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Zeolite Seeds: Third Type of Structure Directing Agents in the Synthesis of Zeolites
Comments on Inorganic Chemistry ( IF 5.4 ) Pub Date : 2015-12-17 , DOI: 10.1080/02603594.2015.1031375
Yanyan Ji , Yeqing Wang , Bin Xie , Feng-Shou Xiao

Zeolites have been widely applied in the industrial processes and their syntheses normally require the presence of templates, structure-directing agents (SDA). The first type of SDA is inorganic cations such as sodium, and the second type is organic cations such as organic ammonium, which direct the crystallization of zeolites. In this review, we briefly summarize recent works on the organotemplate-free syntheses of zeolites in the presence of zeolite seeds, where the zeolite seeds direct the crystallization of zeolite crystals. Therefore, the zeolite seeds in the seed-directed synthesis (SDS) routes are reasonably considered to be a third type of SDA. We focus here on the SDS syntheses of zeolites with abundant Al sites, high-silica zeolites, and pure silica zeolites, as well as the use of exotic zeolite seeds. Compared with organic SDAs, the use of zeolite seeds in organotemplate-free synthesis not only significantly reduces zeolite cost but also completely avoids calcination of organic SDAs in zeolites for opening micropores. More importantly, this SDS approach is universal and simple for synthesizing a series of aluminosilicate zeolites.



中文翻译:

沸石种子:沸石合成中的第三种结构导向剂

沸石已广泛应用于工业过程中,其合成通常需要模板,结构导向剂(SDA)的存在。第一种类型的SDA是无机阳离子(例如钠),第二种类型是有机阳离子(例如有机铵),它们指导沸石的结晶。在这篇综述中,我们简要总结了在存在沸石晶种的情况下有关沸石的无有机模板合成的最新工作,其中沸石晶种指导沸石晶体的结晶。因此,在种子定向合成(SDS)路线中的沸石种子被合理地认为是SDA的第三种类型。在这里,我们将重点介绍铝位点丰富的沸石,高硅沸石和纯硅沸石的SDS合成,以及外来沸石种子的使用。与有机SDA相比,在无有机模板的合成中使用沸石种子不仅显着降低了沸石成本,而且完全避免了沸石中有机SDA的煅烧以打开微孔。更重要的是,这种SDS方法对于合成一系列硅铝酸盐沸石而言是通用且简单的。

更新日期:2015-12-17
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