Abstract
Abstract The effect of mixed Al 2 O 3 structure between θ- and α-Al 2 O 3 on the properties of Pd/Al 2 O 3 was investigated in the gas-phase selective hydrogenation of 1,3-butadiene under industrial simulated conditions. The mixed-phase Al 2 O 3 supports containing 100/0, 80/20, 40/60, and 0/100 (%) θ/α Al 2 O 3 were obtained by calcination of bayerites at 960–1200 °C for 3 h. The BET surface area and acidity of the Al 2 O 3 supports decreased monotonically with increasing weight (%) of α-Al 2 O 3 . As revealed by X-ray photoelectron spectroscopy (XPS), there was no electronic modification of Pd surface and the hydrogenation of 1,3-butadiene on Pd/Al 2 O 3 appeared to be dependent on Pd dispersion, support acidity, and Al 2 O 3 structure. While high Pd dispersion/support acidity resulted in high hydrogenation rate, the bimodal pore structure of the mixed-phases Al 2 O 3 (i.e., 80/20 θ/α-Al 2 O 3 ) played important role in lowering butane selectivity at complete conversion of 1,3-butadiene without altering the 2-butene selectivity.
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