The influence of N doping on TiO2 supported Cu-based catalyst for formaldehyde ethynylation
CuO/TiO2and CuO/N-TiO2catalysts with 30％Cu loading were prepared by deposition-precipitation method using copper chloride as copper source, sodium hydroxide as precipitant, and TiO2and N-TiO2as 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 TiO2supported CuO catalyst and the catalytic performance of formaldehyde ethynylation were studied.The results show that N-doped TiO2presented more Ti 3+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 ethynylationCuO/N-TiO2 catalystCu+ active speciesTi3+ speciesoxygen vacant sites
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