Ionothermal synthesis and characterization of AlPO4 and AlGaPO4 molecular sieves with LTA topology

Liu, Zhangli; Xu, Min; Huai, Xiulan; Huang, Caifeng; Lou, Lanting

doi:10.1016/j.micromeso.2020.110315

Cited by 12 publications

(7 citation statements)

References 53 publications

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“…Besides the considerable interest in ionic liquids due to their diverse properties, such as high ionic conductivity, negligible volatility, non-flammability, and high thermal and chemical stability [31,32], over recent years, ILs have shown new potential as green solvents for chemical reactions [33][34][35] known as 'the ionothermal process'. This has attracted the great interest of many scientific researchers around the world who have contributed to this field [36][37][38][39][40][41][42][43][44][45], including Ahmed and Ruck [46], Wang et al [18], Tian and Liu. [47], Liu and Yu.…”

Section: Historic and Interest In Ionic Liquidsmentioning

confidence: 99%

“…However, investigations have concluded that with approximately the same composition used 1P:1Al: 1TMAOH:1F, increasing the dosage of the ionic liquid from 7 to 100 mol is not necessary for the ionothermal method. The authors compensated with morpholine or DIPA, which acted as the SDA with a low dosage of IL in the reaction mixture [45,86,87]. Moreover, as shown in Figure 5, unlike the hydrothermal method, the ionothermal route allows for the reduction of the cubic crystallite size of LTA-type aluminophosphate molecular sieves from 12 μm [88] to 2 or 3 μm [45,86].…”

Section: Full Name Abbreviation 1-ethyl-3-methylimidazolium Bromide [...mentioning

confidence: 99%

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A review on ionothermal synthesis of zeolites and zeotype materials

Fortas,

Boukoussa,

Hasnaoui

et al. 2024

Phys. Scr.

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Known as green inorganic products and environmentally beneficial, ionic liquids (ILs) are increasingly used in the ionothermal synthesis of zeolites and zeotype materials compared to the hydrothermal method. This safe and successful process offers new opportunities to produce several molecular sieves with different morphologies and structures for promising applications.In this review, we summarize the history of the most successful phases of zeolites and zeotype materials, with different structures such as AEL, AEI, AFI, AST, ATS, CHA, -CLO, ITW, LEV, LTA, MFI, MTN, MTT, SOD, TON, IRR, and STW, from ILs discovery until 2022. The use of the ionothermal method compared to the hydrothermal route is evaluated and reported in this paper, besides synthesis parameters affecting the final product formation, such as IL dosage, cation size and shape, water content, (P, Si, F, IL/Al) ratios, crystallization time and temperature, mineralizing agent, Me/Al ratio, the addition of a secondary template (co-SDA), the use of IL as both SDA and solvent, competition in forming the framework, and the use of eutectic mixture and deep eutectic solvent (DES). Furthermore, we collected the various applications of these materials and highlighted the advantages of the ionothermal process, offering a comprehensive understanding of this topic.

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Section: Historic and Interest In Ionic Liquidsmentioning

confidence: 99%

Section: Full Name Abbreviation 1-ethyl-3-methylimidazolium Bromide [...mentioning

confidence: 99%

A review on ionothermal synthesis of zeolites and zeotype materials

Fortas,

Boukoussa,

Hasnaoui

et al. 2024

Phys. Scr.

View full text Add to dashboard Cite

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“…Numerous efforts have been devoted to prepare new microporous AlPO 4 s with novel properties, including the development of a variety of preparation methods: hydrothermal/solvothermal synthesis, , dry gel conversion, solvent-free synthesis, ionothermal synthesis, and so on. As a newer preparation method, ionothermal synthesis of microporous AlPO 4 s has attracted much attention since earlier work was published in 2004. − The solvent used in ionothermal synthesis, the so-called ionic liquid, is a salt with a melting point less than 100 °C. , Distinct from molecular solvents such as water, ionic liquids consist of predominantly ionic species and exhibit many promising solvent properties including high polarity and negligible vapor pressure. The high polarity makes many inorganic precursors soluble, and the negligible vapor pressure avoids the use of high-pressure reaction vessels in the synthesis .…”

