Fe_3O_4纳米催化剂的制备及其F-T合成性能研究  

Preparation of nano-structured Fe_3O_4 catalysts and their performance in Fische r-Tropsch synthesis

作　　者：涂军令[1,2] 徐勇军[2] 定明月[1] 王铁军[1] 马隆龙[1] 王敏龙[3] 

机构地区：[1]中国科学院广州能源研究所,广东广州510640 [2]东莞理工学院能源与化工系,广东东莞523808 [3]中国科学院山西煤炭化学研究所,山西太原030001

出　　处：《燃料化学学报》2015年第7期839-845,共7页Journal of Fuel Chemistry and Technology

基　　金：国家自然科学基金(U1362109;51206172);国家重点基础研究发展规划(973计划;2013CB228105);广东省科技计划项目(2013B010405012);中国科学院战略性先导科技专项课题(XDA05010108)

摘　　要：基于溶剂热合成体系,制备了不同形貌的Fe3O4微球和纳米片催化剂,考察了水热合成条件对Fe3O4晶粒形貌的影响,并研究了Fe3O4纳米催化剂的费托合成(F-T)性能。结果表明,成核和晶体生长速率是控制Fe3O4晶体形貌的关键。与传统的沉淀铁催化剂相比,Fe3O4纳米催化剂更容易还原和向活性相转变,因此,具有更高的F-T反应活性、低碳烯烃选择性及C5+选择性;Fe3O4微球催化剂比纳米片催化剂更易维晶粒的稳定,具有更高的反应活性和稳定性。Two shape-defined nano-structured Fe3O4 catalysts such as Nano-Microsphere （FNM） and NanoFlake （FNF） were prepared by a simple solvothermal method. The effects of precursor type on Fe3O4 crystal morphology was studied. It is found that the rate of nucleation and crystal growth have a crucial influence on the particle morphology. Compared to the traditional Fe catalyst, the shape-defined nano Fe3O4 catalysts could be easily reduced and transferred into active phases, resulting in higher Fischer-Tropsch synthesis （F-T） activity and C5＋ selectivity. Especially, the FNM catalyst displayed higher catalytic activity and stability than the FNF catalyst. It was found that the FNF catalyst was more favorable to agglomeration because of shape change of the flakes. In addition, the results indicate that the hydrocarbon selectivity is strongly affected by the particle morphology.

关 键 词：Fe3O4纳米催化剂 晶体形貌 费托合成 

分 类 号：O643[理学—物理化学]