Thermal Reduction of Ceria within an Aerosol Reactor for H2O and CO2 Splitting
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- 作者：Jonathan R. Scheffe ; Michael Welte ; Aldo Steinfeld
- 刊名：Industrial & Engineering Chemistry Research
- 出版年：2014
- 出版时间：February 12, 2014
- 年：2014
- 卷：53
- 期：6
- 页码：2175-2182
- 全文大小：353K
- ISSN：1520-5045
文摘
An aerosol reactor was tested for the thermal reduction of ceria as part of a solar thermochemical redox cycle for producing H2 and CO from H2O and CO2. The design is based on the downward aerosol flow of ceria particles, counter to an argon sweep gas, which are rapidly heated and thermally reduced within residence times of less than 1 s. When operating in the temperature range of 1723鈥?873 K and at oxygen partial pressures between 5 脳 10鈥? and 1.2 脳 10鈥? atm, reduction extents of small particles (Dv50 = 12 渭m) approached those predicted by thermodynamics. However, heat- and mass-transfer effects were found to limit their conversion when the ceria mass flow rate was increased above 100 mg s鈥?. This reactor concept inherently results in separation of the reduced ceria and evolved O2(g), operates isothermally throughout the day, and decouples the reduction and oxidation steps in both space and time for potential 24-h syngas generation.