Consecutive interlayer disassembly–reassembly during alumination of UOV zeolites: insight into the mechanism

Kasneryk, Valeryia; Opanasenko, Maksym; Shamzhy, Mariya; Musilová, Zuzana; Avadhut, Yamini S.; Hartmann, Martin; Čejka, Jiřı́

doi:10.1039/c7ta05935c

Cited by 21 publications

(18 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This is nicely documented for a series of germanosilicates, originally started with a UTL zeolite followed by UOV and SAZ-1. 31,[223][224][225] Introduction of Ge allowed synthesizing a number of new zeolites with large or extra-large pores. Simultaneously, it resulted in the formation of relatively labile Ge-O bonds.…”

Section: Adormentioning

confidence: 99%

From 3D to 2D zeolite catalytic materials

et al. 2018

View full text Add to dashboard Cite

Research activities and recent developments in the area of three-dimensional zeolites and their two-dimensional analogues are reviewed. Zeolites are the most important industrial heterogeneous catalysts with numerous applications. However, they suffer from limited pore sizes not allowing penetration of sterically demanding molecules to their channel systems and to active sites. We briefly highlight here the synthesis, properties and catalytic potential of three-dimensional zeolites followed by a discussion of hierarchical zeolites combining micro- and mesoporosity. The final part is devoted to two-dimensional analogues developed recently. Novel bottom-up and top-down synthetic approaches for two-dimensional zeolites, their properties, and catalytic performances are thoroughly discussed in this review.

show abstract

Section: Adormentioning

confidence: 99%

From 3D to 2D zeolite catalytic materials

et al. 2018

View full text Add to dashboard Cite

show abstract

“…Depending on the actual 2q value, conclusions about the nature of the linkages are possible. 22 Zeolites with frameworks IWR, 24 IWW, 25,26 UOV, 27,28 and *CTH 29 exhibit similar structural features as UTL in that they contain d4r units, and have been successfully used in the ADOR process to produce a variety of new frameworks. There are still more frameworks to explore, such as zeolite IWV, 30,31 which also contain the necessary structural features required for ADOR.…”

Section: Germanosilicate Zeolites and The Ador Processmentioning

confidence: 99%

Mechanochemically assisted hydrolysis in the ADOR process

et al. 2020

View full text Add to dashboard Cite

show abstract

“…17 There are several known zeolite topologies that have the features necessary for successful application in the ADOR process. These include UTL, 3,6,7 ITH, 19 ITR, 19 IWR, 19 IWW, 20 UOV 21,22 and the recently discovered SAZ-1 23 (note that a description of how the nomenclature of zeolites is derived is found below). There are several characterisation techniques that have been used to probe the ADOR mechanism and the daughter zeolites produced, including powder X-ray diffraction (PXRD) and the subsequent Rietveld refinement, 24,25 in situ and ex situ Pair Distribution Function (PDF) analysis, 24,26 solid-state NMR spectroscopy 25,27 and high resolution electron microscopy.…”

Section: Controllability and Predictability Of Productsmentioning

confidence: 99%

A procedure for identifying possible products in the assembly–disassembly–organization–reassembly (ADOR) synthesis of zeolites

et al. 2019

Self Cite

View full text Add to dashboard Cite

High silica zeolites are some of the most important and widely used catalysts in modern industry, and they have potential for application across a wide range of traditional and emerging technologies. The many different structural topologies available to zeolites open up many different potential uses so there is still a strong drive to prepare new zeolites. Here we present a protocol for a relatively new method of preparing these important solids called the Assembly-Disassembly-Organization-Reassembly (ADOR) process. It allows for the synthesis of new high silica zeolites that are thought to be unfeasible through traditional methods, opening up new topologies that may find new industrial applications. A procedure for identifying the optimum conditions (time of reaction, temperature, acidity etc.) for the ADOR process has been developed. The ADOR method is a complex process with different possible outcomes. Following the protocol will allow researchers to identify the different products that are possible from the reaction without recourse to repetitive and time-consuming trial and error. In developing the protocol, germanium-containing UTL zeolites were subjected to hydrolysis conditions using both water and hydrochloric acid as media, which provides an understanding of the effects of temperature and pH on the Disassembly (D) and Organization (O) steps of the process that define the potential products. Samples were taken from the ongoing reaction periodically over a minimum time of 8 hr and each sample was analysed by powder X-ray diffraction to yield a time course for the reaction at each set of conditions, with selected samples analysed by transmission electron microscopy and solid-state NMR spectroscopy. Diversity of products Synthesised zeolite may be limited by the reversible nature of crystallisation step *No inherent limitation on the types of products possible Chemical composition *Zeolites can be prepared using a wide variety composition of reaction mixture So far limited to the germanosilicates as parent materials Price Often (but not always) needs expensive organic structure directing agents Use of expensive germanium in parent materials

show abstract

Consecutive interlayer disassembly–reassembly during alumination of UOV zeolites: insight into the mechanism

Abstract: Investigation of the kinetics of UOV germanosilicate alumination by X-ray diffraction, 27Al and 29Si MAS NMR, ICP/OES and FTIR spectroscopy showed the multi-stage mechanism of the process.

Cited by 21 publications

References 41 publications

From 3D to 2D zeolite catalytic materials

From 3D to 2D zeolite catalytic materials

Mechanochemically assisted hydrolysis in the ADOR process

A procedure for identifying possible products in the assembly–disassembly–organization–reassembly (ADOR) synthesis of zeolites

Contact Info

Product

Resources

About