Preparation Of Cu-based Catalysts And Study On Selective Hydrogenation Of Furfural

Furfuralcohol alcohol is an important organic chemical material.Traditional catalysts for furfural hydrogenation to synthetize furfuralcohol process contain Cr material are harmful to human health and cause environmental pollution.In addition,most of the domestic furfuralcohol productions adopt the expensive imported catalyst.Therefore,studying and developing the domestic efficient catalyst without Cr used in the furfural hydrogenation to synthetize furfuralcohol process is very importance for realism.In this paper,Cu was chosen as the active phase,and the supported Cu catalysts,Cu/Al₂O₃-ZrO₂ and Cu/TiO₂-SiO₂ were prepared.The catalysts were characterized by X-ray diffraction（XRD）,N2-adsoption specific surface are measurements（BET）,temperature programmed reduction with H₂（H₂-TPR）,X-ray photoelectron（XPS）and standard electronic modules（SEM）to investigate the selective hydrogenation peformances of furfuralcohol.Compared with the Cu/SiO₂ catalysts,the Cu/TiO₂-SiO₂ catalysts with a TiO₂ mass fraction of 40%can restrain the increasing of Cu particles and impove the disperstiveness of Cu particles.By increasing the mass fraction of Cu in the Cu/TiO₂-SiO₂ catalysts,on one hand,the catalysts hydrogenation activity will increase.On the other hand,it is beneficial to deep hydrogenation reactions and thus leads the selectivity decline.Compared with the Cu/Al₂O₃ catalysts,because of the exsitance of ZrO₂,the interactions in the Cu/Al₂O₃-ZrO₂ catalysts between CuO and Al₂O₃ decrease and thus leads the deep hydrogenation performances of supported Cu catalysts decrease,however,the selectivity increases.In the carrier Al₂O₃-ZrO₂,the existence of ZrO₂ help the delay of the crystallization,avoiding active component Cu embedded in the four winds crystalling phase,thus decrease the catalytic activity.