Epoxidation catalyst
a technology of epoxidation catalyst and catalyst, which is applied in the direction of catalyst activation/preparation, physical/chemical process catalyst, organic chemistry, etc., can solve the problems of prone to produce by-products and silver catalysts that have not proved useful in commercial epoxidation of higher olefins, and achieve the effect of higher selectivity to the desired epoxid
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Benefits of technology
Problems solved by technology
Method used
Examples
example 1
Edta Treatment of TS-1 Catalyst
[0036] TS-1 can be made according to any known literature procedure. See, for example, U.S. Pat. No. 4,410,501, DiRenzo, et. al., Microporous Materials (1997), Vol. 10, 283, or Edler, et. al., J. Chem. Soc., Chem. Comm. (1995), 155.
[0037] Catalyst 1A: Spray dried TS-1 (15 g, 80% TS-1, silica binder, 2.0 wt. % Ti, calcined at 550° C. in air) is suspended in a saturated aqueous ethylenediaminetetraacetic acid (EDTA) solution (150 mL of 0.5 wt. % EDTA) solution and stirred at 60° C. for 18 hours. After filtration and washing (3 times with 100 mL water), the obtained solid is air-dried at 110° C., and calcined in air at 550° C. for 4 hours. Catalyst 1A contains 1.8 wt. % Ti.
[0038] Catalyst 1B: Spray dried TS-1 (20 g, 80% TS-1, silica binder, 2.0 wt. % Ti, calcined at 550° C. in air) is suspended in an aqueous dipotassium ethylenediaminetetraacetic acid dihydrate (K2EDTA) solution (300 g of 3 wt. % K2EDTA solution) and stirred at 60° C. for 18 hours. Aft...
example 2
Epoxidation of Propylene with Hydrogen Peroxide
[0039] Spray dried TS-1 (as a comparative example), Catalysts 1A and 1B are used in batch epoxidation of propylene with hydrogen peroxide according to the following procedure:
[0040] A solution of methanol, water and hydrogen peroxide (40 g of solution, 84% MeOH, 11% H2O, and 5% H2O2) is added to a 125-mL PARR reactor equipped with a stirring bar. The catalyst (0.15 g) is suspended in the reaction solution, and the reactor is charged with propylene (20 g). The closed system is then heated at 50° C. for 30 minutes. The concentration of unreacted hydrogen peroxide is determined by titration (sodium thiosulfate method) and the products are analyzed with GC.
[0041] The results are shown in Table 1.
example 3
Preparation of Pd / TS-1 Catalysts
[0042] Comparative Catalyst 3A: Spray dried TS-1 (16 g, 80% TS-1, silica binder, 2.0 wt. % Ti, calcined at 550° C. in air) is slurried in water (14 g). An aqueous solution of tetra ammine palladium dinitrate (0.299 g aqueous solution containing 5.37 wt. % Pd) is then added, and the slurry is stirred at 30° C. for 10 minutes. The pH is adjusted to 7.0 with 30 wt. % ammonium hydroxide and the slurry is stirred at 30° C. for an additional 35 minutes before adjusting the pH to 7.6. The slurry is filtered and the filter cake is washed with water (100 mL, three times). The solids are vacuum dried at 55° C. for 6 hours, then calcined in air at 300° C. for 4 hours. The calcined solids are then transferred to a quartz tube, heated to 100° C. and treated with 5 vol. % hydrogen in nitrogen (100 cc / min) for 1 hour. The dried solid contains 0.1 wt. % Pd and 2.0 wt. % Ti.
[0043] Catalyst 3B: Catalyst 3B is made according to the procedure of Comparative Catalyst 3A...
PUM
| Property | Measurement | Unit |
|---|---|---|
| temperature | aaaaa | aaaaa |
| temperature | aaaaa | aaaaa |
| temperature | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More