硅铝胶老化温度对气相转移法合成MCM-22分子筛的影响  

Effect of Aluminosilica Gel Aging Temperature on Synthesis of MCM-22 Molecular Sieves by Vapor-Phase Transfer

作　　者：刘星生[1] 李英霞[2] 

机构地区：[1]江西师范大学化学化工学院,江西南昌330022 [2]北京化工大学化工资源有效利用国家重点实验室,北京100029

出　　处：《石油化工》2011年第1期34-37,共4页Petrochemical Technology

基　　金：国家自然科学基金项目(20676011)

摘　　要：以硅酸为硅源、偏铝酸钠为铝源制备硅铝胶,采用气相转移法(VPT)合成了MCM-22分子筛。采用TG-DTA,^(27)AlMAS NMR,^(29)Si MAS NMR等方法对硅铝胶进行了表征,讨论了硅铝胶老化温度对硅铝胶结构及合成MCM-22分子筛的影响。实验结果表明,硅铝胶老化温度的改变影响硅铝胶的含水量和Si的存在形式,导致在合成MCM～22分子筛过程中硅铝胶能够提供的结构单元不一样,从而影响MCM-22分子筛的合成。硅铝胶老化温度为80℃时,硅铝胶的含水量最高,Si的存在形式更具多样性,有利于硅铝胶后期的晶化合成。MCM-22 molecular sieves were synthesized through vapor-phase transfer method （VPT） from hexamethylene imine and aluminosilica gels which were prepared from silicic acid and sodium metaaluminate. The aluminosilica gels were characterized by means of TG-DTG, ^27Al MAS NMR and 295i MAS NMR. Effects of aging temperature of the aluminosilica gel on its structure and MCM-22 molecular sieve synthesis were investigated. The results showed that the aging temperature change affected the H20 content and the Si form in the aluminosilica gel, which could provide different structural units in the MCM-22 molecular sieve synthesis. When the aluminosilica gel aging temperature was 80℃, the H20 content was the maximum and the aluminosilica gel with diversity of the Si form was prepared, which was beneficial to the crystallization process in the MCM-22 molecular sieve synthesis.

关 键 词：硅铝胶 老化温度 气相转移法 MCM-22分子筛 

分 类 号：TQ424.25[化学工程]