Preparation of 3D micro/nanostructured CeO2: Influence of organic/inorganic acids |
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| Institution: | 1. 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;2. Waygreen Technologies, Inc., Guangzhou 511441, China;1. Institute for Chemicals and Fuels from Alternative Resources, Western University, 22312 Wonderland Rd., Ilderton, ON, N0 M2AO, Canada;2. Edmonton Research Centre, Syncrude Canada Ltd, 9421 17th Ave, Edmonton, AB, T6N 1H4, Canada;3. The Petroleum Institute, PO Box 2533, Abu Dhabi, UAE;1. Institute of Atmospheric Sciences and Climate (ISAC)-CNR, Bologna, Italy;2. Department of Physics and Earth Sciences, University of Ferrara, 44122, Ferrara, Italy;3. ECSIN — European Center for the Sustainable Impact of Nanotechnology, Veneto Nanotech Scpa, Rovigo, Italy;4. Regional Agency for Prevention, Environment and Energy of Emilia-Romagna (ARPAE), Bologna, Italy;5. University of Eastern Piedmont “A. Avogadro”, Department of Science and Technology Innovation, Alessandria, Italy;1. School of Environmental and Natural Resource Sciences, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia;2. Institute for Environment and Development (Lestari), Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia;3. Department of Biology, Faculty of Science and Mathematics, Universiti Pendidikan Sultan Idris, 35900 Tanjung Malim, Perak, Malaysia;4. Centre for Tropical Climate Change System (IKLIM), Institute of Climate Change, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia;5. Department of Environmental Science, Faculty of Science and Technology, Pibulsongkram Rajabhat University, Phitsanulok, Thailand |
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| 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. |
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| Keywords: | 3D micro/nanostructure Organic acid Inorganic acid Toluene catalytic combustion |
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