改性HZSM-5催化乙二醇乙醚合成及失活机理  

Deactivation Mechanism of Modified HZSM-5 for the Synthesis of Glycol Ether

作　　者：李刚森[1,2] 张栋[1] 章亚东[1] 

机构地区：[1]郑州大学化工与能源学院,河南郑州450001 [2]郑州轻工业学院材料与化学工程学院,河南郑州450001

出　　处：《精细化工》2015年第6期715-720,共6页Fine Chemicals

摘　　要：以乙二醇和乙醇为原料,采用硫酸铵改性的HZSM-5(MHZSM-5)作催化剂合成了乙二醇乙醚和乙二醇二乙醚,乙二醇的转化率高达69.1%,乙二醇乙醚和乙二醇二乙醚的选择性分别为72.9%和25.3%。结果表明,MHZSM-5具有良好的催化效果,但重复使用时催化剂的活性降低较快。采用X射线衍射仪(XRD),NH3-TPD,扫描电子显微镜(SEM),电子能谱(EDS),比表面积及孔径测定仪(BET法)和热重/差热分析仪(TG)对催化剂的晶型结构、表面形貌、酸度、元素变化、比表面及孔径进行了表征。结果表明,催化剂的失活主要是由催化剂表面积碳引起的孔道堵塞和表面S元素的流失造成,整个使用过程中催化剂的晶型结构未发生明显变化。Ammonium sulfate modified HZSM-5 was used for the synthesis of glycol ether, which exhibited excellent catalytic activity. The conversion of ethylene glycol was up to 69. 1% , and the selectivity of ethylene glycol monoethyl ether and ethylene glycol diethyl ether was 72. 9% and 25.3 %, respectively. However, the activity of the catalyst decreased significantly after regeneration. The crystal structure, surface morphology, element, acidity, specific surface area and pore size of the catalyst were characterized by means of X-ray diffraction （ XRD）, temperature-programmed desorption of NH3 （ NH3-TPD） , scanning electron microscopy （ SEM ）, energy dispersive spectroscopy （ EDS）, Brunner- Emmit-Teller （BET） and thermogravimetry （TG）. The results show that the deactivation of the catalyst is mainly due to the blockage of the pore caused by carbon deposition on the surface, and the loss of S on the surface, and that the crystal structure of the catalyst had no change during the whole process

关 键 词：乙二醇 乙二醇乙醚 浸渍 HZSM-5 硫酸铵 催化剂 失活 精细化工中间体 

分 类 号：TQ032.4[化学工程] O643.36[理学—物理化学]