Influence of synthesis parameters on NaA zeolite crystals

Liu, Xing-dong; Wang, Yipin; Cui, Xuemin; He, Yan; Mao, Jin

doi:10.1016/j.powtec.2013.03.048

Cited by 95 publications

(52 citation statements)

References 26 publications

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“…This is because the sodalite has more stable structure than zeolite Na-X. Note that the zeolites can be divided into seven groups where each group unites the zeolites with the same connections between TO 4 (T refer to Al or Si) tetrahedral 14,[17][18][19][20] . The primary structural units are the SiO 4 and AlO 4 tetrahedra, while these condary units are combined from these tetrahedral.…”

Section: The Effect Of Hydrothermal Timementioning

confidence: 99%

“…In the single-step hydrothermal processing, crystal variety in the end zeolite products became the major drawbacks of this method [11][12][13] . In the twostep hydrothermal processing, only the liquid alkali extracts from y ash were used in the production of the zeolite, which leaves behind yet another solid waste product and gives a very low production yield [14][15][16] . Previously, only one type of pure zeolite was utilized in the investigation and it is not clear whether the same methodology was suitable to synthesize two different kinds of pure zeolites from the same raw material.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of Pure Na–X and Na–P Zeolite from Acid-Extracting Residues of CFB Fly Ash by a Single-Step Hydrothermal Method

et al. 2016

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Acid-extracting residue of circulating uidized bed (CFB) y ash is still underutilized leaving disposal problems. In fact, high silica content inside this material opens a possibility to become a potential zeolites precursor. In this study, ne particles of acid residues have been reused to prepare zeolite Na-X and Na-P with high purity and intensity. Acid residue was used to synthesize zeolite Na-X and Na-P using a single-step hydrothermal process. The effects of crystallization time, temperature and sodium hydroxide concentration on the end products were investigated. The results revealed that crystallization time and temperature determined whether or not zeolite Na-X or Na-P was formed. The zeolites were characterized in terms of their mineralogical composition, morphology, and fourier-transform infrared spectroscopy.

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Section: The Effect Of Hydrothermal Timementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synthesis of Pure Na–X and Na–P Zeolite from Acid-Extracting Residues of CFB Fly Ash by a Single-Step Hydrothermal Method

et al. 2016

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“…Liu, X. et al (2013) 15 , by using tetraethyl orthosilicate with aluminum chloride as a source of aluminum, noted that a decrease in the H 2 O/Na 2 O ratio led to the formation of a zeolite NaA and NaX mixture, but when this ratio was increased from 20 to 30 or 40, only the pure NaA phase was obtained. In our study, the pure zeolite A phase was synthesized by using a NaOH/metakaolin ratio of 0.5 and a H 2 O/Na 2 O ratio of 96.…”

Section: = / /mentioning

confidence: 99%

Study on the NaOH/metakaolin Ratio and Crystallization Time for Zeolite a Synthesis from Kaolin Using Statistical Design

et al. 2017

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The NaOH/metakaolin ratio and crystallization time were studied for the synthesis of zeolite NaA from a sample of kaolin from a Capim mine. The tests were carried out by using statistical design with axial points and replication of the central point. The samples obtained were characterized by X-ray diffraction (DRX), scanning electron microscopy and chemical analysis using a microprobe EPMA. The results showed that there is a relationship between the amount of NaOH added and crystallization time. The tests carried out using the lowest NaOH/metakaolin ratio (0.5) and the shortest time (4 h) produced a non-crystalline material. On the other hand, increasing the NaOH/metakaolin ratio and the crystallization time led to the formation of a NaA phase with a high structural level, but with the presence of a sodalite phase as an impurity.

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“…These crystalline materials may be produced naturally or synthesized in laboratory [8][9][10][11]. In order to synthesize a specific type of zeolite, appropriate ingredients should be used, their ratio in the reaction mixture should be accurately adjusted, and special attention should be given to the temperature and crystallization time [12].…”

Section: Introductionmentioning

confidence: 99%

“…Large number of experimental data on synthesis of the Linde Type A (LTA) zeolite [10,12,[20][21][22][23], and importance of simulation of its theoretical behavior motivated us to study this route from different points of view. Therefore, a focus of the present research is concentrated on designing an intelligent tool to study the effect of the most influential synthesis parameters on the relative crystallinity of the LTA zeolites.…”

Section: Introductionmentioning

confidence: 99%

Prediction of degree of crystallinity for the LTA zeolite using artificial neural networks

Ghanbari

Vaferi

2017

Materials Science-Poland

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Zeolites are microporous aluminosilicate/silicate crystalline materials with three-dimensional tetrahedral configuration. In this study, the degree of crystallinity of the synthesized Linde Type A (LTA) zeolite, which is the main indicator of its quality/purity is tried to be modeled. Effect of crystallization time, temperature, molar ratio of the synthesis gel on the relative crystallinity of the LTA zeolites is investigated using artificial neural networks. Our experimental observations and some data collected from literature have been used for adjusting the parameters of the proposed model and evaluating its performance. It has been observed that two-layer perceptron network with eight hidden neurons is the most accurate approach for the considered task. The designed model predicts the experimental datasets with a mean square error of 3.99 × 10 −6 , absolute average relative deviation of 8.69 %, and regression coefficient of 0.9596. The proposed model can decrease the required time and number of experiments to evaluate the extent of crystallinity of the LTA zeolites.

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Influence of synthesis parameters on NaA zeolite crystals

Cited by 95 publications

References 26 publications

Synthesis of Pure Na–X and Na–P Zeolite from Acid-Extracting Residues of CFB Fly Ash by a Single-Step Hydrothermal Method

Synthesis of Pure Na–X and Na–P Zeolite from Acid-Extracting Residues of CFB Fly Ash by a Single-Step Hydrothermal Method

Study on the NaOH/metakaolin Ratio and Crystallization Time for Zeolite a Synthesis from Kaolin Using Statistical Design

Prediction of degree of crystallinity for the LTA zeolite using artificial neural networks

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