A kind of catalyst for dehydrogenation of light alkane to olefin and its preparation method and use
A technology for alkane dehydrogenation and catalysts, which is applied in the direction of catalysts, carbon compound catalysts, chemical instruments and methods, etc. It can solve the problems of inconvenient regeneration of catalysts and achieve the effects of improving wear resistance and process performance
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[0034] The preparation method of this light paraffin dehydrogenation to olefin catalyst comprises the following steps:
[0035] S1, preparing a doped magnesia-aluminum spinel carrier;
[0036] The carrier is prepared by the sol-gel method + spray drying method:
[0037] A: Take a certain amount of pseudo-boehmite, add an appropriate amount of deionized water, and stir in a water bath at a certain temperature to obtain a uniform slurry A; the mass ratio of pseudo-boehmite to deionized water is (0.5-1) : (2-5), the temperature of water bath stirring is 50℃-80℃.
[0038] B: take by weighing an appropriate amount of magnesium nitrate, and add a small amount of auxiliary agent 1 and add deionized water to dissolve to obtain solution B;
[0039] C: Add the B solution to the A slurry evenly, add an appropriate amount of auxiliary agent II and stir evenly, dilute it with concentrated nitric acid and water with a volume ratio of 1:1 to form nitric acid, and then adjust it with nitric...
Embodiment 1
[0055] A kind of preparation method of light paraffin dehydrogenation to olefin catalyst, comprises the following steps:
[0056] S1, preparing a doped magnesia-aluminum spinel carrier;
[0057] A: Add an appropriate amount of deionized water to 0.2mol of pseudo-boehmite, and stir in a water bath at 65°C to obtain a uniform slurry A; the mass ratio of pseudo-boehmite to deionized water is 1:3.
[0058] B: Weigh 0.1mol of magnesium nitrate, and add 0.05mol of gallium nitrate to dissolve in deionized water to obtain solution B;
[0059] C: Add the B solution to the A slurry uniformly, add 0.002mol polyacrylamide and stir evenly, dilute with concentrated nitric acid and water by volume 1:1, then add it to adjust the gel, and adjust the pH value to be about 3;
[0060] D: The prepared gel is sprayed by the method of spray granulation to obtain a powdered carrier precursor, which is then calcined at 700°C for 4 hours as a carrier for use.
[0061] S2, sedimentation-precipitation ...
Embodiment 2
[0066] A kind of preparation method of light paraffin dehydrogenation to olefin catalyst, comprises the following steps:
[0067] S1, preparing a doped magnesia-aluminum spinel carrier;
[0068] A: Add an appropriate amount of deionized water to 0.2mol of pseudo-boehmite, and stir in a water bath at 65°C to obtain a uniform slurry A;
[0069] B: Weigh 0.1mol of magnesium sulfate, and add 0.05mol of gallium nitrate to dissolve in deionized water to obtain solution B;
[0070] C: Add the B solution to the A slurry uniformly, add 0.001mol melamine and stir evenly, dilute it with concentrated nitric acid at a volume ratio of 1:1, then add it to adjust the gel, and adjust the pH value to be about 4;
[0071] D: The prepared gel is sprayed by the method of spray granulation to obtain a powdered carrier precursor, which is then calcined at 700°C for 4 hours as a carrier for use.
[0072] S2, sedimentation-precipitation method to load Pt;
[0073] Disperse 10 g of the above carrier...
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