ZrO2/TiO2载体协同作用下Fe2O3(104)与CO化学链燃烧特性

Chemical Looping Combustion Characteristics of Fe_2O_3(104) and CO Under Synergistic Action of ZrO_2/TiO_2 Carrier

在表面形貌控制增强铁基载氧体Fe_2O_3(104)化学链燃烧反应活性研究的基础上,进一步研究了TiO_2,ZrO_2载体协同作用下Fe_2O_3(104)与CO化学链燃烧的反应特性.采用X射线衍射(XRD),扫描电子显微镜(SEM)和比表面积(BET)等方法对所制备的载氧体Fe_2O_3(104)/TiO_2和Fe_2O_3(104)/ZrO_2进行表征.研究了700,800和900℃下载氧体与CO化学链燃烧反应特性.结果表明,不同载体对Fe_2O_3(104)与CO发生化学链燃烧反应活性的影响程度不同,ZrO_2作为载体明显促进Fe_2O_3(104)与CO的反应速率.动力学分析结果显示,Fe_2O_3(104)/TiO_2与CO反应模型属于一级反应,反应活化能为153.6 k J/mol;Fe_2O_3(104)/ZrO_2与CO反应模型属于抽缩球体模型,反应活化能为118.9 k J/mol.

This work focused on the synergetic effect of the supports TiO_2 and ZrO_2 on the chemical looping combustion（CLC） between Fe_2O_3（104） and CO.Fe_2O_3（104）/TiO_2 and Fe_2O_3（104）/ZrO_2 were prepared,and characterized by means of XRD,SEM and BET.Then,the CLC reactions between the prepared oxygen carrier and CO were studied under 700,800 and 900 ℃ in a small CLC reaction system,the results suggest that the supports affect the reactivity of Fe_2O_3（104）,and ZrO_2 is more efficient than TiO_2.Furthermore,dynamic analysis shows that the reaction between Fe_2O_3（104）/TiO_2 and CO could be assigned to the first order reaction model with the apparent activation energy（E） being 153.6 k J/mol,while the reaction between Fe_2O_3（104）/ZrO_2 and CO belongs to the Shrink sphere reaction model with E being 118.9 k J/mol.This work provides more reasonable dynamic model for the designing of CLC reactor.