氧化锆负载氧化铁催化剂上CO加氢反应的研究钾，锰，镧，铈的助剂作用

Hydrogenation of CO on Zirconia Supported Iron Catalysts Promoting Effects of Potassium,Manganese,Lanthanum and Cerium Oxides

应用Ｘ－射线衍射（ＸＲＤ），程序升温还原（ＴＰＲ），穆斯堡尔谱（ＭＢＳ）以及ＣＯ＋Ｈ＿２催化反应性能测试等手段研究了Ｋ，Ｍｎ，Ｌａ，Ｃｅ四种助剂对Ｆｅ＿２Ｏ＿３／ＺｒＯ＿２催化剂结构、还原行为以及ＣＯ＋Ｈ＿２反应催化性能的影响。结果表明，助剂的类型具有明显影响，适当助剂的加入可以明显提高催化剂的ＣＯ转化率，降低甲烷选择性，提高低碳烃选择性。１．Ｋ助剂：碱性助剂Ｋ的加入对催化剂的结构影响很小，但使催化剂的还原变难，在ＣＯ加氢反应中提高了催化剂的催化活性和低碳烯烃的选择性，并降低了甲烷的选择性。２．Ｍｎ助剂：Ｍｎ助剂的加入明显提高了铁的分散度，并使得Ｆｅ＿２Ｏ＿３的还原变得困难，在ＣＯ＋Ｈ＿２反应中提高了催化剂的催化活性和低碳烯烃的选择性，抑制了甲烷的生成。３．Ｌａ助剂：新物相ＬａＦｅＯ＿３的生成促进了ＣＯ的解离，提高了ＣＯ转化率，但产物中甲烷的选择性也随之增加。４．Ｃｅ助剂：Ｃｅ助剂对催化剂结构的影响与Ｍｎ助剂相似，助剂的加入明显提高了铁的分散度，也使得Ｆｅ＿２Ｏ＿３的还原变得较为困难。在ＣＯ加氢反应中提高了催化剂的催化活性和低碳烯烃的选择性，并降低了甲烷的选择性。

The structure,reduction behavior and catalytic properties of Fe_2O_3/ZrO_2 catalysts promoted with K,Mn, La and Ce ions, respectively, have been studied by XRD, TPR Mossbauer spectroscopy, and CO hydrogenation catalytic reaction.It is shown that addition of the above ions exerts great influence on the catalytic properties of the catalyst. In all cases, the specific activities of Fe_2O_3/ZrO_2 for CO hydrogenation are enhanced, but the change in selectivity is different from one to another. Based on the nature of the interactions between the additives and the active components,the promoting effects of these additives are discussed.