无有机模板条件下晶种导向合成微孔分子筛晶体材料  

Seed-Directed and Organotemplate-free Synthesis of Zeolites

作　　者：张海燕[1] 杨承广[1] 孟祥举[2] 肖丰收[2] 

机构地区：[1]吉林大学化学学院无机合成与制备化学国家重点实验室,长春130012 [2]浙江大学化学系浙江省应用化学重点实验室,杭州310028

出　　处：《化学学报》2012年第23期2387-2392,共6页Acta Chimica Sinica

基　　金：国家自然科学基金(No.21273197)资助~~

摘　　要：沸石分子筛晶体材料(例如Beta,ZSM-34)由于具有独特的物理及化学性质,被广泛应用于催化、吸附与分离、离子交换等领域.一般来说,大多数分子筛晶体材料需要在有机模板剂存在的条件下合成.然而,有机模板剂的使用会带来很多问题,例如,提高分子筛晶体材料的合成成本、在高温煅烧去除模板剂的过程中,消耗大量的能量以及带来环境污染.因此,开发无有机模板剂合成沸石分子筛新路线具有十分重要的研究意义和实用价值.近年来,我们研究小组首先开发了无有机模板条件下晶种导向合成分子筛的新方法,相继合成出了Beta,ZSM-34,FER和LEV等微孔分子筛晶体材料.将对这几种沸石的合成进行简要的评论.Zeolites with unique physical and chemical properties, such as Beta, ZSM-34 have been extensively studied for a long time as important materials in the chemical industries such as shape selective catalysis, adsorption, ion exchange etc. Normally, most of zeolites were synthesized in the presence of organic templates, and the use of them usually results in more or less shortcomings including high cost of organic templates and production of environmentally undesirable gases by high temperature calcination for removing these organic templates, which strongly influence their applications. Thus, it is very important to develop an organotemplate-free route for synthesizing zeolites. Addition of seeds crystals has been demonstrated as an effective method to accelerate the crystallization of zeolite, improving the purity of the crystal product. Based on the effect of seeds, we have successfully developed a seed-directed and organotemplate-free （SDS） synthesis of zeolites such as Beta, FER, ZSM-34 and LEV, where zeolite seeds play similar roles to the ＂templates＂ that direct crystallization of zeolites from the amorphous aluminosilicate gels. When no zeolites seeds were added, the product is amorphous products at the same condition. As a common process for the synthesis of these zeolites in the absence of organic templates, aluminum and alkali sources were dissolved into H20, followed by addition of fumed silica. After stirring at room temperature for 5 h, zeolite seeds were introduced into the aluminosilicate gel. After further stirring for 5 min, the mixture was transferred into an auto- clave for crystallization. After filtrating, washing with deionized water and drying, zeolite products were obtained. The calci- nation of the sample for removing organic templates could be fully avoided due to the absence of organic template. In the present article, we show the recent results about the synthesis and characterizations of zeolites including Beta, FER, ZSM-34 and LEV using this SDS route.

关 键 词：分子筛 沸石晶体材料 无有机模板剂 晶种导向合成 

分 类 号：O643.36[理学—物理化学]