纳米A型和FAU型沸石的合成及生长机理的研究进展

对有模板剂和无模板剂条件下纳米 A 型和 FAU 型沸石的合成方法及生长机理进行了综述。当合成液中无模板剂存在时,所得产物中仅部分颗粒粒径小于100 nm,且粒径分布较宽;当在合成液中添加模板剂时,合成出的纳米沸石粒径均一且容易控制。纳米 A 型和 FAU 型沸石合成机理的研究表明,无模板剂时,纳米 A 型沸石由无定形凝胶颗粒的随机聚集体晶化形成,纳米FAU 型沸石由大量小晶体随机聚集形成;有模板剂存在时,纳米 A 型与 FAU 型沸石均由分散的无定形凝胶颗粒晶化形成。开发在无需添加模板剂或尽量少用模板剂的条件下制备粒径小且分布窄的纳米沸石的新方法是今后的研究方向。

Progress in Synthesis of A Type and FAU Type Nano-Zeolite and Their Formation Mechanisms

Syntheses and formation mechanisms of nano-zeolite A type and FAU type crystals with tetramethylammonium hydroxide (TMAOH) as template or without any template were summarized.In the latter case only partial products were less than 100 nm in particle sizes,and their distributions were broad,but for synthesis with TMAOH,the process was easy and controllable to obtain nano-zeolite A type and FAU type crystals with narrow particle size distributions.From view point of formation mechanism in the process without ...