The search for new zeolites is of continuous interest in the field of zeolite science because of their widespread application in catalysis and adsorption–separation. To this end, considerable efforts have been devoted to the preparation of new zeolites with novel porous architectures and compositions. Taking account of the key factors governing the formation of zeolites (e.g., guest species, framework elements, construction processes, etc.), several synthetic strategies have been developed recently. These allow the discovery of many new zeolites with unprecedented structural features, such as hierarchical pores, odd-ring numbers (11-, 15-rings), extra-large pores (16-, 18-, 20-, 28-, and 30-rings), chiral pores, and extremely complex framework topologies, etc. In this review, we will present the advances in the synthesis of new zeolite structures in the last decade, which are achieved by utilization of the synthetic strategies based on pre-designed structure-directing agents, heteroatom substitution, and topotactic transformations.

/pdf/synthesis-of-new-zeolite-structures-2ko332k5bn.pdf

Synthesis of new zeolite structures

A novel methodology, called ADOR (assembly–disassembly–organisation–reassembly), for the synthesis of zeolites is reviewed here in detail. The ADOR mechanism stems from the fact that certain chemical weakness against a stimulus may be present in a zeolite framework, which can then be utilized for the preparation of new solids through successive manipulation of the material. In this review, we discuss the critical factors of germanosilicate zeolites required for application of the ADOR protocol and describe the mechanism of hydrolysis, organisation and condensation to form new zeolites starting from zeolite UTL. Last but not least, we discuss the potential of this methodology to form other zeolites and the prospects for future investigations.

/pdf/the-ador-mechanism-for-the-synthesis-of-new-zeolites-26m6tayfm3.pdf

The ADOR Mechanism for the Synthesis of New Zeolites

A review on sustainable synthesis of zeolite from kaolinite resources via hydrothermal process

The prediction and synthesis of new crystal structures enable the targeted preparation of materials with desired properties. Among porous solids, this has been achieved for metal-organic frameworks ...

/pdf/a-zeolite-family-with-expanding-structural-complexity-and-35nu2rn7ky.pdf

A zeolite family with expanding structural complexity and embedded isoreticular structures

We report herein the first example of interpenetration isomerism in covalent organic frameworks (COFs). As a well-known three-dimensional (3D) COF, COF-300 was synthesized and characterized by the Yaghi group in 2009 as a 5-fold interpenetrated diamond structure (dia-c5 topology). We found that adding an aging process prior to the reported synthetic procedure afforded the formation of an interpenetration isomer, dia-c7 COF-300. The 7-fold interpenetrated diamond structure of this new isomer was identified by powder X-ray diffraction and rotation electron diffraction analyses. Furthermore, we proposed a universal formula to accurately determine the number of interpenetration degrees of dia-based COFs from only the unit cell parameters and the length of the organic linker. This work not only provides a novel example to the category of interpenetration isomerism but also provides new insights for the further development of 3D COFs.

Observation of Interpenetration Isomerism in Covalent Organic Frameworks

Zeolites have been widely used in industry owing to their ordered micropores and stable frameworks. The pore sizes and shapes are the key parameters that affect the selectivity and efficiency in th ...

A Germanosilicate Structure with 11×11×12-Ring Channels Solved by Electron Crystallography†

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A Germanosilicate Structure with 11×11×12-Ring Channels Solved by Electron Crystallography†