Thermally Activated Formation of Reactive Lattice Oxygen in Titania on Nanoporous Gold

doi:10.1021/acs.jpcc.7b06316

Title: Thermally Activated Formation of Reactive Lattice Oxygen in Titania on Nanoporous Gold

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Abstract

Nanoporous gold modified by atomic layer deposition of titania was employed as a model, inverse supported precious metal catalyst to explore the oxidative reactivity of Au/TiO ₂ catalysts. The catalyst material is active for oxidation of CO using O from the titania lattice, even at low temperatures. The reactive lattice oxygen available for oxidative reactions was formed by thermal activation, with the total oxidative reactivity of the material showing a strong dependence on the annealing temperature prior to CO exposure. Finally, reduction of the titania via CO oxidation can be reversed under relatively mild conditions by exposure to O ₂, presenting a viable mechanism for CO oxidation in steady state catalytic conditions.

Authors:

Ewers, Bradley W. ^[1];

^[1]; Biener, Monika M. ^[2];

^[1]

Harvard Univ., Cambridge, MA (United States). Dept. of Chemistry and Chemical Biology
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Nanoscale Synthesis and Characterization Lab.

Publication Date:: 2017-09-07

Research Org.:: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Sponsoring Org.:: USDOE National Nuclear Security Administration (NNSA)

OSTI Identifier:: 1468908

Report Number(s):: [LLNL-JRNL-737660]
[Journal ID: ISSN 1932-7447; 890666]

Grant/Contract Number:: [AC52-07NA27344]

Resource Type:: Accepted Manuscript

Journal Name:: Journal of Physical Chemistry. C

Additional Journal Information:: [ Journal Volume: 121; Journal Issue: 39]; Journal ID: ISSN 1932-7447

Publisher:: American Chemical Society

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats


                    Ewers, Bradley W., Crampton, Andrew S., Biener, Monika M., and Friend, Cynthia M. Thermally Activated Formation of Reactive Lattice Oxygen in Titania on Nanoporous Gold.  United States: N. p., 2017. 
        Web.  doi:10.1021/acs.jpcc.7b06316.

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                    Ewers, Bradley W., Crampton, Andrew S., Biener, Monika M., & Friend, Cynthia M. Thermally Activated Formation of Reactive Lattice Oxygen in Titania on Nanoporous Gold.  United States.  doi:10.1021/acs.jpcc.7b06316.

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                    Ewers, Bradley W., Crampton, Andrew S., Biener, Monika M., and Friend, Cynthia M. Thu .  
        "Thermally Activated Formation of Reactive Lattice Oxygen in Titania on Nanoporous Gold".  United States.  doi:10.1021/acs.jpcc.7b06316.  https://www.osti.gov/servlets/purl/1468908.

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@article{osti_1468908,

  title        = {Thermally Activated Formation of Reactive Lattice Oxygen in Titania on Nanoporous Gold},

  author       = {Ewers, Bradley W. and Crampton, Andrew S. and Biener, Monika M. and Friend, Cynthia M.},

  abstractNote = {Nanoporous gold modified by atomic layer deposition of titania was employed as a model, inverse supported precious metal catalyst to explore the oxidative reactivity of Au/TiO2 catalysts. The catalyst material is active for oxidation of CO using O from the titania lattice, even at low temperatures. The reactive lattice oxygen available for oxidative reactions was formed by thermal activation, with the total oxidative reactivity of the material showing a strong dependence on the annealing temperature prior to CO exposure. Finally, reduction of the titania via CO oxidation can be reversed under relatively mild conditions by exposure to O2, presenting a viable mechanism for CO oxidation in steady state catalytic conditions.},

  doi          = {10.1021/acs.jpcc.7b06316},

  journal      = {Journal of Physical Chemistry. C},

  number       = [39],

  volume       = [121],

  place        = {United States},

  year         = {2017},

  month        = {9}

}

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DOI: 10.1021/acs.jpcc.7b06316

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