Dispersion and stability mechanism of Pt nanoparticles on transition-metal oxides

被引：6
作者：
Jeong, Eun-Suk [1 ,2 ]
Hwang, In-Hui [3 ]
Han, Sang-Wook [1 ,2 ]
机构：
[1] Jeonbuk Natl Univ, Dept Phys Educ, Jeonju 54896, South Korea
[2] Jeonbuk Natl Univ, Inst Fus Sci, Jeonju 54896, South Korea
[3] Argonne Natl Lab, Adv Photon Source, X Ray Sci Div, Lemont, IL 60439 USA
来源：
SCIENTIFIC REPORTS | 2022年 / 12卷 / 01期
基金：
新加坡国家研究基金会;
关键词：
ANATASE TIO2(101) SURFACE; SUPPORT INTERACTION SMSI; X-RAY; OXYGEN REDUCTION; PEROXO COMPLEXES; PT-NI; CATALYSTS; TIO2; HYDROGEN; PD;
D O I：
10.1038/s41598-022-17638-6
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
The heterogeneous catalysts of Pt/transition-metal oxides are typically synthesized through calcination at 500 degrees C, and Pt nanoparticles are uniformly and highly dispersed when hydrogen peroxide (H2O2) is applied before calcination. The influence of H2O2 on the dispersion and the stability of Pt nanoparticles on titania-incorporated fumed silica (Pt/Ti-FS) supports was examined using X-ray absorption fine structure (XAFS) measurements at the Pt L-3 and Ti K edges as well as density functional theory (DFT) calculations. The local structural and chemical properties around Pt and Ti atoms of Pt/Ti-FS with and without H2O2 treatment were monitored using in-situ XAFS during heating from room temperature to 500 degrees C. XAFS revealed that the Pt nanoparticles of H2O2-Pt/Ti-FS are highly stable and that the Ti atoms of H2O2-Pt/Ti-FS support form into a distorted-anatase TiO2. DFT calculations showed that Pt atoms bond more stably to oxidized-TiO2 surfaces than they do to bare- and reduced-TiO2 surfaces. XAFS measurements and DFT calculations clarified that the presence of extra oxygen atoms due to the H2O2 treatment plays a critical role in the strong bonding of Pt atoms to TiO2 surfaces.
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页数：13
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