Abstract
This study investigates the effects of the degree of ion exchange of sodium cations for cesium cations in FAU(Y) on its physicochemical properties. Using aqueous and solid-state ion exchange, a number of NaY samples with an exchange degree of sodium cations for cesium cations varying from 29 to 89% were prepared. The samples were examined by SEM, X-ray fluorescence, low-temperature nitrogen adsorption, XRD, NH3-TPD, IR spectroscopy of adsorbed chloroform, and 27Al MAS NMR. It was demonstrated that samples with exchange degrees up to 87% can be synthesized with their crystalline structure intact. The test of the catalytic properties of the synthesized samples in aniline alkylation with methanol showed a growth in the selectivity for N-alkylated products as the number and strength of basic sites were progressively increased. Impregnating the Cs-containing zeolites with CsOH was found to significantly enhance the operating stability of the samples and the yield of N-alkylated products, compared to CsNaY. The CsOH-modified catalysts with a Na+/Cs+ exchange degree of 54–77% proved to be the most active and stable in aniline alkylation with methanol: they provided aniline conversion of 81–88% and selectivity for N-alkylation products as high as 99.6–99.7 mol %.
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Funding
The NMR examination of the samples was performed with financial support from the Russian Science Foundation (RSF Grant no. 20-13-00203). The synthesis of the samples and the investigation of their physicochemical and catalytic properties were carried out within the State Program “Physical chemistry of surface adsorption and catalysis.”
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I.I. Ivanova, a co-author, is the Chief Editor at the Sovremennye molekulyarnye sita (Advanced Molecular Sieves) Journal. The other co-authors declare no conflict of interest requiring disclosure in this article.
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Ponomareva, O.A., Shaposhnik, P.A., Nazarova, V.I. et al. Effects of Ion Exchange Degree on the Physicochemical and Catalytic Properties of CsNaY. Pet. Chem. 62, 301–309 (2022). https://doi.org/10.1134/S0965544122010042
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DOI: https://doi.org/10.1134/S0965544122010042