| Abstrakt: |
A Cu-based catalyst has been widely used in ethynylation of formaldehyde for synthesis of 1,4-butynediol. Herein, bismuth, magnesium, and manganese species were separately doped into Cu-based catalysts by a co-precipitation method and applied in ethynylation reaction. All catalysts were characterized through X-ray diffraction (XRD), Transmission electron microscope (TEM), H2temperature-programmed reduction (H2-TPR), scanning electron microscopy (SEM) and elements mapping, Fourier transform infrared spectroscopy (FT-IR), Raman spectroscopy and X-ray photoelectron spectroscopy (XPS). The results show that Mn-doped Cu-based catalysts exhibit the best yield of 1,4-butynediol (65%). It is mainly due to CuO in CuO/MnOxcatalysts with smaller particle size, better dispersibility and the electronic synergy between copper and manganese species. Moreover, CuO/MnOx-15 catalysts prepared by optimized conditions can further improve the yield and selectivity of 1,4-butynediol to 76% and 96% and remain selectivity of 1,4-butynediol unchanged in about 50 h, which is higher than that of the commercial catalyst (yield of 62%, selectivity of 90%). |
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