Development of the crystallinity model and investigation of the effective factors on the crystallinity of zeolite Y using the response surface method

IF 1.2 4区地球科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Physics and Chemistry of Minerals Pub Date : 2023-09-01 DOI:10.1007/s00269-023-01251-8

Mohammad Reza Ranjbar Toroghi, Mehdi Panahi, Mehdi Karimi, Ali Nakhaeipour, Ali Mohammadi

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Abstract

In this study, zeolite Y was synthesized from sodium silicate, aluminum hydroxide, sodium hydroxide and distilled water under hydrothermal method. The Box–Behnken design was used as a response surface method considering seven factors affecting the crystallization of zeolite to determine the number of experiments. The linear, square and interaction effects of the factors were investigated. The factors consist of four factors for the gel composition, including the molar value of Si, Al, Na and H₂O and three factors for the synthesis conditions, including aging time, crystallization time and temperature. The XRD patterns of the synthesized samples were compared with the XRD pattern of standard zeolite Y. Among the samples, sample 50 with the highest intensity and maximum total area of 14 peaks, was selected as the reference sample and it was used to determine the relative crystallinity percentage of the remaining samples. Based on the results of the experiments, it was concluded that changes in the gel composition have a more significant effect on the response in comparison with changes in the synthesis conditions. In addition, optimization of the obtained model was carried out and a zeolite with higher relative crystallinity than the standard zeolite Y was synthesized. At the optimal point, zeolite Y was synthesized with a relative crystallinity of 117.5%. The composition of the gel was 0.59 SiO₂: 0.0563 Al₂O₃: 0.4266 Na₂O: 12.376 H₂O. The total synthesis time was 30 h.

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响应面法建立Y分子筛结晶度模型及影响结晶度因素的研究

以水玻璃、氢氧化铝、氢氧化钠和蒸馏水为原料，水热法制备Y型沸石。采用Box-Behnken设计作为响应面法，考虑影响沸石结晶的7个因素，确定实验次数。考察了各因素的线性效应、平方效应和交互效应。影响凝胶组成的因素包括硅、铝、钠和水的摩尔值4个因素和合成条件的因素包括时效时间、结晶时间和温度3个因素。将合成样品的XRD谱图与标准沸石y的XRD谱图进行比较。其中选取强度最高、总面积最大的14峰50号样品作为参比样品，测定剩余样品的相对结晶度。实验结果表明，凝胶组成的变化对反应的影响比合成条件的变化更为显著。并对所得模型进行了优化，合成了一种相对结晶度高于标准Y型沸石的分子筛。在最佳点合成Y型沸石，相对结晶度为117.5%。凝胶的组成为0.59 SiO2: 0.0563 Al2O3: 0.4266 Na2O: 12.376 H2O。总合成时间为30 h。

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来源期刊

Physics and Chemistry of Minerals 地学-材料科学：综合

CiteScore

2.90

自引率

14.30%

发文量

审稿时长

3 months

期刊介绍： Physics and Chemistry of Minerals is an international journal devoted to publishing articles and short communications of physical or chemical studies on minerals or solids related to minerals. The aim of the journal is to support competent interdisciplinary work in mineralogy and physics or chemistry. Particular emphasis is placed on applications of modern techniques or new theories and models to interpret atomic structures and physical or chemical properties of minerals. Some subjects of interest are: -Relationships between atomic structure and crystalline state (structures of various states, crystal energies, crystal growth, thermodynamic studies, phase transformations, solid solution, exsolution phenomena, etc.) -General solid state spectroscopy (ultraviolet, visible, infrared, Raman, ESCA, luminescence, X-ray, electron paramagnetic resonance, nuclear magnetic resonance, gamma ray resonance, etc.) -Experimental and theoretical analysis of chemical bonding in minerals (application of crystal field, molecular orbital, band theories, etc.) -Physical properties (magnetic, mechanical, electric, optical, thermodynamic, etc.) -Relations between thermal expansion, compressibility, elastic constants, and fundamental properties of atomic structure, particularly as applied to geophysical problems -Electron microscopy in support of physical and chemical studies -Computational methods in the study of the structure and properties of minerals -Mineral surfaces (experimental methods, structure and properties)