R. Ohnishi et al., SELECTIVITY CONTROLLING IN THE HYDROGENATION OF 1,3-BUTADIENE ON TL-MODIFIED PD CATALYST, Catalysis letters, 33(3-4), 1995, pp. 341-348
The selectivity and reactivity in the hydrogenation of 1,3-butadiene c
atalyzed by T-1-modified 5 wt% Pd/Al2O3 catalysts vary with amounts of
T1 loading and with the reduction temperatures, that is, the main pro
duct was l-butene and trans-2-butene for values of T1 loading of 0.5 a
nd 2 in T1/Pd atomic ratio, respectively, when the catalysts were redu
ced at 673 K. 1,3-butadiene was hydrogenated selectively towards l-but
ene and trans-2-butene when the T1 modified 5 wt% Pd/Al2O3 catalyst of
T1/Pd = 2 was reduced at 300 and 373 K or above, respectively. On the
catalyst with T1/Pd 2 reduced at 373 K or above, the butenes formed a
re not hydrogenated to butane, even after a long reaction time. These
results suggest the formation of Pd-T1 alloy or intermetallic compound
s during the reduction procedure which is responsible for the selectiv
ity controlling in the reaction. TPR and XRD results were in consisten
ce with the reaction data.