FeCoK催化剂上二氧化碳加氢合成低碳烯烃的研究

研究了多种催化剂上二氧化碳和加氢的反应性能，低碳烯烃的收率依次增加的次序为：ＦｅＣｏＫ〉ＦｅＣｏＭｎＫ〉ＦｅＣｏ〉Ｆｅ〉ＦｅＫ。由Ｍ（ＯＨ）３分解制备的ＦｅＣｏＫ催化剂性能优于碳酸盐Ｍ（ＣＯ３）和Ｍ（ＯＨ）２分解制备的催化剂；ｍ（Ｆｅ）：ｍ（Ｃｏ）：ｍ（Ｋ）＝１００：１００：５时烯烃收率最高。ＦｅＣｏＫ催化剂中添加ＭｎＯ，对烯烃的生成不利。通过不同反应条件下的实验，较佳的反应条件为：６２３Ｋ，１５

The Systhesis of Light Olefins from CO2 Hydrogenation on FeCoK Catalysts

FeCoK multicomponent catalysts were prepared by various coprecipitation methods and were used in the synthesis of light olefins by CO2 hydrogenation. The results show that the light olefins yield increase in the order of FeCoK > FeCoMnK > FeCo >Fe >FeK. The FeCoK catalyst from M(OH)3 decomposition is more effective for the light olefins yield than from M(OH)2 and M(CO3), the appropriate metallic composite of catalyst is Fe: Co; K=100: 100: 5. MnO addition to FeCoK catalysts is unfavorable for light olefins yield. It was found that the light olefins yield is higher at the condition of 623 K, 1500h-', CO2/H2= 3/l. The results of M5ssbauer studies illustrate that after reduction of FeCoK catalyst, FeCo alloy forms and transfers to iron carbides acting as activating phase,