MgO促进Cu/SiO2催化乙酰丙酸乙酯合成γ-戊内酯

Synthesis of γ-valerolactone from ethyl levulinate over Mg-modified Cu/SiO2catalyst

采用蒸氨法制备了Cu/SiO2和Cu-Mg/SiO2催化剂。采用X射线衍射(XRD)、N2吸附-脱附(BET)、N2O滴定、红外光谱(IR)、H2-程序升温还原(H2-TPR)、NH3-程序升温脱附(NH3-TPD)技术对催化剂的物理化学结构进行了表征,考察了其乙酰丙酸乙酯(EL)加氢合成γ-戊内酯性能。结果表明,与Cu/SiO2相比,加入MgO助剂可以提高催化剂的酸强度、酸量以及Cu物种的分散度,提高了乙酰丙酸乙酯转化率和γ-戊内酯选择性。

Cu/SiO2 and Cu-Mg/SiO2 catalysts were prepared by ammonia-evaporation method and the physical and chemical properties were characterized by XRD, N2 adsorption-desorption, N2O titration, IR, H2-TPR and NH3-TPD. The catalytic performances of Cu-based catalyst prepared for hydrogenation of ethyl levulinate to γ-valerolactone were investigated. The results showed that,compared with Cu/SiO2, the addition of MgO could improve the amount of acid, the acidity strength and the Cu dispersion, resulting in the increase of ethyl levulinate conversion and γ-valerolactone selectivity.