Catalyst used for preparing hydroxy acetone by glycerol dewatering, preparation and application thereof
The technology of hydroxyacetone and catalyst is applied in the field of metal additives modified copper chromite catalyst, which can solve the problems of insufficient stability, coking and deactivation, etc., and achieve the effects of prolonging the service life, improving the activity and reducing the reaction temperature.
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Embodiment 2
[0021] Weigh 5.4 g of copper chromite powder and 0.62 g of zirconia, dissolve the zirconia in 30 ml of ethanol, add copper chromite powder, adjust the pH value to 6.0 with a volume ratio (the same below) of 1:1 nitric acid solution, and ultrasonicate for 60 Minutes, stirred at a constant temperature of 50°C for 3 hours, filtered, washed with deionized water until the pH was neutral, then placed in an oven and dried at a constant temperature of 120°C for 4 hours, taken out and ground, placed in a tube furnace for calcination at 350°C for 3 hours , to obtain the desired zirconium-modified copper chromite catalyst sample.
[0022] Take a three-necked flask with a capacity of 125ml, connect it to a cooling water circulation device, heat it through a silicone oil bath, and keep the temperature at 220°C. Use a circulating water-type multi-purpose vacuum pump to depressurize it. In the reactor, weigh 1.5g of the above-mentioned catalyst, First heat the catalyst to the reaction temper...
Embodiment 3
[0024] Weigh 5.4g copper chromite powder, 2.2g zinc nitrate hexahydrate, dissolve zinc nitrate with 30ml ethanol, add copper chromite powder, adjust pH value to 6.0 with 1:1 nitric acid solution, ultrasonic for 60 minutes, constant temperature 50 Stir at ℃ for 3 hours, filter, wash with deionized water until the pH is neutral, place and dry in an oven at a constant temperature of 120°C for 4 hours, take it out and grind it, and place it in a tube furnace for calcination at 350°C for 3 hours to obtain the obtained The desired zinc-modified copper chromite catalyst samples.
[0025] Take a three-necked flask with a capacity of 125ml, connect it to a cooling water circulation device, heat it through a silicone oil bath, and keep the temperature at 220°C. Use a circulating water-type multi-purpose vacuum pump to depressurize it. In the reactor, weigh 1.5g of the above-mentioned catalyst, First heat the catalyst to the reaction temperature, then immediately pour 30g of 70% glycerol...
Embodiment 4
[0027] Weigh 5.4g of copper chromite powder and 0.62g of titanium oxide, dissolve titanium oxide with 30ml of ethanol, add copper chromite powder, adjust the pH value to 6.0 with 1:1 nitric acid solution, ultrasonic for 60 minutes, and stir at a constant temperature of 50°C After 3 hours, filter, wash with deionized water until the pH is neutral, place it in an oven and dry at a constant temperature of 120°C for 4 hours, take it out and grind it, and place it in a tube furnace for calcination at 350°C for 3 hours to obtain the desired Titanium-modified copper chromite catalyst samples.
[0028]Take a three-necked flask with a capacity of 125ml, connect it to a cooling water circulation device, heat it through a silicone oil bath, and keep the temperature at 220°C. Use a circulating water-type multi-purpose vacuum pump to depressurize it. In the reactor, weigh 1.5g of the above-mentioned catalyst, First heat the catalyst to the reaction temperature, then immediately pour 30g of...
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