The effects of morphology on the thermal reduction of nonstoichiometric ceria

被引:29
作者
Keene, Daniel J. [1 ]
Lipinski, Wojciech [1 ]
Davidson, Jane H. [1 ]
机构
[1] Australian Natl Univ, Res Sch Engn, Canberra, ACT 0200, Australia
基金
美国国家科学基金会;
关键词
Concentrating solar; Thermochemistry; Ceria; Redox cycle; Porous; Synthetic fuel; RETICULATE POROUS CERAMICS; OPTICAL-PROPERTIES; HEAT; CO2; MEDIA; H2O; CONDUCTIVITY; DIOXIDE; SYNGAS; OXIDES;
D O I
10.1016/j.ces.2014.01.010
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
A numerical heat and mass transfer model is used to study the effects of the morphological features of a porous medium composed of ceria when it is placed in a cavity and exposed to high-flux solar irradiation to drive a nonstoichiometric reduction. The morphological features are described by the porosity and pore-level Sauter mean diameter. For porosities of 0.60, 0.75, and 0.90, the rate of oxygen production and the efficiency of solar-to-chemical energy conversion increase monotonically as the Sauter mean diameter is decreased from 1000 to 30 mu m. For a porosity of 0.90, these performance metrics continue to increase clown to 10 mu m. The primary effect of the changes in porosity and Sauter mean diameter are through their influence on the permeability and the extinction coefficient of the medium. For appropriately selected time duration, an energy conversion efficiency of 10.9% is achieved with a Sauter mean diameter of 10 mu m and a porosity of 0.90. (C) 2014 Elsevier Ltd. All rights reserved.
引用
收藏
页码:231 / 243
页数:13
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