摘要
对由脂肪酸甲酯加氢制备高碳醇的Ｃｕ－Ｆｅ系催化剂进行了Ｂ．Ｅ．Ｔ．比表面测定，ＸＲＤ，ＴＧ－ＤＴＡ－ＤＴＧ和Ｍｏ¨ｓｓｂａｕｅｒ谱学及与活性数据关联的研究．Ｂ．Ｅ．Ｔ．比表面与焙烧温度及活性的关系研究指出，在４８０℃下焙烧的催化剂，比表面适中，活性最高．ＸＲＤ、ＴＧ－ＤＴＡ－ＤＴＧ及Ｍｏ¨ｓｓｂａｕｅｒ谱学研究指出，催化剂氧化态物相为ＣｕＯ，γ－Ｆｅ２Ｏ３和ＭｇＯ；在反应条件下，ＣｕＯ首先被还原为金属态的铜（Ｃｕ０），接着，γ－Ｆｅ２Ｏ３被还原为Ｆｅ３Ｏ４．催化剂中Ｆｅ组分以γ－Ｆｅ２Ｏ３物相存在，在反应条件下还原为Ｆｅ３Ｏ４，有利于提高催化剂的活性．催化剂的活性与其还原行为密切相关。
The relations of activity and surface area,phases and reduction behavior of the Cu Fe catalysts for hydrogenation of fatty acid methyl esters to prepare higher alcohols has carried out by means of surface area (B.E.T) measurement, XRD,TG-DTA, Mossbauer spectra and activity determination.The study on the relations between the surface area (B.E.T.)and the activity shows that when calcination temperature of the catalysts is about 480℃,the surface area is mediate and the activity is the highest.The study of the XRD TG DTA and M o ¨ssbauer speectra shows that phases of oxidization state of the catalysts are CuO γ Fe 2O 3 and Mgo.Under reaction conditions of hydrogenation,the CuO is firstly reduced to Cu 0 and then the γ Fe 2O 3 is reduced to Fe 3O 4.The study of the relations of the activity and the phases and the reduction behavior shows that Fe exists in the form of γ Fe 2O 3 and is reducced to Fe 3O 4 under reaction conditions and all these are helpful to increase the activity.Activity variation of the catalysts is synchronous with their reduction behavior,and the newly formed Cu°and Fe 3O 4 under reaction conditions are active species of the catalysts.
出处
《郑州大学学报（自然科学版）》
CAS
1997年第1期72-77,共6页
Journal of Zhengzhou University (Natural Science)
关键词
活性
还原行为
比表面
物相
铜铁系
催化剂
Cu Fe catalysts
Hydrogenation
Higher alcohols
Phases
Activity
