Dehydrogenation catalyst for straight-chain paraffin and preparation method thereof
A dehydrogenation catalyst, straight-chain alkane technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc., can solve the problem of increased equipment investment, cumbersome process, carrier ratio Problems such as low surface area, to achieve the effect of simple and easy preparation process and reduced loss
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[0021] The preparation process of the dehydrogenation catalyst of the present invention will be described in detail below.
[0022] A preparation of lithium-containing alumina carrier
[0023] Al 2 (SO 4 ) 3 , with the basic aluminate NaAlO 2 solution or KAlO 2 The solution is gelled by the pH swing method, the pH value is low to 2-4, and the high value is 9.5-11.0. The temperature of the pH swing method gelation process is 70-90°C; the pH value swings 1-6 times; then add lithium-containing Salt solution, increase the temperature of the slurry to 90°C-180°C, preferably 130°C-170°C, and stabilize it for 0.5h-6.0h; filter and wash the obtained material, and add inorganic acid and / or organic acid to the wet material after washing , preferably a solution of nitric acid and / or acetic acid is stirred until a homogeneous thin paste-like slurry is obtained. The amount of nitric acid and / or acetic acid is Al 2 o 3 1%~12% of the feeding weight; the peptization time is 0.5h~5.0h....
Embodiment 1
[0031] Example 1 Carrier γ-Al 2 o 3 Preparation of pellets
[0032] Carrier Ⅰ: 2L sodium metaaluminate aqueous solution (Al 2 o 3 Concentration is 15g / 100mL) and 3L aqueous solution of aluminum sulfate (Al 2 o 3 Concentration of 2g / 100mL) into the container at the high position, the flowmeter connected to the bottom flows into the stainless steel container equipped with 6L clean water belt agitator and heating mantle, and is heated to 80°C; sodium metaaluminate solution is added to make the pH When the pH value rises to 9.8, stop adding sodium metaaluminate solution and keep it stable for 10 minutes; pass through aluminum sulfate solution to reduce the pH value to 3 and keep it stable for 10 minutes; pass through sodium metaaluminate solution to make the pH value rise to 10. Repeat the swing 3 times. After the swing, stabilize for 10 min, add 200 mL of an aqueous solution containing 1.65 g of lithium nitrate, heat up to 150 ° C, stabilize for 3 h, filter and separate the...
Embodiment 2
[0034] The preparation of embodiment 2 catalyst I
[0035] Take 100 g of the carrier I prepared in Example 1 and place it in a fluidized impregnation device. At the same time, take 35 ml of an aqueous solution of chloroplatinic acid containing 0.01 g / ml of platinum, 10.6 ml of 37% concentration of hydrochloric acid, and 10.6 ml of hydrochloric acid containing 0.025 g / ml of tin. 20ml of stannous aqueous solution, with 40% acetic acid solution as a solvent, mix the above-mentioned various solutions to obtain an impregnating solution, then use the peristaltic pump of the fluidized impregnating device to spray the solution evenly on the carrier and dry it, and use the unloaded catalyst Baked in a muffle furnace at 500 °C for 4 h. Then 40ml of ammonium sulfide solution with a sulfur content of 0.5% is used to make an impregnating solution to immerse the roasted catalyst, then dry it at room temperature for 6 hours, and then reduce the presulfided catalyst with hydrogen with a water...
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