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, Seules les zéolithes HZSM-5 présentant des aluminiums extra-réseaux et des ions iminiums (HZ15 et HZ25) sont actives pour la transformation de l'éthylène car leur présence permet d'exalter la force des protons et donc de rendre ces derniers actifs, vol.25

, Les paraffines (éthane, propane et butanes) sont secondaires et seraient issues d'un transfert d'hydrogène entre leurs oléfines respectives et des naphtènes. L'hydrogène est un produit secondaire issu de la déshydrogénation des naphtènes en aromatiques. Ces derniers sont eux aussi secondaires mais ils ne sont pas majoritaires. L'aromatique majoritaire est le toluène. Notons tout de même la présence d'éthylbenzène à haute conversion, Les oléfines en C3 et C4 apparaissent comme primaires

, De ces résultats, il nous est possible de proposer un schéma réactionnel apparent (Figure 21)

, Proposition de schéma réactionnel apparent de la transformation de l'éthylène à 500°C sur la zéolithe HZSM-5, Figure, vol.21

. De-50%, En effet, au-dessus de cette conversion, l'hydrogène formé est consommé pour hydrogéner les oléfines, changeant ainsi le mode de croissance du coke et permettant la désorption plus rapide des molécules de coke. Ce dernier devient plus polyaromatique et plus toxique alors qu'en dessous de cette conversion, les molécules de coke sont plus alkylées, Ensuite nous avons montré que la balance (ZnOH) + / H + est un descripteur de la stabilité d'un catalyseur bifonctionnel Zn/HZSM-5

, Enfin des tests de réjuvénation et de régénération ont été effectués sans donner des résultats probants pour le moment

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, En aval de ce dernier, un second réacteur chargé d'un catalyseur de type Zn/ZSM