Synthesis and structure analysis of zeolite AS-1 from HF–Al2O3–SiO2–ethylenediamine–H2O

Dong, Jinxiang; Wang, Ying X.; Xu, Hong; Deng, Feng; Xu, Jun; Wang, Jian G.

doi:10.1016/j.micromeso.2008.05.021

Cited by 6 publications

(3 citation statements)

References 14 publications

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“…There have been strenuous efforts to discover new compositions and architectures particularly after the successful synthesis of microporous aluminoshosphates in 1982 and researchers have reported aluminophosphates, zincophosphates, iron phosphates and many other bimetallic phosphates in the field framework studies 34 , 35 . Thus, the incorporation of active metals into open-framework structures has given rise to many new structures analogous to zeolite topologies 36 . Zeolite DFT and BCT are two versatile framework topologies that arouse great interest among researchers due to their structural simillarities and tremendous potential to generate various types of novel frameworks.…”

Section: Zeolites Bct and Dftmentioning

confidence: 99%

“…The adjustment of nodes in a four-ring can give various patterns of nets, which is common in the structures analogous to the DFT framework. DFT topology provides an interesting domain to explore the relationship between silicates and phosphates related framework topologies 36 , 37 . Zeolite BCT (body-centered tetragonal tectosilicate) framework is related to other tectosilicate.…”

Section: Zeolites Bct and Dftmentioning

confidence: 99%

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Entropy structural characterization of zeolites BCT and DFT with bond-wise scaled comparison

Arockiaraj¹,

Paul²,

Ghani

et al. 2023

Sci Rep

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Entropy of a connected network is a quantitative measure from information theory that has triggered a plethora of research domains in molecular chemistry, biological sciences and computer programming due to its inherent capacity to explore the structural characteristics of complex molecular frameworks that have low structural symmetry as well as high diversity. The analysis of the structural order is greatly simplified through the topological indices based graph entropy metrics, which are then utilized to predict the structural features of molecular frameworks. This predictability has not only revolutionized the study of zeolitic frameworks but has also given rise to new generations of frameworks. We make a comparative study of two versatile framework topologies namely zeolites BCT and DFT, which have been widely utilized to create a new generation of frameworks known as metal organic frameworks. We discuss bond-additive topological indices and compute entropy measure descriptors for zeolites BCT and DFT using degree and degree-sum parameters. In addition, we perform bond-wise scaled comparative analysis between BCT and DFT which shows that zeolite BCT has greater entropy values compared to zeolite DFT.

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Section: Zeolites Bct and Dftmentioning

confidence: 99%

Section: Zeolites Bct and Dftmentioning

confidence: 99%

Entropy structural characterization of zeolites BCT and DFT with bond-wise scaled comparison

Arockiaraj¹,

Paul²,

Ghani

et al. 2023

Sci Rep

View full text Add to dashboard Cite

show abstract

“…The open-framework zincoarsenates and zincophosphates are of considerable interest for catalysis, as adsorbents and are promising materials for a wide variety of other applications as a result of their microporous structure, good thermal and acid stability [1].…”

Section: Introductionmentioning

confidence: 99%

Four organo-templated structures with DFT-zeotype topology: Variation in symmetry of similar microporous structures

Karanović

Kovač

Poleti

et al. 2016

Microporous and Mesoporous Materials

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Four novel microporous compounds H2(C2H8N2)(ZnAsO4)2 (1), H2(C2H8N2)(Co0.1Zn0.9AsO4)2 (2), H1.8(C2H8N2)(Fe0.1Zn0.9AsO4)2 (3) and H2(C2H8N2)(ZnPO4)2 (4) containing ethylenediammonium cation, H2(C2H8N2)2+ (H2en2+), and ethylenediamine molecule, C2H8N2 (en), have been hydrothermally synthesized. While 1-3 exhibit twinned DFT-zeotype structure and crystallize in P42/n, the 4 is characterized by the appearance of new orthorhombic space group Pcca, previously not observed among the known DFT-zeotype compounds. The symmetry relationships analyses revealed the extended Bärnighausen tree. The main feature of the cobalt blue and reddish brown compounds 2 and 3 is their novel chemical composition which was confirmed by SEM/EDX analysis. In the structure of 1, H-atoms positions, previously not reported, were calculated and refined to reasonable positions using riding model. The DFT anionic frameworks of 1-4 are characterized by 4M, 6M and 8M tetrahedral rings, which produce three mutually perpendicular 8M ring channels. At the intersections of these channels H2en2+ cations are accommodated and hydrogen-bonded to the adjacent oxygen atoms of the framework. Only in 3, H2en2+ is partly substituted by electroneutral en to maintain charge compensation. The singlecrystal Raman spectra and Fourier transform infrared (FTIR) absorption spectra were interpreted on the basis of characteristic vibrations of AsO4 and PO4 groups, as well as of NH3, NH2 and CH2 groups from the H2en2+ cation or en molecule. The results of lattice distortion and similarity analyses showed that the DFT-zeotype structures, which incorporate larger tetrahedral cations, have a higher degree of lattice distortion and are less similar to the ideal structural models derived from the aristotype.

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The Fluoride Route: A Good Opportunity for the Preparation of 2D and 3D Inorganic Microporous Frameworks

Paillaud

Caullet

Brendlé

et al. 2010

Functionalized Inorganic Fluorides

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Synthesis and structure analysis of zeolite AS-1 from HF–Al2O3–SiO2–ethylenediamine–H2O

Cited by 6 publications

References 14 publications

Entropy structural characterization of zeolites BCT and DFT with bond-wise scaled comparison

Entropy structural characterization of zeolites BCT and DFT with bond-wise scaled comparison

Four organo-templated structures with DFT-zeotype topology: Variation in symmetry of similar microporous structures

The Fluoride Route: A Good Opportunity for the Preparation of 2D and 3D Inorganic Microporous Frameworks

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