Sodium persulfate promoted interzeolite transformation of USY into SSZ-13 via a solid-state grinding route and its enhanced catalytic lifetime in the methanol-to-olefins reaction

Zhao, Xinqing; Niu, Li; Hao, Zongyi; Long, Xuefeng; Wang, Dongliang; Li, Guixian

doi:10.1007/s11144-021-02105-6

Cited by 6 publications

(1 citation statement)

References 33 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…羟基自由基在促进分子筛相转变方面也有一定的作用. Zhao 等 [38] 将超稳 Y 沸石(USY)作为原料之一, 与白炭黑、氢氧化钠、模板剂等混合研磨, 160 ℃晶化一定时间后, 即相转变至 SSZ-13 分子筛. 当向反应初始凝胶中加入一定量过硫酸钠(n(Na 2 S 2 O 8 )/n(SiO 2 )＝0.01)时, SSZ-13 的晶化时间缩短了 67%, 从 72 h 缩短至 24 h. NH 3 -TPD 结果表明, 过硫酸钠的引入可以调节 SSZ-13 的酸性, 减少了 SSZ-13 中强酸中心密度.…”

unclassified

Advances in Hydroxyl Free Radical Assisted Synthesis of Zeolite

Zhang¹,

Lan²,

Cheng³

2023

Acta Chimica Sinica

View full text Add to dashboard Cite

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]

show abstract

unclassified