Preparation of 3D micro/nanostructured CeO2: Influence of organic/inorganic acids--颗粒学报PARTICUOLOGY

Yang, R., Yu, L., Sun, M., Zhao, X., Cheng, G., & Ye, W. (2018). Preparation of 3D micro/nanostructured CeO2: Influence of organic/inorganic acids. Particuology, 37, 17-25. https://doi.org/10.1016/j.partic.2017.07.001

Preparation of 3D micro/nanostructured CeO₂: Influence of organic/inorganic acids

Runnong Yang ^a, Lin Yu ^{a *}, Ming Sun ^a, Xiangyun Zhao ^b, Gao Cheng ^a, Wenjin Ye ^a

a Key Laboratory of Clean Chemistry Technology of Guangdong Regular Higher Education Institutions, School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, China
b Waygreen Technologies, Inc., Guangzhou 511441, China

10.1016/j.partic.2017.07.001

Volume 37, April 2018, Pages 17-25

Received 11 January 2017, Revised 13 June 2017, Accepted 11 July 2017, Available online 24 October 2017, Version of Record 3 February 2018.

E-mail: gych@gdut.edu.cn

Highlights

• Microstructured CeO₂ were prepared via a solvothermal method assisted with various organic acids.

• CeO₂ synthesized with acetic acid showed a better performance for toluene catalytic combustion.

• The activity can be attributed to its hierarchical porosity and surface-active oxygen content.

Abstract

CeO₂ is an important porous material with a wide range of applications in the abatement of volatile organic compounds (VOCs). In this paper, we prepared a series of novel three-dimensional (3D) micro/nanostructured CeO₂ materials via a solvothermal method. Organic acid-assisted synthesis and inorganic acid post-treatment were used to adjust the CeO₂ microstructures. The size of the 3D micro/nanostructures could be controlled in the range from 180 nm to 1.5 μm and the surface morphology changed from rough to smooth with the use of different organic acids. The CeO₂ synthesized with acetic acid featured a hierarchical porosity and showed good performance for toluene catalytic combustion: a T₅₀ of 187 °C and a T₉₀ of 195 °C. Moreover, the crystallite size, textural properties, and surface chemical states could be tuned by inorganic acid modification. After treatment with HNO₃, the modified CeO₂ materials exhibited improved catalytic activity, with a T₅₀ of ∼175 °C and a T₉₀ of ∼187 °C. We concluded that the toluene combustion activity is related to the porosity and the amount of surface active oxygen of the CeO₂. Both these features can be tuned by the co-work of organic and inorganic acids.

Graphical abstract

Keywords

3D micro/nanostructure; CeO₂; Organic acidInorganic acid; Toluene catalytic combustion

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