Macroporous Supported Cu鈥揤 Oxide as a Promising Substitute of the Pt Catalyst for Sulfuric Acid Decomposition in Solar Thermochemical Hydrogen Production
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- 作者：Masato Machida ; Takahiro Kawada ; Shota Hebishima ; Satoshi Hinokuma ; Shinichi Takeshima
- 刊名：Chemistry of Materials
- 出版年：2012
- 出版时间：February 14, 2012
- 年：2012
- 卷：24
- 期：3
- 页码：557-561
- 全文大小：347K
- 年卷期：v.24,no.3(February 14, 2012)
- ISSN：1520-5002
文摘
The macroporous supported Cu鈥揤 oxide prepared by a novel dissolution鈥搑eprecipitation process was found to be the first example of a promising substitute of Pt catalysts for sulfuric acid decomposition at moderate temperatures (600 掳C), which is required in solar thermochemical hydrogen production. Stepwise impregnation of Cu(NO3)2 and NH4VO3 onto 3-D ordered mesoporous SiO2, and subsequent heating at 650 掳C yielded the deposition of copper pyrovanadate (Cu2V2O7, melting point: 780 掳C) not only in mesopores but also on the external surface. Thermal aging at 800 掳C caused the congruent melting of Cu2V2O7 followed by smooth penetration of the melt into mesopores and homogeneous covering of cavity walls. Because of the solubility of SiO2 into the molten vanadate, dissolution鈥搑eprecipitation should be equilibrated to allow substantial structural conversion from mesoporous to macroporous SiO2 frameworks. The resulting macroporous catalyst consisting of highly dispersed thin layers of active Cu2V2O7 is considered efficient for catalytic reactions and the mass transfer of reactants and products in the presence of high-concentration vapors.