A kind of catalyst for synthesizing dimethyl carbonate and its preparation method and application
A technology of dimethyl carbonate and catalyst, applied in the field of synthesizing dimethyl carbonate catalyst and preparation thereof, can solve the problems of difficult separation of homogeneous catalyst, low equilibrium conversion rate, etc., and achieves easy recovery and separation, simple preparation method, and improved product quality. quality effect
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example 1
[0023] (1) Take 38g of zinc nitrate, dissolve it in 42ml of distilled water, and stir evenly until the zinc nitrate is completely dissolved;
[0024] (2) Add n-butanol and ethyl orthosilicate to the solution in step (1), the molar ratio of n-butanol to ethyl orthosilicate added is 2.1; the molar ratio of water in the solution to ethyl orthosilicate added to 10, continue to stir evenly, drop nitric acid into the solution, and adjust the pH value of the solution to 3;
[0025] (3) Stir the solution in step (2) at 90°C for 3 hours until the solution turns into a gel, and then age at room temperature for 12 hours.
[0026] (4) The gel obtained in step (3) was dried at 100° C. for 10 h, and ground to obtain the final supported catalyst. The amount of active metal zinc is 15%, and the rest is SiO 2 .
[0027] Catalyst evaluation was carried out in an autoclave reactor, using urea and methanol as raw materials, including 15g of urea, 136g of methanol, 27g of catalyst mass, the rea...
example 2
[0029] (1) Take 30g of cerous nitrate, dissolve it in 45ml of distilled water, and stir evenly until the cerous nitrate is completely dissolved;
[0030] (2) Add n-butanol and tetraethyl orthosilicate to the solution in step (1), the molar ratio of n-butanol to tetraethyl orthosilicate is 3; the molar ratio of water in the solution to the added tetraethyl orthosilicate to 14, continue to stir evenly, drop nitric acid into the solution, and adjust the pH value of the solution to 4;
[0031] (3) The solution in step (2) was stirred at 80°C for 2 hours to convert the solution into a gel, and then aged at room temperature for 24 hours.
[0032] (4) The gel obtained in step (3) was dried at 100° C. for 12 hours, and ground to obtain the final supported catalyst. The amount of active metal cerium is 11%, and the rest is SiO 2 .
[0033] Catalyst evaluation was carried out in an autoclave reactor, using urea and methanol as raw materials, including 18g of urea, 116g of methanol, 1...
example 3
[0035] (1) Take 32g of cerous nitrate, dissolve it in 40ml of distilled water, and stir evenly until the cerous nitrate is completely dissolved;
[0036] (2) Add n-butanol and tetraethyl orthosilicate to the solution in step (1), the molar ratio of n-butanol to tetraethyl orthosilicate is 1.0; the molar ratio of water in the solution to the added tetraethyl orthosilicate to 9, continue to stir evenly, drop nitric acid into the solution, and adjust the pH value of the solution to 4;
[0037] (3) The solution in step (2) was stirred at 80°C for 2.5h to convert the solution into a gel, and then aged at room temperature for 16h.
[0038] (4) The gel obtained in step (3) was dried at 70° C. for 14 hours, and ground to obtain the final supported catalyst. The amount of active metal cerium is 8%, and the rest is SiO 2 .
[0039] Catalyst evaluation was carried out in an autoclave reactor, using urea and methanol as raw materials, including 15g of urea, 95g of methanol, 17g of cata...
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