Section: Introductionmentioning

confidence: 99%

Ultrafast Crystallization of AlPO₄-5 Molecular Sieve in a Deep Eutectic Solvent

Liu

Huang

2021

J. Phys. Chem. C

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In the present work, ultrafast crystallization of AlPO 4 -5 molecular sieve was observed in a deep eutectic solvent (DES) composed of tetraethylammonium chloride (TEACl) and pentaerythritol (PE). Under conventional heating, the formation of AlPO 4 -5 can be as fast as a few minutes in the presence of F − at a reaction temperature as low as 150 °C. In the absence of F − , the nucleation of AlPO 4 -5 is delayed by approximately 30 min. Various characterization tools such as powder X-ray diffraction and ex situ or in situ multinuclear ( 1 H, 19 F, 14 N, 27 Al, 31 P, and 35 Cl) NMR were used to extract information on the structure of frozen DES, AlPO 4 -5 products, and solid and liquid phases of the reaction mixtures as a function of reaction time.Frozen DES is in a plastic phase at room temperature. An amorphous AlPOF phase appears to be an intermediate. Crystallization of AlPO 4 -5 without fluoride is also fast, but the nucleation is delayed by 30 min. The AlPO 4 -5 prepared in DES without fluoride has a crystal symmetry of P6cc, whereas crystallization in a fluoride medium produces AlPO 4 -5 with a lower crystal symmetry of Ccc2. This work demonstrates that in DES (TEACl and PE) AlPO 4 -based molecular sieves can be prepared within a very short time and at lower temperature and that the crystal symmetry of AlPO 4 -based molecular sieves can be controlled by addition of fluoride in this DES. The results also provide information that will assist researchers to gain a better understanding of how molecular sieves are formed in DES under ionothermal conditions.

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“…Finally, several phosphate‐based zeotypes with d4r cages have been synthesised in fluoride‐containing media, among them the extra‐large pore gallophosphate (GaPO) cloverite (−CLO) [35] and LTA‐type aluminophosphates (AlPOs) [36,37] . While practical applications of cloverite are severely limited due to its low stability, [38] AlPO 4 ‐LTA has been employed in membrane‐based separations [39] and in thermal energy storage [40,41] …”

Section: Introductionmentioning

confidence: 99%

Local Distortions in a Prototypical Zeolite Framework Containing Double Four‐Ring Cages: The Role of Framework Composition and Organic Guests**

Fischer

Freymann

2020

ChemPhysChem

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Cube‐like double four‐ring ( d4r ) cages are among the most frequent building units of zeolites and zeotypes. In materials synthesised in fluoride‐containing media, the fluoride anions are preferentially incorporated in these cages. In order to study the impact of framework composition and organic structure‐directing agents (OSDAs) on the possible occurrence of local distortions of fluoride‐containing d4r cages, density functional theory (DFT) calculations and DFT‐based molecular dynamics simulations were performed for AST‐type zeotypes, considering four different compositions (SiO 2 , GeO 2 , AlPO 4 , GaPO 4 ) and two different OSDA cations (tetramethylammonium [TMA] and quinuclidinium [QNU]). All systems except SiO 2 ‐AST show significant deformations, with a pyritohedron‐like distortion of the d4r cages occurring in GeO 2 ‐ and GaPO 4 ‐AST, and a displacement of the fluoride anions towards one of the corners of the cage in AlPO 4 ‐ and GaPO 4 ‐AST. While the distortions occur at random in TMA‐containing zeotypes, they exhibit a preferential orientation in systems that incorporate QNU cations. In addition to providing detailed understanding of the local structure of a complex host‐guest system on the picosecond timescale, this work indicates the possibility to stabilise ordered distortions through a judicious choice of the OSDA, which might enable a tuning of the material's properties.

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Ionothermal synthesis and characterization of AlPO4 and AlGaPO4 molecular sieves with LTA topology

Cited by 12 publications

References 53 publications

A review on ionothermal synthesis of zeolites and zeotype materials

A review on ionothermal synthesis of zeolites and zeotype materials

Ultrafast Crystallization of AlPO₄-5 Molecular Sieve in a Deep Eutectic Solvent

Local Distortions in a Prototypical Zeolite Framework Containing Double Four‐Ring Cages: The Role of Framework Composition and Organic Guests**

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Ionothermal synthesis and characterization of AlPO4 and AlGaPO4 molecular sieves with LTA topology

Cited by 12 publications

References 53 publications

A review on ionothermal synthesis of zeolites and zeotype materials

A review on ionothermal synthesis of zeolites and zeotype materials

Ultrafast Crystallization of AlPO4-5 Molecular Sieve in a Deep Eutectic Solvent

Local Distortions in a Prototypical Zeolite Framework Containing Double Four‐Ring Cages: The Role of Framework Composition and Organic Guests**

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Ultrafast Crystallization of AlPO₄-5 Molecular Sieve in a Deep Eutectic Solvent