过渡金属改性HZSM-5催化剂的乳酸乙酯脱水性能  

Catalytic Dehydration of Ethyl Lactate over HZSM-5 Modified with Transition Metal

作　　者：张卓[1] 林鹿[1] 施建斌[1] 

机构地区：[1]华南理工大学制浆造纸工程国家重点实验室,广东广州510640

出　　处：《化学反应工程与工艺》2009年第6期571-575,共5页Chemical Reaction Engineering and Technology

基　　金：国家自然科学基金(50776035;U0733001);教育部博士点基金(20070561038);863计划(2007AA05Z408);国家科技支撑计划资助项目(2007BAD34B01)

摘　　要：分别采用FeCl3.6H2O和MnCl2.4H2O对HZSM-5分子筛进行改性,得到Fe-ZSM-5和Mn-ZSM-5催化剂,采用X射线衍射(XRD)和傅立叶红外光谱(FT-IR)对改性前后的样品进行表征,并考察了HZSM-5分子筛改性前后在乳酸乙酯脱水制丙烯酸乙酯反应中的催化性能。结果表明,与HZSM-5相比,改性后的Fe-ZSM-5和Mn-ZSM-5的结晶度下降,硅铝比降低,活性降低,选择性增加,且Mn-ZSM-5的催化性能优于Fe-ZSM-5的催化性能,在180℃下反应3 h,丙烯酸乙酯收率达到14.65%。The catalysts Fe-ZSM-5 and Mn-ZSM-5 were prepared by modifying HZSM-5 molecular sieve using FeCl3·6H2O and MnCl2·4H2O,respectively,and were characterized by means of X-ray diffraction(XRD) and Fourier infrared spectroscopy(FT-IR).Then the catalytic performance of HZSM-5 molecular sieve,Fe-ZSM-5 and Mn-ZSM-5 for conversion of ethyl lactate to ethyl acrylate were investigated.The results showed that,compared with HZSM-5 molecular sieve,the degree of crystallization,the molar ratio of SiO2 to Al2O3 and the activity of Fe-ZSM-5 and Mn-ZSM-5 decreased and the selectivity increased.The calalytic performance of Mn-ZSM-5 was better than that of Fe-ZSM-5 and the yield of ethyl acrylate reached 14.65% after reaction 3 h at 180 ℃.

关 键 词：分子筛 改性 乳酸乙酯 脱水 

分 类 号：TQ225.24[化学工程—有机化工]