Large Crystals Synthesis of Siliceous Layered Zeolitic PLS-1 and CDS-1 Zeolite by Dry Gel Conversion Method
Large Crystals Synthesis of Siliceous Layered Zeolitic PLS-1 and CDS-1 Zeolite by Dry Gel Conversion Method
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DOI：
10.1002/crat.201800036
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发表时间：
2018-07-01
影响因子：
1.5
通讯作者：
Komura, Kenichi
中科院分区：
文献类型：
--
作者：
Banno, Shohei;Komura, Kenichi
采用干凝胶转化法（DGC），以层状硅酸盐H-kanemite和四甲基氢氧化铵（TMAOH）为有机结构导向剂（OSDA），成功地制备了CDS-1沸石前驱体--层状硅沸石PLS-1的大晶粒，并通过煅烧将其转化为CDS-1沸石。对所得CDS-1分子筛进行表征，发现其形貌与常规方法不同。其颗粒被发现是由反映PLS-1的沸石前体的层状晶体的增大的厚度聚集。在中压附近氮气吸附量的逐渐增加和FE-SEM测量强烈地表明，所获得的颗粒具有许多台阶和孔，如层状PLS-1大晶体的卡屋组装。
The large crystal of siliceous zeolitic layered PLS-1, which is a precursor of CDS-1 zeolite with CDO-type topology, can be successfully prepared by dry-gel conversion (DGC) method from a dry-gel containing layered silicate H-kanemite and tetramethylammonium hydroxide (TMAOH) as an organic structure-directing agent (OSDA), and it allows transform to CDS-1 zeolite by calcination with retaining its large crystal particle. Characterizations of the obtained CDS-1 zeolite reveal the different morphology compared by conventional methods. Its particle is found to be aggregated by an enlarged thickness of layered crystals reflecting a zeolitic precursor of PLS-1. Gradual increases of nitrogen adsorption at around middle pressure and FE-SEM measurements strongly indicate that the obtained particles have many steps and aperture like card-house assembly of layered PLS-1 large crystals.