燃料化学学报2016，Vol.44Issue(4)：449-456,8.
K/MgFeZn-HTLcs催化CO加氢制低碳烯烃性能研究
Direct synthesis of light olefins from CO hydrogenation over K/MgFeZn-HTLcs catalysts
摘要
Abstract
A series of K promoted K/MgFeZn-HTLcs catalysts with different Mg/Fe/Zn molar ratios were prepared by means of precipitation method and impregnation method for the direct synthesis of light olefins from CO hydrogenation. The samples were characterized by N2 adsorption-desorption SEM, TG, XRD, XPS and H2-TPR measurements. The results showed that the MgFeZn-HTLcs catalyst precursors have typical lamellar structure, larger specific surface area and average pore diameter compared with Fe/Zn catalyst. The BET surface area and the average pore diameter decreased after calcination and K promotion. The bulk composition of the calcined samples was mainly metal oxide and ferrite. Fe5 C2 , MgCO3 and ZnO were formed in K/MgFeZn-HTLcs catalysts after reaction. However, the main phase in K/2Fe-1Zn catalyst was stabilized in ZnFe2 O4 . During CO hydrogenation, the prepared samples showed high C=2-4 selectivity and low C+5 weight fraction compared with that of K/2Fe-1Zn sample. The product distribution was greatly improved. Over the sample K/2Mg-2Fe-1Zn, an olefin to paraffin ratio of 5. 15 and the C=2-4 weight olefin content of 48. 56% could be obtained.关键词
费托合成/K/MgFeZn-HTLcs催化剂/CO加氢/低碳烯烃Key words
Fischer-Tropsch synthesis/K/MgFeZn-HTLcs catalyst/CO hydrogenation/light olefins分类
化学化工引用本文复制引用
马丽萍,张建利,马清祥,范素兵,赵天生..K/MgFeZn-HTLcs催化CO加氢制低碳烯烃性能研究[J].燃料化学学报,2016,44(4):449-456,8.基金项目
The project was supported by Ningxia Natural Science Foundation of China (NZ13010).@@@@宁夏自然科学基金(NZ13010)资助 （NZ13010）
