ISSN:
1573-1111
Keywords:
N-hexylammonium
;
montmorillonite
;
catalytic decomposition reaction
;
intercalate
;
layer charge
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract It was found that the variation in the thermally evolved gases obtained by decomposition ofn-hexylammonium layered aluminosilicates is mainly due to the difference between octahedral and tetrahedral coordination of aluminium in the lattice and also to the contribution of the excess negative layer charges. ESCA, TG-DSC, GC and MS results indicate that the layer charge originated from the octahedral substitution induces only desintercalation ofn-hexylamine around 250–360°C, whereas that from the tetrahedral substitution induces the catalytic decomposition reaction involving the cleavage of C−N and C−C bonds at 350–450°C with the evolution of ammonia, ethylene, pentene and hexene. It is therefore concluded that the former reaction step is a simple desintercalation, but for the latter one a Brönsted acid catalytic mechanism is proposed.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00664106
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