IR study of adsorption and reaction of 1-butene on H-ZSM-5

Adsorption and reaction of l-butene on H-ZSM-5 were studied by FT-IR spectroscopy. The adsorbed l-butenes were converted to cis-and trans-2-butenes below 250 K under evacuation, and dimerization of the adsorbed 2-butenes was observed at room temperature. The produced dimer was tentatively assigned to 3,4-dimethyl-3-hexene which hydrogen-bonded to the acidic OH groups with its alkyl chains. Therefore, the reaction terminated at the dimerization since proton transfer from H-ZSM-5 to the dimer did not occur.