Supported copper-based single-atom catalyst and preparation method and use thereof
The present disclosure provides a supported copper-based single-atom catalyst and a preparation method and use thereof, belonging to the technical field of environmental catalysis. The preparation method includes the following steps: dispersing an organic ligand and a copper powder in acetonitrile, and conducting refluxing in a constant-temperature water bath to obtain a copper complex emulsion; conducting centrifugation and filtration on the copper complex emulsion in sequence to obtain a copper complex solution; mixing a support, the copper complex solution, and the acetonitrile, and conducting rotary evaporation on a resulting mixture to obtain a powder; and roasting the powder to obtain the supported copper-based single-atom catalyst. In the present disclosure, the copper powder is coordinated with the organic ligand and then supported on a surface of the support.
1 . A preparation method of a supported copper-based single-atom catalyst, comprising the following steps:
dispersing an organic ligand and a copper powder in acetonitrile, and subjecting a resulting dispersed system to refluxing in a constant-temperature water bath to obtain a copper complex emulsion;
conducting centrifugation and filtration on the copper complex emulsion in sequence to obtain a copper complex solution; and
mixing a support, the copper complex solution, and acetonitrile, and conducting rotary evaporation on a resulting mixture to obtain a powder; and roasting the powder to obtain the supported copper-based single-atom catalyst,
wherein the organic ligand is selected from the group consisting of 1,3-dimethylimidazolium chloride, 1,3-dimethylimidazolium iodide, and 1,3-dimethylimidazolium bromide;
the support is selected from the group consisting of titanium dioxide, cerium oxide, and boron nitride;
the roasting is conducted at 300° C.; and
the organic ligand and the copper powder are at a molar ratio of 1:10.
2 . The preparation method according to claim 1 , wherein the titanium dioxide is P25 titanium dioxide, the cerium oxide is nano-cerium oxide, and the boron nitride is hexagonal boron nitride.
3 . The preparation method according to claim 1 , wherein the roasting is conducted for 4 h.
4 . The preparation method according to claim 1 , wherein the refluxing in a constant-temperature water bath is conducted at 60° C. to 70° C. for 12 h to 16 h.
5 . A supported copper-based single-atom catalyst prepared by the preparation method according to claim 1 , comprising the support and copper single atoms supported on the support.
6 . The supported copper-based single-atom catalyst according to claim 5 , wherein the titanium dioxide is P25 titanium dioxide, the cerium oxide is nano-cerium oxide, and the boron nitride is hexagonal boron nitride.
7 . The supported copper-based single-atom catalyst according to claim 5 , wherein the roasting is conducted for 4 h.
8 . The supported copper-based single-atom catalyst according to claim 5 , wherein the refluxing in a constant-temperature water bath is conducted at 60° C. to 70° C. for 12 h to 16 h.
9 . The supported copper-based single-atom catalyst according to claim 5 , wherein based on a mass percentage of the supported copper-based single-atom catalyst being 100 wt %, the copper single atoms are in an amount of 1 wt % to 2.4 wt %.
10 . A use method of the supported copper-based single-atom catalyst according to claim 5 , comprising: in presence of the supported copper-based single-atom catalyst, conducting carbon monoxide oxidation between CO and O 2 at a temperature of 140° C. to 240° C.
11 . The use method according to claim 10 , wherein based on a mass percentage of the supported copper-based single-atom catalyst being 100 wt %, the copper single atoms are in an amount of 1 wt % to 2.4 wt %.