Abstract
Crystallization of molecular sieves SAPO-41 from gels containing layered 2D silicoaluminophosphates with various SiO2/Al2O3 molar ratios (from 0.1 to 0.3) was studied using X-ray photoelectron spectroscopy (XPS), X-ray fluorescence analysis (XRF), Raman spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), N2 adsorption–desorption, and IR spectroscopy with pyridine adsorption. The effect of the presence of layered phases in gels on the chemical and phase compositions, acid properties, and porous structure characteristics of their crystallization products was established. A procedure for the synthesis of SAPO-41 of high phase purity and degree of crystallinity was proposed. The catalytic properties of Pt-containing catalytic systems prepared on the basis of the obtained molecular sieves in the hydroisomerization of n-hexadecane were studied.
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This study was supported by the Russian Science Foundation (grant no. 21-73-00013), https://rscf.ru/project/21-73-00013/.
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Translated by V. Makhlyarchuk
Abbreviations and notation: SAPO-n, silicoaluminophosphate molecular sieves; XPS, X-ray photoelectron spectroscopy; XRF, X-ray fluorescence analysis; SEM, scanning electron microscopy; TEM, transmission electron microscopy; BAS, Brønsted acid site; LAS, Lewis acid site; MTO, synthesis of lower olefins from methanol (methanol to olefins); SDA, secondary amine; DPA, di-n-propylamine; SBU, secondary building unit; SBET, Brunauer–Emmett–Teller specific surface area; Vmicro, micropore volume; Vmeso, mesopore volume.
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Agliullin, M.R., Serebrennikov, D.V., Khalilov, L.M. et al. Study of the Properties of Molecular Sieves Produced from Gels Containing Layered 2D Silicoaluminophosphates with Different SiO2/Al2O3 Ratios. Kinet Catal 64, 311–319 (2023). https://doi.org/10.1134/S0023158423030011
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DOI: https://doi.org/10.1134/S0023158423030011