Method for activating dehydrogenation catalyst by employing low concentration hydrogen via low temperature reduction
A dehydrogenation catalyst, low-concentration technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of rapid decline in catalyst activity and poor stability, To achieve the effect of avoiding the aggregation of catalyst active metals
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[0012] The dehydrogenation catalyst can be prepared by a conventional method, such as using an impregnation method to support the dehydrogenation active metal, and the auxiliary agent can be introduced during the preparation of the alumina carrier and / or by an impregnation method.
[0013] The catalyst of the present invention takes Sn-containing alumina or weakly acidic molecular sieve as a carrier, and the dehydrogenation active metal component is generally selected from one or more of platinum, palladium, iridium, rhodium or osmium in the platinum group, preferably platinum, The dosage is 0.01%~2% of the weight of the carrier in terms of simple substance. The content of Sn is 0.1%~10% of the weight of the carrier in terms of simple substance.
[0014] In the dehydrogenation catalyst with Sn-containing alumina or weak acid as the carrier of the present invention, Sn is introduced into the Sn-containing material when the alumina is gelled, and then made into a carrier.
[00...
example 1
[0031] Preparation of Sn-containing alumina support. After mixing a certain amount of 0.98M aluminum trichloride solution and 0.01M tin tetrachloride solution, add a certain amount of 8% ammonia water, mix evenly in a neutralization tank at 60~80°C, and control the pH value from 7.0~ 9.0, after filtering, washing with water and acidifying, pressurize into spheres in an oily ammonia column, dry, age, and roast at 650~750°C for 4 hours to obtain alumina pellets containing 0.8wt% Sn.
[0032] The alumina pellet carrier containing 0.8% Sn was calcined at 800°C for 3h, the calcined carrier was immersed in an aqueous solution containing chloroplatinic acid for 6h at 70°C, dried at 120°C for 2h, and calcined at 500°C for 4h. Then activate in air containing water vapor for 4h. Then at 70 °C with KNO 3 Soaked in aqueous solution for 2h, dried and roasted under the same conditions. The loading of each component in the catalyst is: Pt 0.3wt%, Sn 0.8wt%, K 0.7wt%.
[0033] Activation ...
example 2
[0042] Preparation of Sn-containing alumina support. After mixing a certain amount of 1.08M aluminum trichloride solution and 0.01M tin tetrachloride solution, add a certain amount of 10% ammonia water, mix evenly in a neutralization tank at 60~80°C, and control the pH value of 7.0~ 9.0, after filtering, washing with water and acidifying, pressurize into spheres in an oil ammonia column, dry, age, and roast at 650~750°C for 4 hours to obtain alumina pellets containing 1.0wt% Sn.
[0043] The alumina pellet carrier containing 1.0% Sn was calcined at 800 °C for 3 h, the calcined carrier was immersed in an aqueous solution containing chloroplatinic acid for 4 h at 70 °C, dried at 120 °C for 2 h, calcined at 500 °C for 4 h, and Activation in air containing water vapor for 4h. Then at 70 °C with KNO 3 Soaked in aqueous solution for 2h, dried and roasted under the same conditions. The loading of each component in the catalyst is: Pt 0.7wt%, Sn 1.0wt%, K 1.0wt%.
[0044] Activati...
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