Temperature-dependent local structural properties of redox Pt nanoparticles on TiO2 and ZrO2 supports

Jeong, Eun -Suk; Park, Chang -In; Jin, Zhenlan; Hwang, In -Hui; Son, Jae -Kwan; Kim, Mi -Young; Choi, Jae -Soon; Han, Sang -Wook

doi:10.1007/s10562-015-1483-x

Temperature-dependent local structural properties of redox Pt nanoparticles on TiO₂ and ZrO₂ supports

Journal Article · Wed Jan 21 00:00:00 EST 2015 · Catalysis Letters

DOI:https://doi.org/10.1007/s10562-015-1483-x· OSTI ID:1185608

Jeong, Eun -Suk ^[1]; Park, Chang -In ^[1]; Jin, Zhenlan ^[1]; Hwang, In -Hui ^[1]; Son, Jae -Kwan ^[1]; Kim, Mi -Young ^[2]; Choi, Jae -Soon ^[2]; Han, Sang -Wook ^[1]

Chonbuk National Univ., Jeonju (Korea)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

This paper examined the local structural properties of Pt nanoparticles on SiO₂, TiO₂–SiO₂, and ZrO₂–SiO₂ supports to better understand the impact of oxide-support type on the performance of Pt-based catalysts. In situ X-ray absorption fine structure (XAFS) measurements were taken for the Pt L3-edge in a temperature range from 300 to 700 K in He, H₂, and O₂ gas environments. The XAFS measurements demonstrated that Pt atoms were highly dispersed on TiO₂–SiO₂ and ZrO₂–SiO₂ forming pancake-shaped nanoparticles, whereas Pt atoms formed larger particles of hemispherical shapes on SiO₂ supports. Contrary to the SiO₂ case, the coordination numbers for Pt, Ti, and Zr around Pt atoms on the TiO₂–SiO₂ and ZrO₂–SiO₂ supports were nearly constant from 300 to 700 K under the different gas environments. These results are consistent with the improvements in thermal stability of Pt nanoparticles achieved by incorporating TiO₂ or ZrO₂ on the surface of SiO₂ supports. XAFS analysis further indicated that the enhanced dispersion and stability of Pt were a consequence of the strong metal support interaction via Pt–Ti and Pt–Zr bonds.

View Accepted Manuscript (DOE)

Research Organization:: Fuels, Engines and Emissions Research Center; National Transportation Research Center (NTRC); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1185608

Journal Information:: Catalysis Letters, Journal Name: Catalysis Letters Journal Issue: 3 Vol. 145; ISSN 1011-372X

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
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metal support interaction
oxidation catalysts

Temperature-dependent local structural properties of redox Pt nanoparticles on TiO2 and ZrO2 supports

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Temperature-dependent local structural properties of redox Pt nanoparticles on TiO₂ and ZrO₂ supports