Dehydrogenation catalyst for light alkanes and preparation method thereof

[0025] Preparation of the carrier: Select 200g of ZSM-5 molecular sieve with a relative crystallinity of 50% and a silicon-aluminum ratio of 100, mix them evenly with 350g of alumina and 25g of turnip powder, add 50g of dilute nitric acid solution with a mass concentration of 10%, knead and extrude forming. The molded carrier was dried in the shade for 24 hours, then dried in an oven at 110° C. for 12 hours, and then baked in a muffle furnace at 600° C. for 6 hours.

[0026]Loading of active components and additives: impregnate the calcined bar-shaped carrier with an aqueous solution containing an appropriate amount of chloroplatinic acid, tin tetrachloride and hydrochloric acid, then dry at 110°C for 4 hours, and then bake at 500°C for 4 hours. Then the catalyst was impregnated with an aqueous solution containing potassium nitrate, dried at 110°C for 4 hours, and calcined at 500°C for 4 hours. The percentage by weight of each elemental metal in the prepared catalyst to the carr

[0039] Preparation of the carrier: Select 200g of ZSM-5 molecular sieve with a relative crystallinity of 70% and a silicon-aluminum ratio of 100, mix them evenly with 350g of alumina and 25g of turnip powder, add 50g of dilute nitric acid solution with a mass concentration of 10%, knead and extrude forming. The molded carrier was dried in the shade for 24 hours, then dried in an oven at 110° C. for 12 hours, and then baked in a muffle furnace at 600° C. for 6 hours.

[0040] Loading of active components and additives: impregnate the calcined strip carrier with an aqueous solution containing appropriate amount of chloroplatinic acid, tin tetrachloride and hydrochloric acid, then dry at 110°C for 5 hours, and then bake at 500°C for 6 hours. The catalyst was impregnated with an aqueous solution containing potassium nitrate, dried at 110°C for 4 hours, and calcined at 500°C for 6 hours. The percentage by weight of each elemental metal in the prepared catalyst to the carrier is: Pt1w

[0042] Preparation of the carrier: Select 200g of ZSM-5 molecular sieve with a relative crystallinity of 60% and a silicon-aluminum ratio of 180, mix them evenly with 500g of alumina and 35g of turnip powder, add 80g of dilute nitric acid solution with a mass concentration of 8%, knead and extrude forming. The molded carrier was dried in the shade for 24 hours, then dried in an oven at 110° C. for 12 hours, and then baked in a muffle furnace at 600° C. for 6 hours.

[0043] Loading of active components and additives: impregnate the calcined bar-shaped carrier with an aqueous solution containing an appropriate amount of chloroplatinic acid, tin tetrachloride and hydrochloric acid, then dry at 110°C for 4 hours, and then bake at 500°C for 5 hours. Then the catalyst was impregnated with an aqueous solution containing potassium nitrate, dried at 110°C for 5 hours, and calcined at 500°C for 4 hours. The percentage by weight of each elemental metal in the prepared catalyst to the carr