Isobutane oxidative dehydrogenation catalyst, preparation method and application thereof
A technology for oxidative dehydrogenation and isobutane, applied in physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc., and can solve problems such as low selectivity
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Embodiment 1
[0031] Weigh 2.0 g of HMS carrier in the container, transfer 1.0 ml of 0.01003 g / ml chromium nitrate solution with a pipette, then transfer 1.0 ml of 0.01007 g / ml cerium nitrate solution with a pipette, and then add deionized water to 40 After stirring evenly, let it stand at room temperature for 4 hours, then add a magnetic stir bar and put it in a 60°C magnetic stirring constant temperature water bath to evaporate to dryness, then put it in a 100°C oven for 24 hours, and finally put it in a 600°C muffle furnace Medium roasting for 4 hours to obtain the desired catalyst. Adjust the flow of carbon dioxide and isobutane through a mass flow meter, the molar ratio of which is 5.0, enter the distributor for pre-mixing, and then enter the reaction zone. The reactor is heated by electric heating wire to make it reach the predetermined temperature. The inner diameter of the reactor is 8 mm stainless steel pipe, about 400 mm long. After the reaction gas passes through the condensatio...
Embodiment 2
[0034] Weigh 2.0 g of HMS carrier in the container, transfer 12.6 ml of 0.02308 g / ml chromium nitrate solution with a pipette, then transfer 3.1 ml of 0.01603 g / ml cerium nitrate solution with a pipette, and then add deionized water to 40 After stirring evenly, let it stand at room temperature for 24 hours, then add a magnetic stirrer and put it in a 85°C magnetic stirring constant temperature water bath to evaporate to dryness, then put it in a 120°C oven for 28 hours, and finally put it in a 650°C muffle furnace Medium roasting for 4 hours to obtain the desired catalyst. The evaluation conditions are the same as in [Example 1], and the results are as follows: the conversion rate of isobutane in this process is 40.0%, and the selectivity of isobutene is 92.0%.
Embodiment 3
[0036] Weigh 2.0 g of HMS carrier in the container, transfer 34.2 ml of 0.02308 g / ml chromium nitrate solution with a pipette, and then transfer 25.0 ml of 0.01603 g / ml cerium nitrate solution with a pipette, stir well, and Let it stand for 8 hours, then add a magnetic stirrer and put it in a 90°C magnetic stirring constant temperature water bath to evaporate to dryness, then put it in a 150°C oven for 36 hours, and finally roast it in a 800°C muffle furnace for 2 hours to obtain the required catalyst. The evaluation conditions are the same as in [Example 1], and the results are as follows: in this process, the conversion rate of isobutane is 35.3%, and the selectivity of isobutene is 92.2%.
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