燃料化学学报2017，Vol.45Issue(12)：1489-1498,10.
层状K/Mg-Fe-Al催化剂的制备及其CO加氢性能研究
Preparation of layered K/Mg-Fe-Al catalysts and its catalytic performances in CO hydrogenation
摘要
Abstract
A series of K promoted K/MgFeAl-HTLcs catalysts with different Mg/Fe/Al molar ratios were prepared by means of coprecipitation and impregnation method for direct synthesis of light olefins from CO hydrogenation. The samples were characterized by XRD, N2 adsorption-desorption, SEM, TG, H2-TPR and XPS measurements. The results show that MgFeAl-HTLcs catalyst precursors has typical layered structure. MgO, Fe2 O3 and small amount of MgFeAlO4 are formed after calcination. MgCO3 and Fe3 O4 could be observed after reaction, and a little Fe5 C2 iron carbide with broad and weak peaks appear simultaneously. Thermal stability of K/MgFeAl-HTLcs is improved due to recovery of hydrotalcite-like structure after K promotion. With increase of Al content, specific surface area of the precursors decreases monotonically after structure reconstruction. Reduction of Fe2 O3 to Fe3 O4 is inhibited with addition of Al, compared with K/Mg-Fe sample. Fe enrichment before reaction and K enrichment after reaction are observed on secondary calcination samples. During CO hydrogenation, the prepared samples show high activity and C=2-4 selectivity with low C5+ weight fraction. C5+hydrocarbons decrease and olefin selectivity increases with increasing Fe/Al molar ratio. The C5+decreases from 22 . 17% to 10 . 90%, and C=2-4 weight content increases from 40 . 98% to 47 . 28% on K/1 . 5 Mg-0 . 67 Fe-0 . 33 Al sample compared with that of K/1. 5Mg-0. 67Fe sample.关键词
费托合成/K/Mg-Fe-Al催化剂/CO加氢/低碳烯烃Key words
Fischer-Tropsch synthesis/K/Mg-Fe-Al catalyst/CO hydrogenation/light olefins分类
化学化工引用本文复制引用
张建利,王旭,马丽萍,于旭飞,马清祥,范素兵,赵天生..层状K/Mg-Fe-Al催化剂的制备及其CO加氢性能研究[J].燃料化学学报,2017,45(12):1489-1498,10.基金项目
The project was supported by the National Natural Science Foundation of China (21666030, 21366025) and the National First-Rate Discipline Construction Project of Ningxia ( Chemical Engineering and Technology) .国家自然科学基金(21666030, 21366025)和"化学工程与技术"国内一流学科建设项目资助 （21666030, 21366025）
