Synthesis, characterization, and evaluation of the CO2 adsorption capacities of beta, ZSM-12, ZSM-48, and silicalite-1 zeolites obtained in the presence of tetraethylammonium hydroxide and 1,6-diaminohexane as organic structure-directing agents

IF 2.5 4区材料科学 Q2 CHEMISTRY, APPLIED Journal of Porous Materials Pub Date : 2024-04-01 DOI:10.1007/s10934-024-01603-x

Ilyes Bouledjouad, Djamal Dari, Rachid Ghezini, Fatiha Djafri, Mohamed Sassi

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Abstract

Zeolites synthesis using a combination of tetraethylammonium hydroxide (TEAOH) and 1,6-diaminohexane (DAH) as organic structure-directing agents (OSDAs) has been studied in order to understand how they acted during the synthesis. This combination can crystallize four zeolites: beta, ZSM-12, ZSM-48, and silicalite-1. TEAOH is found to direct the synthesis of beta, and ZSM-12 zeolites, whereas DAH directs the synthesis of ZSM-48 zeolite. On the other hand, the two organic components are found to have a cooperative role in the crystallization process of silicalite-1, with greater templating ability for TEAOH compared to DAH. The use of a supplementary organic component does not affect the degree of filling of the primary OSDA in the structure or the morphology of the obtained zeolites. The carbon dioxide (CO₂) adsorption capacity of the zeolites obtained was evaluated at a temperature of 293 K in a pressure range of 0 to 1 atm. The relationship between the surface properties of the zeolites and their adsorption behavior was studied. Beta zeolite had the highest adsorption capacity with 2.9 mmol/g, while ZSM-48 zeolite had the lowest adsorption capacity with only 0.7 mmol/g.

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在四乙基氢氧化铵和 1,6-二氨基己烷作为有机结构引导剂存在下获得的 beta、ZSM-12、ZSM-48 和硅胶-1 沸石的合成、表征和二氧化碳吸附能力评估

我们研究了使用四乙基氢氧化铵（TEAOH）和 1,6-二氨基己烷（DAH）作为有机结构引导剂（OSDA）的沸石合成，以了解它们在合成过程中的作用。这种组合可以使四种沸石结晶：β、ZSM-12、ZSM-48 和硅铝酸盐-1。研究发现，三乙醇可以引导 beta 和 ZSM-12 沸石的合成，而 DAH 则可以引导 ZSM-48 沸石的合成。另一方面，这两种有机成分在硅胶-1 的结晶过程中具有协同作用，与 DAH 相比，TEAOH 的模板能力更强。使用辅助有机成分不会影响主 OSDA 在结构中的填充程度，也不会影响所得沸石的形态。在温度为 293 K、压力范围为 0 至 1 atm 的条件下，对所获得的沸石的二氧化碳（CO2）吸附能力进行了评估。研究了沸石的表面特性与其吸附行为之间的关系。Beta 沸石的吸附容量最高，为 2.9 mmol/g，而 ZSM-48 沸石的吸附容量最低，仅为 0.7 mmol/g。

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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.