(4), H(2)PtCl(6), or HAuCl(4) with e(TiO)(2)(-). The latter had been generated through electron injection from hydrated electrons, hydrogen atoms, or 2-propanol radicals, produced by gamma or pulse radiolysis prior to the addition of the metal compounds. Upon addition of the metal compounds, immediate reactions take place producing metals clusters (M(0)) by multistep reductions reactions on the TiO(2) surface. The chemical kinetics involving the different metals and the re...Continue Reading

References

Apr 15, 2004·Journal of the American Chemical Society·Vaidyanathan SubramanianPrashant V Kamat

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Citations

Jan 10, 2012·Environmental Science & Technology·Ivana K LevyMarta I Litter
May 2, 2008·Journal of Colloid and Interface Science·Wenjiao WangMasakazu Anpo
Jul 27, 2015·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·R RevathiT Sivasudha
Jun 22, 2013·Angewandte Chemie·Matthew BresinJ Todd Hastings
Sep 27, 2013·Virulence·Fatma VatanseverMichael R Hamblin
May 8, 2009·Physical Chemistry Chemical Physics : PCCP·Weilin XuPeng Chen
Dec 9, 2017·Journal of Colloid and Interface Science·Orawan KhantamatT Randall Lee
Aug 17, 2017·The Journal of Physical Chemistry. a·Victoria Kathryn MeaderKatharine Moore Tibbetts
Jul 30, 2019·The Journal of Physical Chemistry. B·Laysa M Frias BatistaKatharine Moore Tibbetts
Sep 9, 2021·Chemistry : a European Journal·Krishnamoorthy SathiyanTomer Zidki
Sep 28, 2017·Ultrasonics Sonochemistry·M StucchiD C Boffito

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