KINETIC-STUDY OF 1,5-CYCLOOCTADIENE HYDRO-ISOMERIZATION ON PD PUMICE CATALYSTS/

A new route for obtaining 1,4-cyclooctadiene by catalytic isomerizatio n of 1,5-cyclooctadiene at low temperature in presence of HZ in a thre e-phase reactor is presented. Wei, Prater and Silvestri methods are us ed for the kinetic studies. A comparison of the activity-selectivity p atterns of the Pd/pumice catalysts with Pd on silica and Pt and Pd-Pt on pumice catalysts is performed. Although Pt catalysts are not active in the hydro-isomerization of 1,5-cyclooctadiene, the presence of sma ll amount of Pt in Pd/pumice catalysts increases the yield to 1,4-cycl ooctadiene. Besides the catalyst characteristics, temperature and H-2 pressure influence the production of 1,4-cyclooctadiene. A mechanism o f the process is proposed.