A hydrogenation catalyst, its preparation method and application, and a method for hydrogenation reaction of phenols
A hydrogenation catalyst and hydrogenation reaction technology, applied in hydrogenation preparation, dehydrogenation preparation, metal/metal oxide/metal hydroxide catalyst, etc., can solve the problems of large hydrogen consumption and low catalyst efficiency, and achieve high Catalytic activity, effect of high feedstock conversion
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[0035] According to a second aspect of the present invention, the present invention provides a method for preparing the hydrogenation catalyst, the method comprising:
[0036] (1) Preparation of modified carrier: In the presence of an inert solvent, the amino group-containing organosilylating agent is brought into contact with the carrier to functionalize the carrier (usually amino groups are introduced via silicon-oxygen bonds on the carrier) to obtain the The modified carrier;
[0037] (2) Impregnation: impregnating the modified carrier with an impregnation solution containing the compound of the active component to obtain a catalyst precursor;
[0038](3) Reduction: contacting the catalyst precursor with a reducing agent to reduce the compound containing the active component to obtain the hydrogenation catalyst.
[0039] In step (1), the functionalization can be carried out in the following manner: after mixing the carrier, the amino group-containing organosilylating agent...
Embodiment 1
[0102] What the present embodiment prepared was Pd / C hydrogenation catalyst (containing 0.4% by weight of Pd), and the preparation method included:
[0103] (1) Add the strip-shaped activated carbon carrier into absolute ethanol to obtain a mixed solution, and slowly add aminopropyltriethoxysilane (the mass of aminopropyltriethoxysilane and activated carbon carrier) at 70°C under stirring conditions The ratio is 1:5), refluxed for 12h, and then cooled to room temperature, the solid matter was separated, washed with absolute ethanol, and dried at 80°C for 8h to obtain a modified carrier;
[0104] (2) PdCl 2 Prepare an impregnation solution with absolute ethanol, place the modified carrier in the impregnation solution, stir and reflux at 80°C for 20h, then cool to room temperature, separate the solid matter, wash with absolute ethanol, and dry at 80°C for 4h , to obtain the catalyst precursor;
[0105] (3) Place the catalyst precursor in an aqueous solution of hydrazine hydrat...
Embodiment 2-7
[0107] The hydrogenation catalyst was prepared by the same method as in Example 1, except that the composition of the impregnating solution and / or the type of carrier was changed accordingly to obtain the hydrogenation catalyst. The serial numbers and specific compositions of the catalysts are shown in Table 1.
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