Catalyst for converting methane and preparation method and application thereof
A catalyst and methane technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problems of low catalytic activity and product selectivity, and achieve the promotion of methane Effects of oxidative coupling reaction, high catalytic activity, and high selectivity for C2+ hydrocarbons
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[0016] According to a second aspect of the present invention, the present invention provides a method for preparing a catalyst for converting methane, the method comprising: contacting a soluble salt of indium, a soluble salt of sodium tungstate and manganese with cristobalite in the presence of water , dried and calcined, so that the oxides of indium oxide, sodium tungstate and manganese are supported on the cristobalite.
[0017] In the preparation method of the present invention, cristobalite as a carrier has the characteristics of high-temperature structure and stable performance. The cristobalite can be purchased commercially, or can be obtained by roasting amorphous silicon dioxide.
[0018] In the preparation method of the present invention, the amount of the soluble salt of indium, sodium tungstate, manganese soluble salt and cristobalite is such that in the prepared catalyst, based on the weight of cristobalite, the content of indium oxide is 0.1-10 wt. %, the conten...
Embodiment approach
[0026] According to another specific embodiment, the preparation method of the catalyst comprises the following steps:
[0027] 1) In the presence of water, the aqueous solution of manganese-containing soluble salt and sodium tungstate is contacted with the cristobalite, and then dried to obtain cristobalite impregnated with manganese and sodium tungstate;
[0028]2) The cristobalite impregnated with manganese and sodium tungstate is brought into contact with a soluble salt solution of indium, followed by drying and firing.
[0029] In step 1), the cristobalite can be impregnated with an aqueous solution of a soluble salt of manganese and an aqueous solution of sodium tungstate, respectively, or can be impregnated with an aqueous solution of a soluble salt of manganese and sodium tungstate at the same time. The contacting is carried out under stirring, preferably at room temperature (20-45° C.) for 1-2 hours.
[0030] In step 2), the contacting is carried out under stirring, ...
Embodiment 1
[0047] Dissolve 5.86g of manganese nitrate solution in 32mL of water, add 15g of cristobalite carrier, stir at room temperature for 1h, rotate at 80°C for 4h, and dry at 120°C for 2h to obtain manganese-impregnated cristobalite. Dissolve 0.34g of sodium tungstate hydrate in 30mL of water, add cristobalite impregnated with manganese, stir at room temperature for 1h, rotate at 80°C for 2h, and dry at 130°C for 2h to obtain cristobalite impregnated with manganese and sodium tungstate. Dissolve 0.206 g of indium nitrate hydrate in 30 mL of water, add cristobalite impregnated with manganese and sodium tungstate, stir at 50 ° C for 1 h, rotate at 80 ° C for 3 h, dry at 120 ° C for 3 h, and then dry in air for 5 The rate of ℃ / min was raised to 800℃ for 5h. Cool to room temperature, obtain catalyst A1 (Na 2 WO 4 -Mn-In 2 o 3 / cristobalite), where, In 2 o 3 0.5%, Na 2 WO 4 2.0%, the oxide of Mn is 6.0% as Mn.
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