A1 Refereed original research article in a scientific journal
Synthesis and physico-chemical characterization of Beta zeolite catalysts: Evaluation of catalytic properties in Prins cyclization of (-)-isopulegol
Authors: Zaykovskaya AO, Kumar N, Kholkina EA, Li-Zhulanov NS, Mäki-Arvela P, Aho A, Peltonen J, Peurla M, Heinmaa I, Kusema BT, Streiff S, Murzin DY
Publisher: ELSEVIER
Publication year: 2020
Journal: Microporous and Mesoporous Materials
Journal name in source: MICROPOROUS AND MESOPOROUS MATERIALS
Journal acronym: MICROPOR MESOPOR MAT
Article number: ARTN 110236
Volume: 302
Number of pages: 13
ISSN: 1387-1811
eISSN: 1873-3093
DOI: https://doi.org/10.1016/j.micromeso.2020.110236
Abstract
Synthesis of Beta zeolite catalysts was carried out using two different methods. The influence of such parameters as synthesis time and temperature, gel composition and gel ripening on the physico-chemical and catalytic properties of Beta zeolite catalysts was studied. A range of analytical methods was applied in this work including scanning and transmission electron microscopies, energy dispersive X-ray spectroscopy, X-ray powder diffraction, nuclear magnetic resonance spectroscopy - (27)A1-MAS-NMR and Si-29-MAS-NMR, nitrogen physisorption, Fourier transform infrared spectroscopy and inductively coupled plasma optical emission spectrometry. The sodium forms of Beta zeolites were transformed to the proton forms H-Beta by ion-exchange using aqueous solutions of NH4NO3 and thereafter evaluated in Prins cyclization of (-)-isopulegol with benzaldehyde. The best catalyst synthesized at 150 degrees C in the rotation mode for 17 h possessing an optimal combination of morphological and structural properties as well as concentration of acid sites demonstrated high (-)-isopulegol conversion (93%) along with high selectivity to the desired product (79%).
Synthesis of Beta zeolite catalysts was carried out using two different methods. The influence of such parameters as synthesis time and temperature, gel composition and gel ripening on the physico-chemical and catalytic properties of Beta zeolite catalysts was studied. A range of analytical methods was applied in this work including scanning and transmission electron microscopies, energy dispersive X-ray spectroscopy, X-ray powder diffraction, nuclear magnetic resonance spectroscopy - (27)A1-MAS-NMR and Si-29-MAS-NMR, nitrogen physisorption, Fourier transform infrared spectroscopy and inductively coupled plasma optical emission spectrometry. The sodium forms of Beta zeolites were transformed to the proton forms H-Beta by ion-exchange using aqueous solutions of NH4NO3 and thereafter evaluated in Prins cyclization of (-)-isopulegol with benzaldehyde. The best catalyst synthesized at 150 degrees C in the rotation mode for 17 h possessing an optimal combination of morphological and structural properties as well as concentration of acid sites demonstrated high (-)-isopulegol conversion (93%) along with high selectivity to the desired product (79%).
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