期刊
APPLIED SURFACE SCIENCE
卷 426, 期 -, 页码 333-341出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2017.07.096
关键词
Phase structure; Catalytic formaldehyde oxidation; Density functional theory; Oxygen vacancy; Titanium dioxide
类别
资金
- NSFHP [2015CFA001]
- 973 program [2013CB632402]
- Fundamental Research Funds for the Central Universities [WHUT: 2017-YB-002, 2017IVA094]
- NSFC [51602098, 51320105001, 51372190, 21573170, 21433007]
- Innovative Research Funds of SKLWUT [2017-ZD-4]
- [2015-III-034]
Catalytic oxidation at room temperature over well-designed catalysts is an environmentally friendly method for the abatement of indoor formaldehyde (HCHO) pollution. Herein, nanocomposites of platinum(Pt) and titanium dioxide (TiO2) nanofibers with various phase compositions were prepared by calcining the electrospun TiO2 precursors at different temperatures and subsequently depositing Pt nanoparticles (NPs) on the TiO2 through a NaBH4-reduction process. The phase compositions and structures of Pt/TiO2 can be easily controlled by varying the calcination temperature. The Pt/TiO2 nanocomposites showed a phase-dependent activity towards the catalytic HCHO oxidation. Pt/TiO2 containing pure rutile phase showed enhanced activity with a turnover frequency (TOF) of 16.6min(-1) (for a calcination temperature of 800 degrees C) as compared to those containing the anatase phase or mixed phases. Density functional theory calculation shows that TiO2 nanofibers with pure rutile phase have stronger adsorption ability to Pt atoms than anatase phase, which favors the reduction of Pt over rutile phase TiO2, leading to higher contents of metallic Pt in the nanocomposite. In addition, the Pt/TiO2 with rutile phase possesses more abundant oxygen vacancies, which is conducive to the activation of adsorbed oxygen. Consequently,the Pt/rutile-TiO2 nanocomposite exhibited better catalytic activity towards HCHO oxidation at room temperature. (C) 2017 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据