Supported catalyst, preparation method thereof and method for preparing ethylene through oxidative coupling of methane
A supported catalyst, catalyst technology, applied in catalysts, carbon compound catalysts, chemical instruments and methods, etc., can solve the problems of uneconomical and reasonable selection, many steps, etc., to promote the oxidative coupling reaction of methane, wide application prospects, The effect of improving content and yield
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[0018] According to a second aspect of the present invention, the present invention provides a method for preparing a supported catalyst, the method comprising: in the presence of water, cristobalite is contacted with a soluble salt of manganese, sodium tungstate and ytterbium soluble salt, Dry and roast.
[0019] The present invention has no particular limitation on the cristobalite, which may be commercially available cristobalite, or may be prepared by calcination of amorphous silicon dioxide at high temperature. Direct selection of cristobalite as the carrier can make the prepared shaped catalyst have higher compressive strength, which is conducive to industrial scale-up and use.
[0020] According to the preparation method of the present invention, the consumption of the cristobalite, the soluble salt of manganese, sodium tungstate, and the soluble salt of ytterbium makes in the prepared catalyst, based on the weight of silicon dioxide, the content of the oxide of mangane...
Embodiment approach
[0031] According to a preferred embodiment, the preparation method comprises the following steps:
[0032] or
[0033]The cristobalite is respectively contacted with an aqueous solution of a soluble salt containing manganese and an aqueous solution containing sodium tungstate, and dried to obtain cristobalite impregnated with manganese and sodium tungstate;
[0034] (2) The cristobalite impregnated with manganese and sodium tungstate is brought into contact with a soluble brine solution containing ytterbium, followed by drying and firing.
[0035] In step (1), the carrier can be impregnated with the aqueous solution of the soluble salt containing manganese and sodium tungstate at the same time; the carrier can also be impregnated with the aqueous solution of the soluble salt containing manganese and the aqueous solution containing sodium tungstate . In the aqueous solution, the concentration of the soluble manganese salt can be, for example, 1-15% by weight, and the concentr...
Embodiment 1
[0055] Dissolve 10.73g of manganese nitrate solution in 50mL of water, add 33g of cristobalite, stir at room temperature for 1h, rotary evaporate at 80°C for 2h, and then dry at 120°C for 2h to obtain manganese-impregnated cristobalite.
[0056] Dissolve 0.037g of sodium tungstate dihydrate in 40mL of water, add cristobalite impregnated with manganese, stir at room temperature for 1 hour, rotary evaporate at 80°C for 2 hours, and then dry at 120°C for 2 hours to obtain cristobalite impregnated with manganese and sodium tungstate.
[0057] Dissolve 0.0075g of ytterbium nitrate pentahydrate in 20mL of water, add cristobalite impregnated with manganese and sodium tungstate, stir at 50°C for 1h, rotary evaporate at 80°C for 2h, then dry at 120°C for 2h, then dry in air at 5°C / min at a rate of 800°C for 5 h. After being cooled to room temperature, the obtained catalyst product is tabletted, pulverized, and sieved, and the part between 40-60 mesh is taken as catalyst A1 (Na 2 WO ...
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