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Title: Temperature-dependent local structural properties of redox Pt nanoparticles on TiO 2 and ZrO 2 supports

Abstract

This paper examined the local structural properties of Pt nanoparticles on SiO 2, TiO 2–SiO 2, and ZrO 2–SiO 2 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, H 2, and O 2 gas environments. The XAFS measurements demonstrated that Pt atoms were highly dispersed on TiO 2–SiO 2 and ZrO 2–SiO 2 forming pancake-shaped nanoparticles, whereas Pt atoms formed larger particles of hemispherical shapes on SiO 2 supports. Contrary to the SiO 2 case, the coordination numbers for Pt, Ti, and Zr around Pt atoms on the TiO 2–SiO 2 and ZrO 2–SiO 2 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 TiO 2 or ZrO 2 on the surface of SiO 2 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.

Authors:
 [1];  [1];  [1];  [1];  [1];  [2];  [2];  [1]
  1. Chonbuk National Univ., Jeonju (Korea)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Fuels, Engines and Emissions Research Center (FEERC); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). National Transportation Research Center (NTRC)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
1185608
Grant/Contract Number:
AC05-00OR22725
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Catalysis Letters
Additional Journal Information:
Journal Volume: 145; Journal Issue: 3; Journal ID: ISSN 1011-372X
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; metal support interaction; oxidation catalysts; EXAFS, XANES; Pt catalysts; SiO2, TiO2

Citation Formats

Jeong, Eun -Suk, Park, Chang -In, Jin, Zhenlan, Hwang, In -Hui, Son, Jae -Kwan, Kim, Mi -Young, Choi, Jae -Soon, and Han, Sang -Wook. Temperature-dependent local structural properties of redox Pt nanoparticles on TiO2 and ZrO2 supports. United States: N. p., 2015. Web. doi:10.1007/s10562-015-1483-x.
Jeong, Eun -Suk, Park, Chang -In, Jin, Zhenlan, Hwang, In -Hui, Son, Jae -Kwan, Kim, Mi -Young, Choi, Jae -Soon, & Han, Sang -Wook. Temperature-dependent local structural properties of redox Pt nanoparticles on TiO2 and ZrO2 supports. United States. doi:10.1007/s10562-015-1483-x.
Jeong, Eun -Suk, Park, Chang -In, Jin, Zhenlan, Hwang, In -Hui, Son, Jae -Kwan, Kim, Mi -Young, Choi, Jae -Soon, and Han, Sang -Wook. Wed . "Temperature-dependent local structural properties of redox Pt nanoparticles on TiO2 and ZrO2 supports". United States. doi:10.1007/s10562-015-1483-x. https://www.osti.gov/servlets/purl/1185608.
@article{osti_1185608,
title = {Temperature-dependent local structural properties of redox Pt nanoparticles on TiO2 and ZrO2 supports},
author = {Jeong, Eun -Suk and Park, Chang -In and Jin, Zhenlan and Hwang, In -Hui and Son, Jae -Kwan and Kim, Mi -Young and Choi, Jae -Soon and Han, Sang -Wook},
abstractNote = {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.},
doi = {10.1007/s10562-015-1483-x},
journal = {Catalysis Letters},
number = 3,
volume = 145,
place = {United States},
year = {Wed Jan 21 00:00:00 EST 2015},
month = {Wed Jan 21 00:00:00 EST 2015}
}

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