Composite metal oxide type alkane dehydrogenation catalyst and preparation method thereof
A technology of alkane dehydrogenation and composite metal, applied in the direction of metal/metal oxide/metal hydroxide catalyst, carbon compound catalyst, physical/chemical process catalyst, etc., can solve the problem of low conversion rate and selectivity of catalyst, conversion rate and Selectivity cannot be coordinated, industrial application conditions are quite different, etc., to achieve the effect of low price, high mechanical strength and high selectivity
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[0029] As preferably, the preparation method of described alkane dehydrogenation catalyst comprises the following steps:
[0030] (1) Dissolve a certain amount of A and B precursors in water, stir evenly, and use sol-gel method, co-precipitation method or hydrothermal synthesis method to obtain active components AxB2-xO3 after drying and roasting;
[0031] (2) Grind the active component obtained in step (1) into a fine powder below 20 μm, mix it with the precursor of the carrier evenly, adopt different molding processes, and roast at 450-800 °C for 2-8 hours to obtain a fixed-bed , moving bed, fluidized bed catalyst.
[0032] Preferably, the alkane dehydrogenation catalyst may also contain optional additives, such as extrusion agents, rheology control agents, binders, surfactants and the like.
Embodiment 1
[0036] Dissolve 40.61g of ferric nitrate nonahydrate and 87.99g of aluminum nitrate nonahydrate in water, stir evenly, add an appropriate amount of ammonia water, adjust the pH to about 6.5-7.5, let stand for 4 hours, dry at 120°C for 8 hours, and roast at 620°C for 4 hours to obtain the activity Component Fe0.6Al1.4O3;
[0037] Grind the obtained active components into fine powders below 20 μm, mix them evenly with 54.29 g of pseudoboehmite and 166.7 g of silica sol, add an appropriate amount of nitric acid, adjust the pH to 3-4, spray molding, and roast at 600 ° C for 3 hours to obtain Catalyst 1.
[0038] The evaluation results of the catalyst showed that the conversion rate of propane was 34.65%, and the selectivity was 85.76%.
Embodiment 2
[0040] Dissolve 19.90g of scandium chloride and 73.94g of aluminum nitrate nonahydrate in water, stir well, add an appropriate amount of sodium carbonate to precipitate scandium chloride and aluminum nitrate, filter, wash 4 times, dry at 100°C for 6 hours, and roast at 680°C for 6 hours , to obtain the active component Sc0.8Al1.2O3;
[0041] Grind the obtained active component into a fine powder below 20 μm, mix it with 80 g of titanium oxide and 5.3 g of turnip powder, press it into a tablet, and calcinate at 500° C. for 3 hours to obtain Catalyst 2.
[0042] The evaluation results of the catalyst showed that the conversion rate of propane was 36.03%, and the selectivity was 86.24%.
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