Catalyst and preparation method for hydrogenation of oxalate to ethanol
A technology of catalyst and oxalate, which is applied in chemical instruments and methods, preparation of hydroxyl compounds, preparation of organic compounds, etc., can solve the problems that have not yet been applied on a large scale, the selectivity of ethanol is reduced, and the stability of the catalyst is poor, so as to achieve excellent stability Enhancement of sex, selectivity, and effect of reducing alkalinity
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Embodiment 1
[0044] Catalyst preparation
[0045] Weigh 15.40 g of copper nitrate trihydrate into a three-necked flask, add 150 ml of deionized water, and stir in a constant temperature water bath until the copper nitrate is completely dissolved. Slowly add 52ml of ammonia water dropwise into the solution, stir evenly, then add 50ml of deionized water, seal it, adjust to 4th gear and stir for 30 minutes. After stirring evenly, 45ml of silica sol was added dropwise to the solution, and aged for 4 hours under stirring. Then heat up to 80°C and vacuumize to 0.04MPa to evaporate the excess ammonia water to precipitate copper and silicon oxide. The precipitate was filtered and washed 3 times with deionized water. After drying the filtrate at 100° C. for 10 hours, it was baked at 450° C. for 4 hours. The final formation of Cu / SiO with a copper content of 20wt% 2 Catalyst ready for use.
[0046] Sieve the prepared catalyst tablet into 40-60 mesh, then weigh 0.5gCu / SiO 2 Catalyst is loaded i...
Embodiment 2
[0048] Catalyst preparation
[0049] Weigh 15.40 g of copper nitrate trihydrate into a three-necked flask, add 150 ml of deionized water, and stir in a constant temperature water bath until the copper nitrate is completely dissolved. Slowly add 52ml of ammonia water dropwise into the solution, stir evenly, then add 50ml of deionized water, seal it, adjust to 4th gear and stir for 30 minutes. After stirring evenly, 45ml of silica sol was added dropwise to the solution, and aged for 4 hours under stirring. Then heat up to 80°C and vacuumize to 0.02MPa to evaporate excess ammonia water to precipitate copper and silicon oxide. The precipitate was filtered and washed with deionized water 3 times. After drying the filtrate at 100° C. for 10 hours, it was baked at 450° C. for 4 hours. The final formation of Cu / SiO with a copper content of 20wt% 2 Catalyst ready for use.
[0050] Sieve the prepared catalyst tablet into 40-60 mesh, then weigh 0.5gCu / SiO 2 Catalyst is loaded into ...
Embodiment 3
[0052] Catalyst preparation
[0053] Weigh 15.40 g of copper nitrate trihydrate and 12.03 g of aluminum nitrate hexahydrate into a three-necked flask, add 150 ml of deionized water, and stir in a constant temperature water bath until the copper nitrate is completely dissolved. Slowly add 52ml of ammonia water dropwise into the solution, stir evenly, then add 50ml of deionized water, seal it, adjust to 4th gear and stir for 30 minutes. After stirring evenly, 45ml of silica sol was added dropwise to the solution, and aged for 4 hours under stirring. Then raise the temperature to 80°C and vacuumize to 0.04MPa to evaporate excess ammonia water and precipitate copper, aluminum and silicon oxide. The precipitate was filtered and washed 3 times with deionized water. After drying the filtrate at 100° C. for 10 hours, it was baked at 450° C. for 4 hours. Finally, a Cu / SiO2-0.5Al catalyst with a copper content of 20 wt % and an aluminum content of 0.5 wt % is formed for use.
[0054...
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