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Solvent-Free Synthesis of Mg-Incorporated Nanocrystalline SAPO-34 Zeolites via Natural Clay for Chloromethane-to-Olefin Conversion
journal contribution
posted on 2020-03-05, 20:11 authored by Ting Wang, Chengguang Yang, Shenggang Li, Gan Yu, Ziyu Liu, Hui Wang, Peng Gao, Yuhan SunIsomorphous
substitution is an important approach in modifying
the acidity and pore structure of nanoscale SAPO-34 zeolites, which
can bring about active sites stemming from heteroatoms. However, it
remains a major challenge to use conventional hydrothermal methods
to synthesize cost-effective, all-framework heteroatoms, and environmentally
friendly catalysts. Herein, an efficient and eco-friendly approach
is developed for the solvent-free synthesis of Mg-incorporated SAPO-34
(MgAPSO-34) with Mg content of up to 6.65% and smaller crystal size
(50 nm) by taking advantage of a natural layered Mg-rich aluminosilicate
clay mineral. Characterizations with X-ray diffraction, magic-angle
spinning NMR, and ultraviolet–visible spectroscopies show that
all the Mg can enter the zeolitic framework by replacing the Al sites.
In addition, MgAPSO-34 with the incorporation of a proper amount of
Mg exhibits a high specific surface area and moderate acidity and
thus shows excellent performance and anticoke capacity in the chloromethane-to-olefin
reaction. The combination of “green” synthesis and “superior”
catalytic properties allows for low-cost and environmentally friendly
synthesis of isomorphous substituted SAPO-34 zeolites with high crystallinity
and high quality.
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Keywords
surface areaMg contenthydrothermal methodszeolitic frameworkMgAPSO -34anticoke capacitySAPO -34 zeolitesX-ray diffractionMg-Incorporated Nanocrystalline SAPO -34 ZeolitesChloromethane-to-Olefin Conversion Isomorphous substitutionMg exhibitspore structureeco-friendly approachnanoscale SAPO -34 zeolitesAl sitessolvent-free synthesisNMRNatural Clayall-framework heteroatomsSolvent-Free SynthesisMg-rich aluminosilicate clay mineralacidityMg-incorporated SAPO -34chloromethane-to-olefin reaction
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