Molybdenum carbide supported monatomic hydrogenation catalyst, preparation method thereof and application thereof in alkyne semi-hydrogenation
A hydrogenation catalyst and atomic chemistry technology, applied in the field of hydrogenation, can solve problems such as selectivity reduction, and achieve the effects of increased selectivity, high activity and strong stability
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[0044] In another aspect of the present invention, the present invention provides a kind of preparation method of aforementioned hydrogenation catalyst, comprising:
[0045] Loading a metal single atom on a carrier, wherein the carrier includes MoC, and the metal single atom is chemically bonded to the molybdenum atom in the MoC;
[0046] Wherein, the metal single atom includes at least one of single-atom nickel, single-atom cobalt and single-atom copper.
[0047] In some embodiments of the present invention, the preparation method includes:
[0048] Mix citric acid with metal salt to obtain chelate;
[0049] The solid obtained after mixing the chelate compound with the carrier is calcined in a reducing atmosphere to obtain the hydrogenation catalyst.
[0050] Under the action of the organic molecule citric acid, the metal single atom will form a bond with the Mo atom exposed on the surface of MoC to form a metal single atom with metal characteristics, and then the metal sin...
Embodiment 1
[0070] The preparation method of hydrogenation catalyst is as follows:
[0071] 1. The preparation of carrier α-MoC: using ammonium molybdate as the precursor, place it in the atmosphere furnace, replace it with inert gas, and then pass it into NH 3 , at a heating rate of 5°C / min to 700°C and baked for 2 hours, followed by inert gas replacement; then CH 4 , heating up to 1200°C at a heating rate of 5°C / min and roasting for 2 hours, then cooling to room temperature to obtain α-MoC;
[0072] 2. Using α-MoC as a carrier, mix it with nickel nitrate and citric acid chelate aqueous solution at room temperature, then wash and centrifuge to obtain a uniformly mixed solid, in which the molar ratio of citric acid to nickel nitrate is 2:1, nitric acid The mass ratio of nickel element to α-MoC in nickel is 0.5%:1;
[0073] 3. Calcining the solid obtained in step 2 at 300° C. for 2 hours in a hydrogen atmosphere to obtain a hydrogenation catalyst.
Embodiment 2
[0075] The preparation method of hydrogenation catalyst is as follows:
[0076] 1. The preparation of carrier α-MoC: using ammonium molybdate as the precursor, place it in the atmosphere furnace, replace it with inert gas, and then pass it into NH 3 , at a heating rate of 5°C / min to 700°C and baked for 2 hours, followed by inert gas replacement; then CH 4 , heating up to 1200°C at a heating rate of 5°C / min and roasting for 2 hours, then cooling to room temperature to obtain α-MoC;
[0077] 2. Using α-MoC as a carrier, mix it with nickel nitrate and citric acid chelate aqueous solution at room temperature, and then wash and centrifuge to obtain a uniformly mixed solid, wherein the molar ratio of citric acid to nickel nitrate is 3:1, and nitric acid The mass ratio of nickel element to α-MoC in nickel is 0.5%:1;
[0078] 3. Calcining the solid obtained in step 2 at 300° C. for 2 hours in a hydrogen atmosphere to obtain a hydrogenation catalyst.
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