Adsorption and activation of ethene by zeolite-H-ZSM-5
Thermogravimetric adsorption data for C2H4 and H2O and i.r. and n.m.r. spectroscopic results are combined to obtain information on the role played by acidic Brönsted sites in the H-ZSM-5 zeolite in the adsorption and activation of C2H4. Water and ethene compete for such sites in various ways which depend on the pretreatment of the zeolite. Physisorbed water prevents the adsorption of C2H4. Ethene is readily activated and reacts on the Brönsted acidic sites, even at room temperature. There is further evidence for the formation of carbenium-type intermediates.