The latter reaction was favoured at high conversions, long contact times and high aluminium contents. The linear olefins (mainly butenes) should be the primary products of the cracking of n-hexane and, as such, should be considered as the main source of the subsequent reactions, notably the hydride transfer reactions. This decomposition leads to n-alkanes and adsorbed carbenium ion-like species or, most probably, to n-olefins. The analysis of the kinetic parameters and selectivities showed that the reaction predominantly proceeded through the protolytic monomolecular mechanism involving the formation then the decomposition of an adsorbed carbonium ion-like species. The reaction was found of first order in the partial pressure of n-hexane and second order in the aluminium content of the zeolites. The reaction mechanisms of the cracking of n-hexane over MFI zeolites ( Si Al =10–75) have been studied at 400☌ at low conversions in a microflow reactor.
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