Reduction method, catalyst and application of catalyst for preparing propylene oxide by propylene epoxidation
A technology of propylene oxide and catalyst, which is applied in the application field of the catalyst in the direct epoxidation of propylene to prepare propylene oxide system, which can solve the problems of low propylene oxide generation rate, low activity, gap, etc., and achieve an increase in the generation rate , good active effect
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Embodiment 1
[0064] This example illustrates the test results of the Au / TS-1 catalyst reduced with a mixed gas of hydrogen and ethylene at 200°C in the epoxidation of propylene.
[0065] Get 0.15g of fresh catalyst, pack in the reaction tube, pass into the volume is 5% H 2 and C 2 h 4 The mixed gas, the diluent gas is nitrogen, and the total gas flow rate is 20mL / min. The reaction furnace was raised from room temperature to 200 °C at a rate of 1 °C / min, kept at constant temperature for 1 h, and finally cooled down to room temperature naturally. The mixed gas of propylene, oxygen, hydrogen, and nitrogen with a volume ratio of 5 / 5 / 5 / 85 is passed into the reaction furnace at a flow rate of 20mL / min, and the reaction furnace is raised from room temperature to 200°C at a rate of 1°C / min. Epoxidation reaction with catalyst.
[0066] The result after reacting 10h is as follows: the conversion ratio of propylene is 7.0%, the selectivity of propylene oxide is 87%, and the generation rate of pro...
Embodiment 2
[0068] This example illustrates the test results of the Au / TS-1 catalyst reduced with a mixed gas of hydrogen and ethylene at 300°C in the epoxidation of propylene.
[0069] Get 0.15g of fresh catalyst, pack in the reaction tube, pass into the volume is 5% H 2 and C 2 h 4 The mixed gas, the diluent gas is nitrogen, and the total gas flow rate is 20mL / min. The reaction furnace was raised from room temperature to 300 °C at a rate of 1 °C / min, kept at a constant temperature for 1 h, and finally cooled down to room temperature naturally. The mixed gas of propylene, oxygen, hydrogen, and nitrogen with a volume ratio of 5 / 5 / 5 / 85 is passed into the reaction furnace at a flow rate of 20mL / min, and the reaction furnace is raised from room temperature to 200°C at a rate of 1°C / min. Epoxidation reaction with catalyst.
[0070] Figure 4 The test results of the catalyst reduced by the mixture of hydrogen and ethylene at 300°C in the epoxidation of propylene are shown. The result aft...
Embodiment 3
[0072] This example illustrates the test results of the Au / TS-1 catalyst reduced with the mixed gas of hydrogen and propylene in the epoxidation of propylene at 200°C.
[0073] Get 0.15g of fresh catalyst, pack in the reaction tube, pass into the volume is 5% H 2 and C 3 h 6 The mixed gas, the diluent gas is nitrogen, and the total gas flow rate is 20ml / min. The reaction furnace was raised from room temperature to 200 °C at 1 °C / min, kept at constant temperature for 1 h, and finally cooled down to room temperature naturally. The mixed gas of propylene, oxygen, hydrogen, and nitrogen with a volume ratio of 5 / 5 / 5 / 85 is passed into the reaction furnace at a flow rate of 20mL / min, and the reaction furnace is raised from room temperature to 200°C at a rate of 1°C / min. Epoxidation reaction with catalyst.
[0074] The result after reacting 10h is as follows: the conversion rate of propylene is 8.1%, the selectivity of propylene oxide is 85.6%, and the generation rate of propylene...
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