Preparation method of propylene oxygen gaseous epoxy catalyst
An epoxidation and catalyst technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, molecular sieve catalysts, etc., can solve the problem of reducing the selectivity of target products, easily attacking allyl hydrogen, Uneven distribution of acidity on catalyst surface
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Embodiment 1
[0018] Example 1: Weigh about 0.25 g of cetyltrimethylammonium bromide and add it to 30 mL of deionized water and stir in an ice-water bath; after CTAB is dissolved, slowly add 5.2 g of orthosilicon dropwise into the solution acid tetraethyl ester, stirred to obtain solution A; according to the molar ratio of silicon to bismuth as 50, a certain amount of bismuth nitrate pentahydrate was dissolved in 50% aqueous glycerin solution to obtain solution B; solution B was slowly added dropwise to solution A, and stirred , according to the molar ratio Co / Bi=0.1, take cobalt acetate and dissolve it in 5mL ethanol to obtain solution D; add solution D dropwise to solution C to obtain solution E, and then transfer it to a high-pressure reactor with polytetrafluoroethylene, at 110 Crystallization at ℃ for 12 h; after the reaction kettle dropped to room temperature under natural conditions, the gel was taken out, centrifuged and washed three times, and dried overnight at 383 K; the obtained ...
Embodiment 2
[0022] Example 2: As in the catalyst system of Example 1, during the synthesis of the carrier, take cobalt acetate and dissolve it in 5 mL of ethanol at a molar ratio of Co / Bi=0.2 to obtain solution D; add solution D dropwise to solution C to obtain solution E , and then transferred to a high-pressure reactor with polytetrafluoroethylene, and crystallized at 120 ° C for 12 h; other conditions were consistent with Example 1, and the activity evaluation conditions were as in Example 1.
Embodiment 3
[0023]Embodiment 3: as the catalyst system of embodiment 1, the molybdenum precursor used is molybdenum acid, and the bismuth precursor is bismuth subcarbonate, is 30 by silicon-bismuth mol ratio, and the amount of substance of the precursor used is all the same as that of embodiment 1 Similarly, in the process of synthesizing the carrier, according to the molar ratio Co / Bi=0.1, take cobalt acetate and dissolve it in 7mL ethanol to obtain solution D; add solution D dropwise to solution C to obtain solution E, and then transfer to a high-pressure tank with polytetrafluoroethylene In the reaction kettle, crystallize at 90°C for 15 h; the weak acid is 25ml of 0.01 mol / L citric acid, other conditions are consistent with Example 1, the activity evaluation conditions are as in Example 1, and the catalytic reaction results are shown in Table 1.
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