Abstract
The adsorption of ethylene and its conversion to hydrocarbons on zeolite H-ZSM-5 as catalyst was investigated by 13C NMR. On a dehydrated zeolite, surface alkylation and polymerization of ethylene are observed even below room temperature. Thermal cracking of this polymer at 573 K leads to paraffins only, while steam cracking yields paraffinic and olefinic products. On a hydrated surface, competition between ethylene and water for the active acid sites takes place and no reaction of ethylene occurs up to 523 K. At 573 K, oligomerization and conjunct polymerization give rise to paraffinic, olefinic and aromatic products.
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