Hydrothermal synthesis of CuV2O6 supported on mesoporous SiO2 as SO3 decomposition catalysts for solar thermochemical hydrogen production |
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| Affiliation: | 1. Boreskov Institute of Catalysis, Prosp. Akademika Lavrentieva 5, Novosibirsk 630090, Russia;2. Novosibirsk State University, Pirogova St. 2, Novosibirsk 630090, Russia;3. FSUE Krylov State Research Centre, Moskovskoye Shosse 44, St. Petersburg 196158, Russia;1. Univ. Bordeaux, IMS, UMR 5218, Talence 33400, France;2. Andra, Châtenay-Malabry 92298, France;1. Institute of Microelectronics, Department of Electrical Engineering, National Cheng-Kung University, 1 University Road, Tainan 70101, Taiwan, ROC;2. Department of Chemical Engineering, National Cheng-Kung University, No. 1, University Road, Tainan 70101, Taiwan, ROC;1. Department of Chemistry, Centre of Advanced Study, Faculty of Science, Banaras Hindu University, Varanasi 221005, India;2. Department of Chemical Engineering, Indian Institute of Technology, Banaras Hindu University, Varanasi 221005, India |
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| Abstract: | Hydrothermal synthesis of CuV2O6 supported on 3-D ordered mesoporous SiO2 (CuV/SiO2) was studied to evaluate the catalytic activity for SO3 decomposition, which is a key step in solar thermochemical hydrogen production. A composite oxide hydrate, Cu3O(V2O7)·H2O, and an oxide hydroxide hydrate, Cu3(OH)2V2O7·(H2O)2, were formed at lower hydrothermal temperatures (≤200 °C). The oxide hydrate phase mainly yielded Cu2V2O7 after calcination at 600 °C in air. By contrast, the hydrothermal synthesis at 250 °C (CuV/SiO2@250) directly crystallized CuV2O6 from the oxide hydroxide hydrate, although its very large particle size (∼5 μm) is not suitable for the catalytic application. The SO3 decomposition activity measured at 600 °C was associated with the yield as well as the dispersion of CuV2O6, giving rise to the maximum for the hydrothermal synthesis at 200 °C. CuV/SiO2@250 achieved the highest catalytic activity at the reaction temperature of 650 °C, because the melting phase of CuV2O6 penetrated mesoporous SiO2 and thus improved the dispersion of the active phase. |
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| Keywords: | Copper vanadate Hydrothermal synthesis Solar hydrogen |
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