Effect of Structure and Acidity of Different Molecular Sieves for Alkylation Reaction of Benzene With 1 - Dodecene

The structure and acid property of Y.USY.ZSM - 5,β,M and MCM - 41 molecular sieve are characterized by XRD, NH3 - PTD, the IR spectra of pyridine adsorption, cumene cracking reaction and N2 physical adsorption/desorption techniques. The catalytic performance of different molecular sieves was researched in the alkylation reaction of benzene with 1 - dodecene. The alkylation reaction can be occurred over its mild and strong acid sites under the condition of 30 ~ 60 1C and a large feed velocity on the Y molecular sieve. The catalytic activity of Y has advantage of other molecular sieves and the conversion and the selectivity are more than 98% . Investigation shows that the molecular sieves of the pore less than twelve - membered rings can not used the alkylation reaction and the catalytic activity of the molecular sieves of three - dimensional pore is higher than that of one - dimensional and two - dimensional pore and when super - cage exist in the crystal the selectivity of 2 - and 3 - LAB is reduced. The molecular sieves with large amount of mild strong acidity have a long life in the reaction.