Catalyst for hydrogenation of dimethyl oxalate to prepare methyl glycolate, preparation method and application thereof
A technology of dimethyl oxalate and methyl glycolate, which is applied in the direction of carboxylate preparation, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve the difficulties of large-scale production, large pollution, Corrosion resistance and other problems, to achieve the effect of high catalyst activity and stability, simple preparation method and good synthesis repeatability
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[0018] Example 1
[0019] Dissolve copper nitrate or silver nitrate in deionized water; weigh urea according to the molar ratio of urea to nitrate ion in the metal solution of 2.1:1 and prepare it into an aqueous solution; add the urea solution to the mixed solution of copper nitrate and silver nitrate, Stir uniformly; add silica sol to the above mixed solution, and place it at 100~105℃ for 10 hours to uniformly precipitate to ensure complete decomposition of urea, and then age at 95℃ for 20 hours; filter with suction and rinse with deionized water The obtained sample was dried at 90°C for 24 hours; then calcined in a muffle furnace at 450°C for 5 hours; the non-oxygen element composition of the catalyst obtained after roasting was expressed as a percentage of 16%Cu-6%Ag / SiO 2 .
[0020] The catalyst prepared by the above calcination is pressed into a fixed-bed reactor after being pressed into a fixed bed reactor, and reduced with hydrogen at 300°C for 4 hours. After the reduction,...
Example
[0021] Examples 2~5
[0022] The composition of the catalyst in Examples 2 to 5 is the same as that of Example 1, which is 16%Cu-6%Ag / SiO 2 .
[0023] The preparation methods of the catalysts in Examples 2 to 5 are the same as in Example 1, except that the molar ratio of urea to nitrate ions is different from that in Example 1.
[0024] The reduction and reaction conditions of the catalyst in Examples 2 to 5 are also the same as in Example 1.
[0025] Among them, Table 1 shows the molar ratio of urea to nitrate ion and the reaction results in the preparation process of the catalyst in Examples 2-5.
[0026] Table 1
[0027] Example
Example
[0028] Examples 6-18
[0029] The preparation methods of the catalysts in Examples 6-18 are the same as those in Example 1, but the selected metal ions, the ratio of urea to metal ions, and the ratio of urea to nitrate ions are different, so the composition of the prepared catalyst (catalyst The composition of non-oxygen elements is expressed as a percentage).
[0030] The reduction and reaction conditions of the catalysts in Examples 6-18 are the same as in Example 1.
[0031] Table 2 shows the catalyst composition and reaction results of Examples 6-18.
[0032] Table 2
[0033] Example
[0034] It can be seen from Table 1 and Table 2 that the catalyst of the present invention can efficiently hydrogenate dimethyl oxalate into methyl glycolate, the conversion rate is as high as 94.5%, and the selectivity of the obtained methyl glycolate is as high as 92.5%.
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