Co-Fe_2O_3[104]铁基载氧体优化体系作用下褐煤化学链燃烧特性

Chemical looping combustion characteristics of lignite using Co-Fe_2O_3[104]/Al_2O_3 oxygen carrier

前期研究发现高弥勒指数晶面载氧体Fe_2O_3[104]具有高的化学链燃烧反应特性,且Co对煤及其热解中间产物具有催化气化和催化转化作用。通过正交实验优化制备Co-Fe_2O_3[104]/Al_2O_3载氧体体系结构,开展Co-Fe_2O_3[104]/Al_2O_3与褐煤的化学链燃烧,揭示载氧体与褐煤发生化学链燃烧的特性。结果表明:形貌控制制备的高弥勒指数晶面铁基载氧体Co-Fe_2O_3[104]/Al_2O_3(质量分数10%)促进了褐煤化学链燃烧过程中氧的迁移速率以及载氧体的还原程度,进而显著提高了载氧体与褐煤化学链燃烧的反应速率及反应效率。进一步通过CO多循环化学链燃烧反应、XRD和TEM表征了Co-Fe_2O_3[104]/Al_2O_3(10%)的可再生性及反应稳定性。

Previous works suggested that the iron-based oxygen carrier Fe2O3 with high- index facets [104] showed high activity during chemical looping combustion（CLC）. It was also found that Co could be an efficient catalyst for catalytic gasification and conversion of coal. So, an optimized oxygen carrier system Co-Fe2O3[104]/Al2O3 was prepared through orthogonal experiments,and using it as oxygen carrier CLC of lignite was conducted to reveal its features. The results showed that Co-Fe2O3[104]/Al2O3（10%, mass fraction） prepared by morphology control can accelerate oxygen transport and its reduction, leading to an obvious increase of rate and efficiency for the reaction between the oxygen carrier and lignite. Furthermore, multi-cycle CLC of CO, XRD and TEM had been used to characterize the regeneration ability and the stability of optimized Co-Fe2O3[104]/Al2O3（10%）.