Columbium oxide catalyst for hydrating epoxy ethane to prepare ethandiol
A technology of ethylene oxide hydration and ethylene glycol, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, hydroxyl addition preparations, etc., can solve the problem that stability and activity cannot be balanced at the same time. , high production cost, environmental pollution and other problems, to achieve the effect of excellent reaction performance, high selectivity, and no pollution to the environment
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Embodiment 1
[0030] Mix TEOS (tetraethyl orthosilicate) and titanium oxide sol according to a certain ratio, add 5% polyvinyl alcohol aqueous solution and stir evenly. The niobium isopropoxide solution was added to the above solution, vigorously stirred for 30 minutes, and then allowed to stand at 60° C. until a gel was formed. It was left at room temperature for 48 hours, aged at 80°C for 16 hours, dried at 120°C for 4 hours, and calcined in an oxygen atmosphere at 500°C for 8 hours to obtain catalyst A. The composition of the catalyst is shown in Table 1.
Embodiment 2
[0032] Fully mix 15 grams of niobium phenolate, 70 grams of silicon dioxide and 30 grams of zirconium dioxide in a kneader, then add 60 milliliters of dilute nitric acid with a weight concentration of 1%, knead to form a lump material, extrude into a strip, and heat at 700 ° C in the air Calcined for 4 hours to obtain catalyst B. The catalyst composition is shown in Table 1.
Embodiment 3
[0034] Dissolve the niobium amine complex in water to make a solution with a concentration of 0.12 g / ml, impregnate the Ti-HMS molecular sieve with the solution, the volume ratio of the impregnation liquid to solid is 2.5:1, the impregnation time is 2 hours, filter the solution, and filter the solution at 120 °C for 2 hours, and then calcined for 4 hours in an ammonia atmosphere at 600 °C to obtain catalyst C. The catalyst composition is shown in Table 1.
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