A catalyst composition, its preparation method and the method of using it to prepare o-phenylphenol
A technology of ortho-phenylphenol and composition, which is applied in the field of catalytic hydrogenation of dibenzofuran to prepare ortho-phenylphenol, can solve problems such as unrealized industrialization, and achieve large-scale industrial production, easily available materials, and stable performance Effect
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Embodiment 1
[0039] Pre-prepared catalyst support γ-Al 2 o 3 : Sieve a certain amount of 40-60 mesh active Al 2 o 3 Granules were calcined in a muffle furnace at 550°C for 4 hours to obtain γ-Al 2 o 3 .
[0040] Preparation of Pt / γ-Al by Equal Volume Impregnation 2 o 3 Catalyst: First prepare an aqueous solution of chloroplatinic acid, dissolve 1.0 g of solid chloroplatinic acid with deionized water, set the volume in a 25 ml brown volumetric flask, and refrigerate for later use. Weigh 10g γ-Al 2 o 3 For the carrier, measure 13 ml of chloroplatinic acid aqueous solution (calculated based on the measured saturated water absorption of 1.3 ml / g) containing Pt element as an equivalent of 2% of the mass of the carrier as the impregnating solution. Add impregnation droplet to γ-Al 2 o 3 Carrier, soak overnight at room temperature.
[0041] Catalyst calcination and active material reduction: The impregnated catalyst was calcined in a muffle furnace at 450°C for 4 hours to obtain the f...
Embodiment 2
[0046] The selected carrier is θ-Al 2 o 3 , the preparation process is consistent with that of Example 1, except that the calcination temperature is different, which is 950° C. for 4 hours.
[0047] The catalyst also adopts the same volume impregnation method to load the active components, except for the specific content, the impregnation process is the same as that of Example 1.
[0048] Catalyst finalization adopts roasting method, is consistent with embodiment 1, finally makes 2%Pt / θ-Al 2 o 3 catalyst composition.
[0049] The evaluation experiment adopted the same evaluation method and conditions as in Example 1, and the results were obtained: the average conversion rate of DBF was 82.42%, and the average selectivity of OPP was 48.39%. The main by-products are still dicyclohexyl, cyclohexylbenzene, biphenyl and 1,2,3,4-tetrahydrodibenzofuran, but the content of by-products is lower than that in Example 1. In addition to by-products, a small amount of 2-cyclohexylpheno...
Embodiment 3
[0051] Also use θ-Al 2 o 3 As a catalyst carrier, the preparation process is consistent with Example 2.
[0052] The active component of the catalyst is metal Pd, and the same volume impregnation method is used to support metal Pd equivalent to 2% equivalent of the carrier mass. The impregnation process is the same as in Example 2 except that palladium chloride is dissolved in concentrated hydrochloric acid and the specific content is different.
[0053] Catalyst finalization adopts roasting method, is consistent with embodiment 1, makes 2%Pd / θ-Al 2 o 3 catalyst composition.
[0054] Evaluation experiment:
[0055] The evaluation experiment adopts the same evaluation method as that of Example 1, except that the reduction condition is 300° C. and 80 ml / min of hydrogen flow for 3 hours, and other conditions are the same as that of Example 1.
[0056] Using the same evaluation method as in Example 1, the results obtained showed that the average conversion rate of DBF was 71....
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