Supported copper-based single-atom catalyst and preparation method and use thereof

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.