Synthesis and Structure of Polymorph B of Zeolite Beta

Corma, Avelino; Moliner, Manuel; Cantı́n, Ángel; Díaz–Cabañas, María J.; Jordá, José L.; Zhang, Daliang; Sun, Junliang; Jansson, Kjell; Hovmöller, Sven; Zou, Xiaodong

doi:10.1021/cm8002244

Cited by 81 publications

(95 citation statements)

References 33 publications

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“…Polymorph D, and E also contain the D4R cages, which are not found in either polymorph A, B, or C H . To date, pure polymorph C22, nearly pure polymorph B23, and the intergrowth zeolite Beta of polymorph B and C H 21 have been synthesized. Intergrown zeolite Beta of D and E has been recently reported, which gave two intense X-ray diffraction peaks at 2θ = 7.0 and 9.7° 24.…”

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confidence: 99%

Synthesis of chiral polymorph A-enriched zeolite Beta with an extremely concentrated fluoride route

Tong

Zhang

Fan

et al. 2015

Sci Rep

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Chiral zeolitic materials with intrinsically chiral frameworks are highly desired because they can combine both shape selectivity and enantioselectivity. In the field of zeolite, the synthesis of chiral polymorph A of zeolite Beta or chiral polymorph A-enriched zeolite Beta is one of the biggest challenges. We demonstrate here a generalized extremely concentrated fluoride route for the synthesis of chiral polymorph A-enriched zeolite Beta in the presence of five achiral organic structure-directing agents. The polymorph A-enriched Ti-Beta shows a higher enantioselectivity for the asymmetric epoxidation of alkenes than the normal Ti-Beta.

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confidence: 99%

Synthesis of chiral polymorph A-enriched zeolite Beta with an extremely concentrated fluoride route

Tong

Zhang

Fan

et al. 2015

Sci Rep

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“…5.2.4. 3D reconstruction has been used to solve the structures of the high-silica zeolite beta polytype C (BEC) [110] and polytype B [111]. It has been recently used to solve the structure of an intergrown zeolite ITQ-39 [40].…”

Section: Structure Determination Of Zeolites By 3d Reconstruction Of mentioning

confidence: 99%

“…It has been recently used to solve the structure of an intergrown zeolite ITQ-39 [40]. Corma and coworkers synthesized a highly enriched form of zeolite beta polytype B [111]. SAED did not show diffuse streaks, as is usual for crystals of zeolite beta.…”

Section: Structure Determination Of Zeolites By 3d Reconstruction Of mentioning

confidence: 99%

Structure Determination of Zeolites by Electron Crystallography

Willhammar¹,

Zou²

2016

Green Chemistry and Sustainable Technology

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Electron crystallography has shown to be an important method for structural characterization of zeolites. Electron crystallography is a method which comprises several important advantages over other characterization methods. With the electron as a probe, single-crystal diffraction data can be obtained from crystals million times smaller than what is possible with X-ray methods today. This is an important advantage especially for zeolites since they are often obtained as very small crystals. Electrons also enable the formation of images of a specimen with the atomic resolution. This is of essential importance when studying materials that are very complex or contain disorder. Over the years electron crystallography has been used for structure determination of zeolites. Through methodological advances during the last few years, it has evolved into an even more powerful method with crucial importance for structure determination. This chapter gives an introduction to electron crystallography and various electron crystallographic methods and their combinations with other methods used for structure determination of zeolite materials. Different routes for structure determination are described through examples from recently reported structure determinations.

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“…Examples are the polytype A enriched beta with 70% polytype A [14], polytype B enriched beta with 85% polytype B [17], and a random intergrowth of polytypes A and C H [13]. Polytype C H is a hypothetical polytype C proposed by Higgins et al [12], an ordered intergrowth of polytypes A and B in which one of the crystallographic projections is equivalent to those in polytype A and another projection is equivalent to those in polytype B.…”

Section: Stacking Disorders In Zeolitesmentioning

confidence: 99%

Stacking disorders in zeolites and open-frameworks – structure elucidation and analysis by electron crystallography and X-ray diffraction

Willhammar¹,

Zou²

2013

Zeitschrift für Kristallographie - Crystalline Materials

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Abstract. Intergrowth and stacking disorders are often found in minerals and synthetic zeolites and inorganic openframeworks. Structure elucidation of stacking disorders in these materials have been difficult and structure solution of stacking disorders in unknown zeolites and open-frameworks has been challenging. There exist no standard methods for structure analysis of such disordered materials. In this review we present various stacking disorders and intergrowth in a number of representative zeolite families containing stacking disorders. These include zeolite beta, SSZ-26/SSZ-33, ITQ-39, ABC-6, ZSM-48, SSZ-31, UTD-1, faujasite FAU/EMT, pentasil ZSM-5/ZSM-11, ITQ-13/ITQ-34, ITQ-22/ITQ-38 etc. Stacking disorders in open-frameworks containing mixed coordinations, including titanosilicates ETS-10 and ETS-4, and the silicogermanate SU-JU-14 are also described. Various crystallographic methods used for solving disordered structures are summarized. The methods include powder X-ray diffraction (PXRD), electron diffraction, high resolution transmission electron microscopy (HRTEM), and single-crystal X-ray diffraction. Examples of model building combined with simulations of PXRD and single crystal X-ray diffraction to verify the structure models are given.

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Synthesis and Structure of Polymorph B of Zeolite Beta

Cited by 81 publications

References 33 publications

Synthesis of chiral polymorph A-enriched zeolite Beta with an extremely concentrated fluoride route

Synthesis of chiral polymorph A-enriched zeolite Beta with an extremely concentrated fluoride route

Structure Determination of Zeolites by Electron Crystallography

Stacking disorders in zeolites and open-frameworks – structure elucidation and analysis by electron crystallography and X-ray diffraction

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