Spherical V-MCM-48 catalyst for hydrogen peroxide selective oxidation of phenylethylene oxide and method
A V-MCM-48, catalyst technology, applied in the field of hydrogen peroxide selective styrene oxide, to achieve the effect of changing distribution, high activity and low cost
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example 1
[0018] [Example 1] catalyst synthesis
[0019] 1.0125g of cetyltrimethylammonium bromide was dissolved in 69.1ml of deionized water, 24.2ml of ethanol and 6.3ml of ammonia (NH 3 In the mixed solution whose mass concentration is 27%), it is recorded as solution A. At the same time, 0.0108 g of ammonium metavanadate was dissolved in 10 ml of deionized water, which was recorded as solution B. Slowly add B to A, followed by 2.1 ml tetraethylorthosilicate. After stirring for 1 h, the obtained gel was put into a reactor for hydrothermal reaction at 100° C. for 24 h. The solid obtained after centrifugation was washed, dried, and calcined in a muffle furnace at 550° C. for 6 h to remove the surfactant, and the obtained catalyst was designated as C1. The XRD, SEM and low-temperature nitrogen adsorption diagrams of sample C1 are detailed in Figure 1 ~ Figure 3 , it can be seen from the XRD pattern that this sample has a narrow peak at 2θ of 211 and three small peaks at 2θ of 3.0-5....
example 2
[0020] [Example 2] Synthesis of Catalyst
[0021] Dissolve 0.3355g nonadecyltrimethylammonium chloride in 69.1ml deionized water, 49.3ml propanol and 6.3ml ammonia water (NH 3 In the mixed solution whose mass concentration is 27%), it is recorded as solution A. At the same time, 0.216 g of ammonium metavanadate was dissolved in 10 ml of deionized water, which was recorded as solution B. Slowly add B to A, followed by 2.1 ml tetraethylorthosilicate. After stirring for 2 hours, the obtained gel was put into a reactor for hydrothermal reaction at 40° C. for 24 hours. The solid obtained after centrifugation was washed, dried, and calcined in a muffle furnace at 500° C. for 5 h to remove the surfactant, and the obtained catalyst was designated as C2. The catalyst has a spherical shape, and the diameter of the sphere is 0.1-1 μm.
example 3
[0022] [Example 3] Synthesis of Catalyst
[0023] 0.7013g of octaalkyltrimethylammonium bromide was dissolved in 62.1ml of deionized water, 21.9ml of ethylene glycol and 4.5ml of ammonia (NH 3 In the mixed solution whose mass concentration is 30%), it is recorded as solution A. At the same time, 0.0432 g of ammonium metavanadate was dissolved in 10 ml of deionized water, which was recorded as solution B. Slowly add B to A, followed by 2.1 ml tetraethylorthosilicate. After stirring for 3 hours, the obtained gel was put into a reactor for hydrothermal reaction at 80° C. for 12 hours. The solid obtained after centrifugation was washed, dried, and calcined in a muffle furnace at 600° C. for 7 h to remove the surfactant, and the obtained catalyst was designated as C3. The catalyst has a spherical shape, and the diameter of the sphere is 0.1-1 μm.
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