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On understanding the sequential post-synthetic microwave-assisted dealumination and alkaline treatment of Y zeolite

DOI: 10.1016/j.micromeso.2022.111736 DOI Help

Authors: Rongxin Zhang (SINOPEC; The University of Manchester) , Run Zou (The University of Manchester) , Wei Li (The University of Manchester) , Yabin Chang (The University of Manchester) , Xiaolei Fan (The University of Manchester)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Microporous And Mesoporous Materials , VOL 270

State: Published (Approved)
Published: February 2022
Diamond Proposal Number(s): 22476

Abstract: Systematic investigation was performed to understand the change of physiochemical properties in Y zeolite after the microwave (MW)-assisted dealumination (using mineral acid, HCl, and chelating agent, EDTA4−) and the subsequent alkaline treatment (of the dealuminated zeolites). The findings show that the combination of EDTA4− and hydrogen ions was effective to achieve dealumination of zeolite Y under MW irradiation, which formed complexed framework Al, instead of extra-framework Al (EFAl), to be extracted readily by the sequential alkaline treatment for mesopore formation. Conversely, under the same MW condition, the use of HCl encouraged the formation of EFAl species in the defective Y framework, which did not benefit the mesopore formation. The disclose of the distinct dealumination mechanisms of the MW-assisted method using different agents can benefit the further development of effective MW methods for dealumination of zeolites and/or making mesoporous zeolites.

Journal Keywords: Y zeolite; Post-synthetic treatment; Dealumination; Microwave (MW); NMR

Subject Areas: Materials, Chemistry


Instruments: B22-Multimode InfraRed imaging And Microspectroscopy

Added On: 09/02/2022 08:57

Discipline Tags:

Zeolites Physical Chemistry Catalysis Chemistry Materials Science

Technical Tags:

Spectroscopy Infrared Spectroscopy Synchtron-based Fourier Transform Infrared Spectroscopy (SR-FTIR)