CO_2加氢制低碳烯烃Fe/Silicalite-2催化剂研究 Ⅱ.催化剂制备研究

铁是ＣＯ２加氢制低碳烯烃的催化活性组分，其含量的增加将明显提高ＣＯ２转化率和反应产物中烃类摩分率；ＭｎＯ是Ｆｅ／Ｓｉ－２催化剂ＣＯ２加氢制低碳烯烃的有效助剂，提高ＭｎＯ含量，有利于提高ＣＯ２加氢制低碳烯烃的选择性，尤其可明显提高烃类产物中的烯、烷比值。结果还表明，ＭｎＯ助剂对甲烷生成量的影响不明显；而Ｋ２Ｏ助剂则可抑制甲烷生成，从而进一步提高低碳烯烃选择性，表明ＭｎＯ和Ｋ２Ｏ是Ｆｅ／Ｓｉ－２催化剂ＣＯ２加氢制低碳烯烃的重要助剂。

Study of Fe/Silicalite 2 catalyst for CO 2 hydrogenation to light olefins Ⅱ.Research on the preparation of the catalyst

Fe is an active component of the catalyst for CO 2 hydrogenation to hydrocarbons.An increment of its loading content can enhance CO 2 conversion and hydrocarbon formation.However,an ambiguous effect on the selectivity to light olefins in hydrocarbon products is observed.Adding MnO as a promoter to the Fe/Si 2 catalyst for CO 2 hydrogenation obviously increases the selectivity to light olefins, especially olefin/paraffin ratio,but CH 4 yield and CO formation are insensitive to MnO as well as CO 2 conversion.K 2O is another vital promoter of the Fe/Si 2, with which added to the catalyst,the selectivity to light olefins increases greatly, while CH 4 formation is inhibted evidently. Meanwhile, a considerable increment of CO 2 conversion is observed with the addition of K 2O. Thus, it has been manifested that both MnO and K 2O are important promoters of the Fe/Si 2 catalyst for CO 2 hydrogenation to produce light olefins.