Oxidation and Reduction of Iron-Titanium Oxides in Chemical Looping Combustion: A Phase-Chemical Description

被引：29
作者：
den Hoed, P. [1 ]
Luckos, A. [2 ]
机构：
[1] Anglo Res, ZA-2091 Johannesburg, South Africa
[2] Sasol Technol, Sasolburg, South Africa
来源：
OIL & GAS SCIENCE AND TECHNOLOGY-REVUE D IFP ENERGIES NOUVELLES | 2011年 / 66卷 / 02期
关键词：
SOLID-SOLUTION; SYSTEM FE-FE2O3-TIO2; OXYGEN CARRIERS; EQUILIBRIA; ILMENITE; OPERATION; FUELS;
D O I：
10.2516/ogst/2011008
中图分类号：
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号：
0807 ; 0820 ;
摘要：
Oxidation and Reduction of Iron-Titanium Oxides in Chemical Looping Combustion: A Phase-Chemical Description - Ilmenite (FeTiO3) is being explored as an oxygen carrier in chemical looping processes. Its reduction and oxidation are described by the system Fe-Fe2O3-TiO2-Ti2O3. The phase diagram at 1000 degrees C, presented here, offers a useful tool for predicting reactions and their products. We see that Fe2TiO5 (pseudobrookite) and TiO2 (rutile) form a stable phase assemblage following the oxidation of FeTiO3 (ilmenite) in air. The subsequent reduction of Fe2TiO5 at oxygen partial pressures of 10(-15.5) atm stabilizes Fe1.02Ti0.98O3, a solid solution of ilmenite. Further reduction will produce metallic iron, which compromises the integrity of the oxygen carrier fur chemical looping processes. We speculate that the reduction of Fe-Ti oxides in several practical instances does not reach completion (and equilibrium) under the imposed atmospheres operating in fuel reactors.
引用
收藏
页码：249 / 263
页数：15
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