Method for preparing o-phenylphenol by direct catalytic hydrogenation of dibenzofuran
A technology for the catalytic hydrogenation of o-phenylphenol, applied in the direction of catalyst activation/preparation, chemical instruments and methods, and the preparation of organic compounds, can solve the large-scale preparation of o-phenylphenol, which cannot be recycled repeatedly, and the utilization of raw materials Insufficient problems, to achieve the effect of improving activity and service life, easy separation and reuse, and high selectivity
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Embodiment 1
[0027] Example 1 A preparation method of a modified catalyst for preparing o-phenylphenol by direct catalytic hydrogenation of oxyfluorene
[0028] A method for preparing a modified catalyst for o-phenylphenol by direct catalytic hydrogenation of oxyfluorene, comprising the steps of:
[0029] (1) Catalyst carrier pretreatment: make the specific surface area 200m 2 50g of spherical γ-alumina / g was dried in a constant temperature blast drying oven at 120°C for 4 hours, and then cooled to room temperature;
[0030] (2) Equal volume impregnation: Dissolve 1 g of citric acid and 0.66 g of chloroplatinic acid in 45 g of deionized water to prepare an impregnation solution, slowly pour the impregnation solution into the catalyst carrier that has been dried and cooled to room temperature for equal volume impregnation, and stir After uniformity, put it in the air for 3 hours, put the soaked carrier in a constant temperature blast drying oven at 120°C for 8 hours, and then take it out; ...
Embodiment 2
[0034] Example 2 A preparation method of a modified catalyst for preparing o-phenylphenol by direct catalytic hydrogenation of oxyfluorene
[0035]A method for preparing a modified catalyst for o-phenylphenol by direct catalytic hydrogenation of oxyfluorene, comprising the steps of:
[0036] (1) Catalyst carrier pretreatment: set the specific surface area to 200m 2 50g of spherical γ-alumina / g was dried in a constant temperature blast drying oven at 120°C for 4 hours and then cooled to room temperature;
[0037] (2) Equal-volume impregnation: Dissolve 2.3g of oxalic acid and 1.97g of chloroplatinic acid in 45g of deionized water to prepare an impregnation solution, slowly pour the impregnation solution into the catalyst carrier that has been dried and cooled to room temperature for equal-volume impregnation, and stir evenly After immersing in the air for 2 hours, put the impregnated catalyst carrier in a constant temperature blast drying oven at 120°C for 9 hours and then tak...
Embodiment 3
[0041] Example 3 A preparation method of a modified catalyst for preparing o-phenylphenol by direct catalytic hydrogenation of oxyfluorene
[0042] A method for preparing a modified catalyst for o-phenylphenol by direct catalytic hydrogenation of oxyfluorene, comprising the steps of:
[0043] (1) Catalyst carrier pretreatment: set the specific surface area to 280m 2 50g spherical magnesium oxide / g was placed in a constant temperature blast drying oven at 120°C for 4 hours, then cooled to room temperature;
[0044] (2) Equal-volume impregnation: Dissolve 1.5g of nitric acid and 1.02g of palladium nitrate in 54g of deionized water to prepare an impregnation solution, slowly pour the impregnation solution into the catalyst carrier that has been dried and cooled to room temperature for equal-volume impregnation, and stir evenly Immerse in air for 2 hours, put the impregnated catalyst carrier in a constant temperature blast drying oven at 120°C for 8.5 hours and then take it out; ...
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