Experimental and numerical investigation of the effect of ultrasound on the growth kinetics of zeolite A

Dewes, Ruben M; Mendoza, Heidy Ramirez; Pereira, Mafalda Valdez Lancinha; Lutz, Cécile; Gerven, Tom Van

doi:10.1016/j.ultsonch.2022.105909

Cited by 7 publications

(1 citation statement)

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“…•OH＋•H→H2O (10) [50] Figure 6 Schematic illustration of radicalized seed assisted synthesis of zeolite ECR-1 [50] 解决煤矸石积累和污染问题, 同时也提高了煤矸石的附加值. Han 等 [54] 图 7 超声波辐射辅助 ZSM-5 合成的示意图 [55] Figure 7 Schematic illustration of ultrasonic radiation assisted synthesis of ZSM-5 [55] 化学学报综述 Dewes 等 [56] 使用不同功率的超声波辐射辅助 NaA 沸石的合成, 并使用 Gualtieri 动力学模型研究了其结晶过程. 在固定 10 min 的处理时间后, NaA 沸石在超声波辐射功率为 0.…”

Section: 超声波辐射辅助生成•Ohunclassified

Advances in Hydroxyl Free Radical Assisted Synthesis of Zeolite

Zhang¹,

Lan²,

Cheng³

2023

Acta Chimica Sinica

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As one of the most important solid catalysts in chemical industry, zeolites are widely used in different fields. How to prepare zeolites greenly and efficiently has become a research hot issue with the increase of consumption year by year. Hydroxyl free radical is a highly active species, which can promote the depolymerization and repolymerization of aluminosilicates in the zeolite initial gel, and then accelerating the zeolite crystallization process. Besides accelerating the crystallization of zeolite, many studies have shown hydroxyl free radicals have other functions in zeolite synthesis. In this review, the role of hydroxyl free radicals in the synthesis of zeolites is systematically introduced via different generation methods. The challenges of the hydroxyl free radical assisted strategy are put forward, and its development directions are prospected. Keywords zeolite; hydroxyl free radical; structure directing agent; synthesis; acceleration 1 引言传统沸石是一类由硅氧四面体和铝氧四面体组成的结晶微孔材料 [1] , 随着沸石工业和制备技术的不断发展, 沸石分子筛的化学组成也已经扩展到其他四配位原子, 例如非金属磷和硼, 金属锡、镓和锗, 过渡金属锌、铁和钛等. 不同 TO 4 四面体的连接方式导致了基于不同组成的沸石分子筛骨架类型的多样性. 到目前为止, 国际分子筛协会认定的分子筛拓扑结构已达 255 种. 根据其孔道窗口, 沸石分子筛被分为小孔分子筛(≤8 元环), 中孔分子筛(10 元环), 大孔分子筛(12 元环)及超大孔分子筛(＞12 元环) [2] . 因其规则的孔道结构、独特的择形性、可调节的酸性位点和较高的水热稳定性, 沸石分子筛材料作为非均相催化剂、吸附剂和离子交换剂等在现代化学工业和石油化工领域发挥着极其重要的作用 [3] . 近年来, 随着合成方法和表征技术的不断进步, 许多新型沸石分子筛材料被制备出来, 拓展了分子筛的应用范围, 如生物质转化 [4] 、燃料电池 [5] 、热能储存 [6] 、二氧化碳捕获和转化 [7] 、空气污染修复 [8] 和水的净化 [9] 等.20 世纪 40 年代, Barrer [10]

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