Methane oxidative coupling catalyst, preparation method thereof and method for preparing ethylene through methane oxidative coupling
A technology of oxidative coupling and catalysts, which is applied in the direction of carbon compound catalysts, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc., and can solve the problem that there are many reaction steps and multi-step methods are not economically reasonable choices, etc. problems, to achieve the effect of improving catalyst activity, high industrial application prospects, and simple steps
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[0022] In the catalyst preparation method of the present invention, the calcination temperature may be, for example, 500-850° C., and the calcination time may be, for example, 2-10 hours. Preferably, the roasting process includes: heating the dried product to 600-850°C (more preferably 650-850°C) at a constant rate of 3-15°C / min (more preferably 5-10°C / min) , and incubated for 2-10 hours (more preferably incubated for 4-8 hours).
[0023] In the catalyst preparation method of the present invention, the soluble salts of manganese and gallium can be various water-soluble active component precursors, as long as various oxides of manganese and gallium oxide can be formed respectively by roasting . The soluble salt of manganese is preferably manganese nitrate, and the soluble salt of gallium is preferably gallium nitrate. The gallium nitrate usually exists in the form of its hydrate.
[0024] In the preparation method of the present invention, each active component is supported ...
Embodiment 1
[0050] Dissolve 7.03g of manganese nitrate solution in 35mL of water, add 18g of cristobalite carrier, stir at room temperature for 1h, rotate evaporate at 80°C for 2h, and dry at 110°C for 3h to obtain manganese-impregnated cristobalite.
[0051] Dissolve 0.20 g of sodium tungstate dihydrate in 20 mL of water, add cristobalite impregnated with manganese, stir at room temperature for 1 h, rotate evaporate at 80 °C for 3 h, and dry at 120 °C for 2 h to obtain cristobalite impregnated with manganese and sodium tungstate.
[0052] Dissolve 0.05g of gallium nitrate hydrate in 20mL of water, add cristobalite impregnated with manganese and sodium tungstate, stir at 50°C for 1.5h, rotate at 80°C for 2h, dry at 110°C for 3h, and then dry in air Heat up to 800°C at a rate of 5°C / min and bake for 5h. After cooling to room temperature, catalyst A1 (Na 2 WO 4 -Mn-Ga 2 o 3 / cristobalite); Wherein, based on the weight of cristobalite, the mass percentage of active component is: Na 2 WO...
Embodiment 2
[0061] Dissolve 4.68g of manganese nitrate solution in 30mL of water, add 18g of cristobalite carrier, stir at room temperature for 1h, rotary evaporate at 80°C for 2h, and dry at 150°C for 5h to obtain manganese-impregnated cristobalite.
[0062] Dissolve 1.21g of sodium tungstate dihydrate in 25mL of water, add cristobalite impregnated with manganese, stir at room temperature for 1 hour, rotate evaporate at 80°C for 2 hours, and dry at 180°C for 2 hours to obtain cristobalite impregnated with manganese and sodium tungstate.
[0063] Dissolve 0.005g of gallium nitrate hydrate in 20mL of water, add cristobalite impregnated with manganese and sodium tungstate, stir at 40°C for 1h, rotate at 80°C for 2h, dry at 150°C for 2h, and then dry in air for 5 The rate of ℃ / min was raised to 850℃ for 8h. After cooling to room temperature, catalyst A2 (Na 2 WO 4 -Mn-Ga 2 o 3 / cristobalite); Wherein, based on the weight of cristobalite, the mass percentage of active component is: Na 2 ...
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