硅藻土铜铋基催化剂炔醛化反应合成1,4-丁炔二醇的研究

Synthesis of 1,4-butynediol via ethynylation of formaldehyde over Cu/Bi/kieselguhr catalyst

利用浸渍法及固相研磨法制备了以硅藻土为载体的铜铋基催化剂,并在常压进行炔醛化反应合成1,4-丁炔二醇。对制备的催化剂进行XRD、H_(2)-TPR、SEM、TEM及氮气低温吸附脱附等表征分析。结果表明,固相研磨法制备的铜铋基催化剂拥有最好的催化活性,常压反应7 h甲醛的转化率为70%,1,4-丁炔二醇的选择性为86%,与商业催化剂的活性相当。这主要归因于该催化剂比表面积较大、氧化铜颗粒较小(12 nm),氧化铜能够在硅藻土表面及孔洞内较均匀分散,具有较多的活性中心。

Cu-Bi based catalysts loaded on kieselguhr are prepared by impregnation and solid grinding methods,respectively,and applied in the ethynylation of formaldehyde for synthesis of 1,4-butynediol.These catalyst samples are characterized by XRD,H_(2)-TPR,SEM,TEM,N_(2) adsorption/desorption.It is found that Cu-Bi based catalyst prepared by solid grinding method exhibits the higher catalytic activity,over which the conversion of formaldehyde can reach 70% and the selectivity of 1,4-butynediol achieves 86% after the reaction has performed for 7 h under atmospheric pressure.The performance is equivalent to that of commercial catalyst.It is attributed to the catalysts with the bigger surface area,smaller Cu O particles size and Cu O well dispersed in kieselguhr,forming more active centers.