Article (Scientific journals)
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
Kolodziejski, Waclaw; Delaude, Lionel; Laszlo, Pierre et al.
1993In Applied Catalysis A: General, 98 (1), p. 71-79
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Keywords :
Catalyst Characterization (NMR, XRD); Methylcyclohexene Hydrochlorination; Nuclear Magnetic Resonance; Reaction Mechanism; Thionyl Chloride; Zeolite-Y; Zeolites
Abstract :
[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
Publication date :
1993
Journal title :
Applied Catalysis A: General
ISSN :
0926-860X
eISSN :
1873-3875
Publisher :
Elsevier Science, Amsterdam, Netherlands
Volume :
98
Issue :
1
Pages :
71-79
Peer reviewed :
Peer Reviewed verified by ORBi
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