有序中孔铁催化剂的费-托合成催化性能研究

以KIT-6为模板用硬模板法合成了有序中孔铁催化剂,并引入Cu助剂,考察其费-托合成反应催化性能,采用原位小角X-射线衍射和N2物理吸附等对其表征,考察了Cu助剂和CO还原对其催化性能和结构的影响.结果表明：模板法合成的铁催化剂不同于传统沉淀铁催化剂,它具有特殊的有序中孔结构和较大的比表面积,较高的费-托合成反应活性和C5＋选择性.Cu助剂使有序中孔铁催化剂的还原性提高,故活性最高.CO还原后的催化剂为孔径均一的中孔结构,比表面积较大,但有序性降低,存在部分孔坍塌.

Performance of Ordered Mesoporous Fe2O3 Catalysts for Fischer-Tropsch Synthesis

Using KIT-6 as template,well ordered mesoporous Fe2O3 catalysts were synthesized by hard templating method with Cu as the promoter and its catalytic performance on Fischer-Tropsch synthesis were studied.In situ small angle X-ray diffraction and N2 physisorption were used to investigate the effect of Cu and CO reduction on Fe2O3 catalytic performance and structural properties.Different from conventional precipitated iron catalyst,the results indicated that Fe2O3 catalysts with specially ordered mesoporous structure increased surface area and FTS reaction activity as well as C5+ selectivity.The promoter Cu increased its reducibility and exihibited the best FTS activity.Moreover,CO reduced catalysts kept mesoporous structure with uniform pore sizes and high surface area.However,its mesoporous structure order was decreased by the collapse of pore structure.