Preparation and structural characterization of disordered Na-gallosilicate zeolite with natrolite framework and its K+ and NH4+ exchanged analogues

IF 2.5 4区材料科学 Q2 CHEMISTRY, APPLIED

Journal of Porous Materials Pub Date : 2024-05-27 DOI:10.1007/s10934-024-01631-7

Manjusha J. Gavhane, R. K. Jha, Kyung-Wan Nam, Deu S. Bhange

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引用次数: 0

Abstract

We report first time preparation and crystal structure of NH₄⁺ exchanged form of highly disordered gallosilicate zeolite with natrolite framework (NAT) by ion exchange method from K-gallosilicate zeolite with natrolite framework. K⁺ exchanged form was obtained by ion exchange with hydrothermally prepared highly disordered sodium gallosilicate zeolite with natrolite framework. Phase purity, degree of ion exchange, particle morphology, elemental mapping and thermal behaviour of Na-, K-, NH₄-gallosilicate zeolites were investigated using various instrumental techniques. Crystal structures of Na-, K-, NH₄-gallosilicate zeolites were obtained by Rietveld analysis of powder X-ray diffraction data collected using synchrotron source of X-rays. Refined structural models of hydrated Na-, K-, NH₄-gallosilicate zeolites were compared. NH₄-gallosilicate zeolite was calcined at 450 °C to obtain its H-form. The structure collapse of H-gallosilicate zeolite with natrolite framework is commented finally based on the structural characterization data.

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具有钠沸石骨架的无序钠镓硅酸盐沸石及其 K+和 NH4+交换类似物的制备与结构表征

我们首次报道了通过离子交换法从具有纳特罗拉特框架的 K-五倍子硅酸盐沸石制备出 NH4+ 交换形式的具有纳特罗拉特框架的高度无序五倍子硅酸盐沸石（NAT）及其晶体结构。K+ 交换形式是通过与水热法制备的具有钠沸石框架的高度无序五倍子硅酸钠沸石进行离子交换而获得的。利用各种仪器技术对 Na-、K-、NH4-五倍子硅酸盐沸石的相纯度、离子交换程度、颗粒形态、元素图谱和热行为进行了研究。通过对使用同步辐射 X 射线源收集的粉末 X 射线衍射数据进行里特维尔德分析，获得了 Na-、K-、NH4-高硅酸盐沸石的晶体结构。比较了水合 Na-、K-、NH4-高硅酸盐沸石的改进结构模型。NH4-allosilicate 沸石在 450 °C 煅烧后得到 H 型。根据结构表征数据，最后对具有纳洛石框架的 H 型allosilicate 沸石的结构坍塌进行了评论。

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来源期刊

Journal of Porous Materials 工程技术-材料科学：综合

CiteScore

4.80

自引率

7.70%

发文量

203

审稿时长

2.6 months

期刊介绍： The Journal of Porous Materials is an interdisciplinary and international periodical devoted to all types of porous materials. Its aim is the rapid publication of high quality, peer-reviewed papers focused on the synthesis, processing, characterization and property evaluation of all porous materials. The objective is to establish a unique journal that will serve as a principal means of communication for the growing interdisciplinary field of porous materials. Porous materials include microporous materials with 50 nm pores. Examples of microporous materials are natural and synthetic molecular sieves, cationic and anionic clays, pillared clays, tobermorites, pillared Zr and Ti phosphates, spherosilicates, carbons, porous polymers, xerogels, etc. Mesoporous materials include synthetic molecular sieves, xerogels, aerogels, glasses, glass ceramics, porous polymers, etc.; while macroporous materials include ceramics, glass ceramics, porous polymers, aerogels, cement, etc. The porous materials can be crystalline, semicrystalline or noncrystalline, or combinations thereof. They can also be either organic, inorganic, or their composites. The overall objective of the journal is the establishment of one main forum covering the basic and applied aspects of all porous materials.