Citation: LI Na, CHEN Qiu-Yan, LUO Meng-Fei, LU Ji-Qing. Kinetics Study of CO Oxidation Reaction over Pt/TiO₂ Catalysts[J]. Acta Physico-Chimica Sinica, ;2013, 29(05): 1055-1062. doi: 10.3866/PKU.WHXB201301181 shu

Kinetics Study of CO Oxidation Reaction over Pt/TiO₂ Catalysts

1.
Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua 321004, Zhejiang Province, P. R. China

Received Date: 31 October 2012
Available Online: 18 January 2013
Fund Project: 国家自然科学基金(21173195)资助项目 (21173195)

A series of Pt/TiO₂ catalysts were prepared using a deposition-precipitation method and calcined at different temperatures to obtain various Pt particle sizes. The catalysts were tested for catalytic CO oxidation and the kinetics of the reaction was studied. The results showed that the Pt particle size increased with calcination temperature, and that their reactivity for CO oxidation first increased and then decreased with increasing calcination temperature, with the catalyst calcined at 400℃ possessing the highest reactivity. The kinetic investigation revealed that the reaction rate could be described by r=5.4×10^-7p _CO^0.17p_O₂^0.36, suggesting that the reaction followed a Langmuir-Hinshelwood mechanism. Meanwhile, O₂ chemisorption and infrared (IR) spectroscopy of CO chemisorption on the catalysts were conducted to reveal the relationship between the catalyst structure and its catalytic behavior. It was found that the amount of O₂ chemisorption and the intensity of CO chemisorption by IR on the catalysts first increased and then decreased with increasing calcination temperature, which was consistent with the catalytic results and the kinetic equation. This could explain the catalytic behaviors of the catalysts. For example, the highest amounts of chemisorbed O₂ and CO were obtained over the Pt/TiO₂ calcined at 400℃, which resulted in the highest reactivity. Such an enhancement in reactivity was probably due to the strong interaction between Pt and TiO₂ induced by the calcination process.
- CO oxidation,
- Pt/TiO₂,
- Metal-support interaction,
- Reaction kinetics,
- Chemisorption
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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

Kinetics Study of CO Oxidation Reaction over Pt/TiO2 Catalysts

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通讯作者: 陈斌, bchen63@163.com

Kinetics Study of CO Oxidation Reaction over Pt/TiO₂ Catalysts