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Synthesis of SAPO-34 nanoplates with high Si/Al ratio and improved acid site density

Alam, Syed Fakhar, Kim, Min-Zy, Rehman, Aafaq ur, Arepalli, Devipriyanka, Sharma, Pankaj and Cho, Churl Hee 2021. Synthesis of SAPO-34 nanoplates with high Si/Al ratio and improved acid site density. Nanomaterials 11 (12) , 3198. 10.3390/nano11123198

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Abstract

Two-dimensional SAPO-34 molecular sieves were synthesized by microwave hydrothermal process. The concentrations of structure directing agent (SDA), phosphoric acid, and silicon in the gel solution were varied and their effect on phase, shape, and composition of synthesized particles was studied. The synthesized particles were characterized by various techniques using SEM, XRD, BET, EDX, and NH3-TPD. Various morphologies of particles including isotropic, hyper rectangle, and nanoplates were obtained. It was found that the Si/Al ratio of the SAPO-34 particles was in a direct relationship with the density of acid sites. Moreover, the gel composition and preparation affected the chemistry of the synthesized particles. The slow addition of phosphoric acid improved the homogeneity of synthesis gel and resulted in SAPO-34 nanoplates with high density of acid sites, 3.482 mmol/g. The SAPO-34 nanoplates are expected to serve as a high performance catalyst due to the low mass transfer resistance and the high density of active sites.

Item Type: Article
Date Type: Published Online
Status: Published
Schools: Chemistry
Additional Information: This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
Publisher: MDPI
ISSN: 2079-4991
Funders: Research Fund of Chungnam National University
Date of First Compliant Deposit: 16 December 2021
Date of Acceptance: 19 November 2021
Last Modified: 17 Dec 2021 16:00
URI: https://orca.cardiff.ac.uk/id/eprint/146193

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