CuO/TiO2 and CuO/N-TiO2 catalysts with 30% Cu loading were prepared by deposition-precipitation method using copper chloride as copper source, sodium hydroxide as precipitant, and TiO2 and N-TiO2 as supports. Combined with the characterization of N2 physical adsorption-desorption， X-ray diffraction(XRD), H2-temperature programmed reduction(H2-TPR), X-ray photoelectron spectroscopy (XPS) , CO Fourier transform infrared spectroscopy (CO-IR), and etc, the effects of N doping on the structure of TiO2 supported CuO catalyst and the catalytic performance of formaldehyde ethynylation were studied. The results show that N-doped TiO2 presented more Ti3+ species and oxygen vacant sites, which increased the interaction between CuO and the carrier and was conducive to the dispersion of CuO species. In the process of ethynylation, CuO is transformed into highly dispersed Cu+ active species in situ, and the catalyst shows high catalytic activity and stability.

formaldehyde ethynylation; CuO/N-TiO2 catalyst; Cu+ active species; Ti3+ species ; oxygen vacant sites