Solid-state nuclear magnetic resonance studies of the transformation of the zeolite Y catalyst in the course of hydrochlorination of 1-methylcyclohexene by thionyl chloride
[en] 1-Methylcyclohexene was hydrochlorinated with SOCl2 to 1-chloro-1-methylcyclohexane at room temperature in CH2Cl2 as the solvent and in presence of the faujasitic zeolite ZF520 catalyst. 4-Coordinated framework aluminium in the parent sample coexisting with a small amount of immobile extra-framework aluminium at ca. -1 ppm is completely removed after just one reaction run and transformed into two distinct 6-coordinated species resonating at 0.2 and -3.1 ppm. The former line is assigned to Al(H2O)63+ cations, the latter is likely to come from a species with mixed solvation shells, probably Al(Cl-)(H2O)52+ and Al(OH-)(H2O)52+. Crystallinity of the catalyst is seriously affected by the reaction. The spectra confirm that before reaction the zeolite contains Si(3Si,1OH) and Si(2Si,2OH) groups. During the reaction most hydroxyl groups created by dealumination are removed, although some Si(3Si,1OH) remain. MAS NMR spectra are fully consistent with the proposed reaction mechanism.
Disciplines :
Chemistry
Author, co-author :
Kolodziejski, Waclaw
Delaude, Lionel ; Université de Liège - ULiège > Département de chimie (sciences) > Chimie macromoléculaire et catalyse organique
Laszlo, Pierre ; Université de Liège - ULiège > Services généraux (Faculté des sciences) > Relations académiques et scientifiques (Sciences)
Montaufier, Marie-Thérèse
Klinowski, Jacek
Language :
English
Title :
Solid-state nuclear magnetic resonance studies of the transformation of the zeolite Y catalyst in the course of hydrochlorination of 1-methylcyclohexene by thionyl chloride
Akitt, Greenwood, Khandelwal (1972) Aluminium-27 nuclear magnetic resonance studies of sulphato-complexes of the hexa-aquo aluminium ion. Journal of the Chemical Society, Dalton Transactions 12:1226.
Canet, Delpuelch, Khaddar, Rubini J. Magn. Reson. 1973, 9:329.
Morrison, Boyd Organic Chemistry, Allyn and Bacon, Boston; 1973.
Mellor A Comprehensive Treatise on Inorganic and Theoretical Chemistry , Longmans, Green and Co, London; 1947, 10.
Barrer Zeolites and Clay Minerals as Sorbents and Molecular Sieves, Academic Press, London; 1978.
Engelhardt, Michel High-Resolution Solid-State NMR of Silicates and Zeolites, Wiley, New York; 1987.
Anderson, Klinowski J. Chem. Soc., Faraday Trans.1 1986, 82:1449.