The present invention relates to a catalyst for synthesizing ethylenimine as well as a preparation method and application thereof. The related catalyst comprises a carrier and metal ions loaded on the carrier; the carrier is a composite oxide comprising titanium, silicon and phosphorus elements; the metal ions are magnesium ions, iron ions and cesium ions; the molar ratio of the magnesium ions to the iron ions to the cesium ions is (1-10):1:0.1; the mass of all metal ions is 0.5-10 percent of that of the carrier. In the related preparation method, a catalyst precursor is roasted at the temperature of 350-650° C., so that the catalyst is obtained; the catalyst precursor is the mixture of the carrier, soluble salt of magnesium, soluble salt of iron and soluble salt of cesium. The present invention also provides the application of the catalyst to synthesis of the ethylenimine by using amino alcohol as the raw material. Compared with a common catalyst which has the requirement on the temperature of over 400° C., the catalyst of the present invention obviously reduces the reaction temperature. The prepared catalyst can catalyze the intramolecular dehydration reaction of the amino alcohol and has relatively excellent selectivity.
本发明涉及一种用于合成
乙烯亚胺的催化剂,以及其制备方法和应用。相关催化剂包括载体和载载在载体上的
金属离子;所述载体是包含
钛、
硅和
磷元素的复合氧化物;
金属离子是
镁离子、
铁离子和
铯离子;
镁离子与
铁离子与
铯离子的摩尔比为(1-10):1:0.1;所有
金属离子的质量为载体质量的0.5-10%。在相关制备方法中,将催化剂前驱体在350-650°C的温度下烘烤,从而得到催化剂;催化剂前驱体是载体、可溶性
镁盐、可溶性
铁盐和可溶性
铯盐的混合物。本发明还提供了将该催化剂应用于以
氨基醇为原料合成
乙烯亚胺的方法。与对温度要求超过400°C的常规催化剂相比,本发明的催化剂显著降低了反应温度。制备的催化剂可以催化
氨基醇的分子内脱
水反应,并具有相对优异的选择性。