钴含量对铁钴双金属催化剂的费-托合成催化性能的影响  

Performance of Fe-Co bimetallic catalysts with different and low Co contents for Fischer-Tropsch synthesis

作　　者：顾榜[1] 金亚美[1] 徐程[1] 李金林[1] 

机构地区：[1]中南民族大学催化材料科学湖北省暨国家民委教育部共建重点实验室,武汉430074

出　　处：《华中师范大学学报（自然科学版）》2012年第5期577-581,共5页Journal of Central China Normal University：Natural Sciences

基　　金：国家自然科学基金项目(21073238)

摘　　要：制备了一系列钴含量为0.5wt%、1.0wt%、1.5wt%的铁钴双金属催化剂,并结合X-射线衍射、X-射线光电子能谱、氢气程序升温还原、氢气程序升温脱附和氧滴定等一系列表征手段,研究了不同含量的钴对铁钴双金属催化剂的结构和费-托合成反应催化性能的影响.结果表明少量钴的加入促进了铁的还原,但较高含量(1.5wt%)的钴使得催化剂表面形成了少量的CoFe2O4物种,钴铁之间相互作用增强导致1.5Co-Fe的还原度降低但分散得更好.铁钴的混合改变了催化剂表面的化学性质,钴的加入使催化剂的低温氢气吸附性能增强.A series of Fe-Co bimetallic catalysts with different and low Co contents of0.5wt%, 1.0wt%, 1.5wt% have been synthesized. The catalysts were characterized by X-ray diffraction （XRD）, X-ray photoelectron spectroscopy, hydrogen temperature programmed reduction （H2-TPR）, hydrogen temperature programmed desorption （H2- TPD） and oxygen titration, and their catalytic activities for FTS were measured in a fixed bed reactor. The addition of a small amount of Co promoted the reduction of Fe. However, catalyst with higher Co content （1.5 wt%） leads to formation of some CoFe204 species on the surface. The stronger interaction between Fe and Co decreased the reducibility but increased the dispersion of catalyst. The surface properties of the catalysts have been changed by the mixing of Fe and Co. The addition of Co increased the absorption ability of hydrogen at low temperature.

关 键 词：费-托合成 铁钴双金属催化剂 钴含量 

分 类 号：O614.8[理学—无机化学]