Several zeolite catalysts such as SAPO-11, ZSM-11, ZSM-12, etc. were selected to convert 1 -hexene to branched hexenes in this work. Pore size of the zeolite catalyst plays an important role on the yield and the distribution of branched isohexenes. And the zeolite catalysts with the pore size of 0.6nm are optimum to produce dimethylbutenes (DMB). SAPO-11 zeolite is a suitable skeletal isomerization catalyst, especially in the production of methyl pentenes. Under the following reaction conditions: WHSV=1.0 h~(-1), H_2/hexene=8, T=250°C, P=0.2 MPa, the yield of skeletal isohexenes remains above 80% at the prolonged time-on stream of 80 h, accompanying low C_(5-), C_(7+) products and low carbon deposition on the catalyst.
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