Direct epoxidation process using improved catalyst composition
a technology of catalyst composition and epoxidation process, which is applied in the field of direct epoxidation process using improved catalyst composition, can solve the problems of prone to produce non-selective byproducts, and achieve the effect of reducing alkane byproducts
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example 1
PREPARATION OF Pd-Bi-Pb / TiO2, Pd-Bi / TiO2, and Pd-Au / TiO2 CATALYSTS
[0034]Catalyst 1A (Pd-Bi-Pb / TiO2):
[0035]Lead nitrate (0.69 g) and an aqueous solution of disodium palladium tetrachloride (1.11 g, 19.7 wt. % Pd) are added to a solution of bismuth nitrate (0.3 g Bi(NO3)3 dissolved in 15 mL, 2.56 M solution of nitric acid, 16.6% by volume of 70% HNO3) with mixing. The Pd-Bi-Pb solution is then added by incipient wetness to spray dried titania (20 g, 30 micron size, 40 m2 / g, calcined in air at 700° C.). The solids are calcined in air in a muffle furnace by heating at 10° C. / min to 110° C. for 4 hours and then at 2° C. / min to 300° C. for 4 hours. These calcined solids are then washed with an aqueous sodium bicarbonate solution (40 mL, containing 2.25 g NaHCO3), followed by deionized water (40 mL, four times). The washed solids are vacuum dried (20 torr) at 50° C. for 16 hours and then calcined in a muffle furnace by heating at 10° C. / min to 110° C. for 4 hours and then heating at 2° C. / ...
example 2
EPOXIDATION REACTION USING CATALYSTS FROM EXAMPLE 1
[0040]A 300 cc stainless steel reactor is charged with the supported noble metal catalyst (0.07 g of 1A, 1B, or 1C), TS-1 powder (0.63 g), methanol (˜100 g), and a buffer solution (13 g of 0.1 M aqueous ammonium phosphate, pH=6). The reactor is then charged to 300 psig with a feed consisting of 2% hydrogen, 4% oxygen, 5% propylene, 0.5% methane and the balance nitrogen (volume %) for runs utilizing a 2:1 O2:H2 ratio or a feed consisting of 4% hydrogen, 4% oxygen, 5% propylene, 0.5% methane and the balance nitrogen (volume %) for runs utilizing a 1:1 O2:H2 ratio. The pressure in the reactor is maintained at 300 psig via a backpressure regulator with the feed gases passed continuously through the reactor at 1600 cc / min (measured at 23° C. and one atmosphere pressure). In order to maintain a constant solvent level in the reactor during the run, the oxygen, nitrogen and propylene feeds are passed through a two-liter stainless steel vess...
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