Non-noble metal light alkane dehydrogenation catalyst with spherical three-mesoporous composite material as carrier, preparation method and application thereof
A dehydrogenation catalyst and non-precious metal technology, which is applied in the direction of metal/metal oxide/metal hydroxide catalyst, carbon compound catalyst, catalyst activation/preparation, etc., can solve the problems of high cost and environmental pollution, and reduce the cost of preparation , high selectivity and good catalyst stability
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[0042] According to the method for preparing non-precious metal-based low-carbon alkane dehydrogenation catalysts provided by the present invention, in step (b), the conditions for the contact of the water glass with the inorganic acid may include: the temperature may be 10-60° C., preferably 20-60° C. 40°C; the time can be 1-5 hours, preferably 1.5-3 hours, and the pH value is 2-4. In order to be more conducive to the uniform mixing between the various substances, the contact between the water glass and the inorganic acid is preferably carried out under stirring conditions.
[0043] According to the present invention, the water glass is an aqueous solution of sodium silicate conventional in the art, and its concentration may be 10-50% by weight, preferably 12-30% by weight.
[0044] According to the present invention, the inorganic acid may be one or more of sulfuric acid, nitric acid and hydrochloric acid. The mineral acids can be used in pure form or in the form of their a...
Embodiment 1
[0078] This example is used to illustrate the non-precious metal-based low-carbon alkane dehydrogenation catalyst and its preparation method.
[0079] (1) Preparation of spherical three-mesoporous composite carrier
[0080] Add 1g (0.0002mol) of triblock copolymer surfactant P123 and 1.69g (0.037mol) of ethanol to 28ml of acetic acid and sodium acetate buffer solution with a pH value of 4, and stir at 15°C until P123 is completely dissolved. Add 6g (0.053mol) trimethylpentane to the obtained solution afterwards, stir at 15°C for 8h, then add 2.13g (0.014mol) tetramethoxysilane to it, at 15°C, the pH value is 4.5 Stirred under conditions for 20h, then transferred the obtained solution to a polytetrafluoroethylene-lined reactor, crystallized at 60°C for 24h, then filtered and washed 4 times with deionized water, and then suction filtered to obtain a one-dimensional Filter cake A1 of No. 1 mesoporous molecular sieve material with hexagonal single-pore distribution structure;
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Embodiment 2
[0097] This example is used to illustrate the non-precious metal-based low-carbon alkane dehydrogenation catalyst and its preparation method.
[0098] (1) Preparation of spherical three-mesoporous composite carrier
[0099] Add 1g (0.0002mol) of triblock copolymer surfactant P123 and 1.84g (0.04mol) of ethanol to 28ml of acetic acid and sodium acetate buffer solution with a pH value of 5, and stir at 15°C until P123 is completely dissolved. Then add 9.12g (0.08mol) trimethylpentane to the resulting solution, stir at 15°C for 8h, then add 3.04g (0.02mol) tetramethoxysilane to it, at 25°C, pH value is 5.5 Stirring for 15h under the condition of , then transferring the obtained solution to a polytetrafluoroethylene-lined reactor, crystallizing at 100°C for 10h, then filtering and washing with deionized water for 4 times, and then suction filtering to obtain a No. 1 mesoporous molecular sieve material filter cake A3 with a single-pore distribution structure of six-dimensional hex...
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