Synthesis of cerium oxide-based nanostructures in near- and supercritical fluids |
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| Affiliation: | 1. CNRS, ICMCB, UPR9048, F-33600 Pessac, France;2. Université de Bordeaux, ICMCB, UPR9048, F-33600 Pessac, France;1. Department of Physics, PSGR Krishnammal College for Women, Coimbatore, India;2. Department of Physics, Dhirajlal Gandhi College of Technolgy, Salem, India;3. Department of Physics, MNM Jain Engineering College, Chennai, India;1. Área de Química Aplicada, Departamento de Ciencias Básicas, UAM-A, San pablo 180, C.P. 02200, Cd de México, Mexico;2. Instituto de Catálisis y Petroleoquímica, CSIC, C/Marie Curie 2, Campus Cantoblanco, 28049, Madrid, Spain;3. Facultad de Química, Universidad Autónoma del Estado de México, Paseo Colón Esquina Paseo Tollocan S/N, Toluca Estado de México, C.P. 50000, Mexico;4. Personal académico adscrito al Centro Conjunto de Investigación en Química Sustentable, UAEM-UNAM, Mexico;1. New Industry Creation Hatchery Center, Tohoku University, Aramaki aza Aoba 6-6-10, Aoba-ku, Sendai, Miyagi, Japan;2. School of Engineering, Tohoku University, Aramaki aza Aoba 6-6, Aoba-ku, Sendai, Miyagi, Japan;3. Advanced Institute for Materials Research, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai, Miyagi, Japan;4. Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi, Japan;5. Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai, Miyagi, Japan;1. Institute of Particle Science and Engineering, School of Chemical and Process Engineering, University of Leeds, Leeds LS2 9JT, United Kingdom;2. School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou City 510640, PR China;1. Department of Chemical Engineering, Tarbiat Modares University, P.O. Box 14115-143, Tehran, Iran;2. School of Chemical Engineering, College of Engineering, University of Tehran, P.O. Box 11365-4563, Tehran, Iran;3. Nuclear Science and Technology Research Institute, End of North Karegar Ave., Tehran 1439951113, Iran |
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| Abstract: | Cerium-oxide based nanostructures attract increasing interest for their use in multiple applications. In particular, the substitution of Ce atoms by other elements with lower oxidation state is used to control oxygen vacancies within the oxide structures, which can greatly enhance the material properties for catalysis applications. Among the synthesis approaches, supercritical water (scH2O) has been proved to be an extremely efficient media for the fast and facile elaboration of pure CeO2 nanostructures, although substitution was little investigated with this method (precursors’ reactivity, mechanisms, etc.). Here, the influence of two cerium precursors – Ce(NO3)3·6H2O and Ce(NO3)6(NH4)2 – in scH2O synthesis was first investigated over the CeO2 nanostructures synthesis process. Cerium ammonium nitrate was later used as precursor for the synthesis of Ce1−x−yAxByO2−δ (A, B = Zr, Pr and/or La; 0 ≤ x, y ≤ 0.1). Supported by ICP analysis quantification, this study proposes an overview of the influences of residence time, temperature and precursors’ concentration over the proportion of the substitution element in the CeO2 NCs. This work demonstrates a fast and simple process to Ce1−x−yAxByO2−δ nanostructures synthesis using scH2O synthesis. |
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| Keywords: | Cerium oxide Nanoparticles Supercritical fluids Continuous process Substitution |
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