Cobalt-based catalyst as well as preparation method and application thereof to synthesis of 3-hydroxycarboxylate
A cobalt-based catalyst, hydroxycarboxylate technology, applied in catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of difficult preservation, easy decomposition of catalysts, etc. The effect of easy separation, recovery and recycling, and simple preparation method
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[0042] Another aspect of the embodiments of the present invention provides a method for preparing a cobalt-based catalyst, which includes:
[0043] Make the mixed reaction system containing cobalt source, carbon-nitrogen precursor and solvent react at 25-80°C for 0.5-2h, add porous material, and then bake at 550-900°C for 2-3h in a protective atmosphere to obtain cobalt-based catalyst.
[0044]Further, the preparation method may include: mixing and dissolving the cobalt source and the carbon-nitrogen precursor in ethanol, heating and stirring, then adding the porous material and continuing to stir, after the ethanol is evaporated to dryness, grind it into fine powder and put it into an atmosphere furnace for roasting.
[0045] In some embodiments, the preparation method specifically includes:
[0046] (1) Uniformly mix the cobalt source and the solvent to form a cobalt source solution, then add the carbon-nitrogen precursor, make the obtained mixed reaction system react at 25...
Embodiment 1
[0087] The preparation method of the cobalt-based catalyst of the present embodiment is as follows:
[0088] Weigh 1.268g Co(OAc) 2 4H 2 O was dissolved in 200ml of ethanol, then 1.82g of 1,10-phenanthroline was added, heated to 60°C and kept at a constant temperature for 1 hour, after cooling down, 6.91g of silicon dioxide was added and stirred for 16 hours. The prepared mixed system was evaporated to dryness with a rotary evaporator, and then the solid phase part was continued to be vacuum-dried at 60 °C, ground and then roasted at 800 °C for 2 hours in an Ar atmosphere to obtain a cobalt-based catalyst (named as catalyst 1).
Embodiment 2
[0090] The preparation method of this example is basically the same as that of Example 1, except that 1,10-phenanthroline in Example 1 is replaced with 0.68 g of imidazole, and the temperature is raised to 25° C. and kept at a constant temperature for 2 hours. The cobalt-based catalyst prepared in this example is named catalyst 2.
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