Rational Manipulation of Stacking Arrangements in Three‐Dimensional Zeolites Built from Two‐Dimensional Zeolitic Nanosheets. (31st August 2020)

• Record Type: Journal Article
• Authors: Xu, Le; Ma, Tianqiong; Shen, Yihan; Wang, Yong; Han, Lu; Chaikittisilp, Watcharop; Yokoi, Toshiyuki; Sun, Junliang; Wakihara, Toru; Okubo, Tatsuya
• Is Part Of: Angewandte Chemie. Volume 132:Number 45(2020)
• Page Start: 20106
• Page End: 20111
• Publication Date: 2020-08-31
• Subjects: catalysis -- crystal growth -- layered compounds -- structure transformations; Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.202009336
• Languages: English
• ISSNs: 0044-8249

Abstract

Abstract: Unit‐cell‐thin zeolitic nanosheets have emerged as fascinating materials for catalysis and separation. The controllability of nanosheet stacking is extremely challenging in the chemistry of two‐dimensional zeolitic materials. To date, the organization of zeolitic nanosheets in hydrothermal synthesis has been limited by the lack of tunable control over the guest–host interactions between organic structure‐directing agents (OSDAs) and zeolitic nanosheets. A direct synthetic methodology is reported that enables systematic manipulation of the aluminosilicate MWW‐type nanosheet stacking. Variable control of guest–host interactions is rationally achieved by synergistically altering the charge density of OSDAs and synthetic silica‐to‐alumina composition. These finely controlled interactions allow successful preparation of a series of three‐dimensional (3D) zeolites, with MWW‐layer stacking in wide ranges from variably disorder to fully ordered, leading to tunable catalytic activity in the cracking reaction. These results highlight unprecedented opportunities to modulate zeolitic nanosheets arrangement in 3D zeolites whose structure can be tailored for catalysis and separation. Abstract : A synthetic method has been developed to realize systematic manipulation of two‐dimensional zeolitic nanosheets stacked in a 3D zeolite. The strategy opens up possibilities in the design of zeolitic nanosheet arrangements whose structure can be tailored for applications in catalysis and separation.