A kind of cobalt-based catalyst and its method for propylene epoxidation reaction
A technology of cobalt-based catalyst and epoxidation reaction, which is applied in the direction of catalyst activation/preparation, catalyst carrier, chemical instruments and methods, etc., which can solve the problems of severe equipment corrosion, large investment, and long process, and achieve good stability and noble metal The effect of low dosage and high reactivity
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Embodiment 1
[0034] 5.0g ethyl orthosilicate, 2.0g magnesium hydroxide and 3.0g concentration of 35% concentrated hydrochloric acid, deionized water 60mL, stirred at 80 ℃ for 1h, cooled to room temperature, dropwise added 10g concentration of 10% (NH 4 ) 6 W 7 o 24 ·6H 2 O aqueous solution was stirred at room temperature for 15 minutes to obtain a uniform solid solution suspension, which was left to stand at 80°C for 8 hours, aged at room temperature for 48 hours, the gel was rotary evaporated to remove water, and dried in vacuum at 110°C to obtain a powdery solid. The solid was placed in a tube furnace and roasted under a nitrogen gas temperature program. Starting at 30°C, the temperature was raised to 300°C at a rate of 2.25°C / min, kept at 300°C for 4 hours, and then started at 300°C, and the temperature was raised at a rate of 2.5°C / min. To 600°C, keep at 600°C for 4h. After natural cooling, the SiO2-MgO-WO3 metal composite oxide carrier is obtained.
Embodiment 2
[0036] 6.0g ethyl orthosilicate, 2.0g magnesium hydroxide and 3.0g concentration of 35% concentrated hydrochloric acid, deionized water 60mL, stirred at 80 ℃ for 1h, cooled to room temperature, dropwise added 8g concentration of 10% (NH 4 ) 6 W 7 o 24 ·6H 2O aqueous solution was stirred at room temperature for 15 minutes to obtain a uniform solid solution suspension, which was left to stand at 80°C for 8 hours, aged at room temperature for 48 hours, the gel was rotary evaporated to remove water, and dried in vacuum at 110°C to obtain a powdery solid. The solid was placed in a tube furnace and roasted under a nitrogen gas temperature program. Starting at 30°C, the temperature was raised to 300°C at a rate of 2.25°C / min, kept at 300°C for 4 hours, and then started at 300°C, and the temperature was raised at a rate of 2.5°C / min. To 600°C, keep at 600°C for 4h. After natural cooling, the SiO2-MgO-WO3 metal composite oxide carrier is obtained.
Embodiment 3
[0038] 4.0g ethyl orthosilicate, 2.0g magnesium hydroxide and 3g concentration of 35% concentrated hydrochloric acid, deionized water 60mL, stirred at 80 ℃ for 1h, cooled to room temperature, dropwise added 8g concentration of 10% (NH 4 ) 6 Mo 7 o 24 ·6H 2 O aqueous solution was stirred at room temperature for 15 minutes to obtain a uniform solid solution suspension, which was left to stand at 80°C for 8 hours, aged at room temperature for 48 hours, the gel was rotary evaporated to remove water, and dried in vacuum at 110°C to obtain a powdery solid. The solid was placed in a tube furnace and roasted under a nitrogen gas temperature program. Starting at 30°C, the temperature was raised to 300°C at a rate of 2.25°C / min, kept at 300°C for 4 hours, and then started at 300°C, and the temperature was raised at a rate of 2.5°C / min. To 600°C, keep at 600°C for 4h. After natural cooling, a SiO2-MgO-MoO3 metal composite oxide carrier is obtained.
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