【摘要】 采用共沉淀法制备了7.5%Ru/ZrO2·хH2O催化剂,运用N2物理吸附-脱附法、X射线衍射、X射线光电子能谱和高分辨透射电子显微镜等技术对催化剂进行了表征,并用于催化肉桂醛选择加氢制肉桂醇反应中,考察了温度、H2压力和溶剂对肉桂醛转化率和肉桂醇选择性的影响.结果表明,肉桂醛转化率随着温度或H2压力的升高而升高,而肉桂醇选择性则随之下降.该催化剂在极性溶剂中比在非极性溶剂中表现出更高的活性和肉桂醇选择性.尤其在极性溶剂三乙胺(Et3N)中反应活性最高,且具有较高的肉桂醇选择性.在Et3N中加入水可进一步提高反应活性和选择性.以V(Et3N)/V(H2O)=4的混合物为溶剂,在4MPa和70°C的优化条件下,反应6h,肉桂醛转化率为97.9%,肉桂醇选择性达85.2%.更多还原

【Abstract】 A heterogeneous supported catalyst 7.5%Ru/ZrO2·хH2O was prepared by co-precipitation method and characterized by N2 adsorp-tion-desorption,X-ray diffraction,X-ray photoelectron spectroscopy,and high resolution transmission electron microscopy. Its catalytic performance in cinnamaldehyde hydrogenation was investigated. The effects of temperature,hydrogen pressure,and solvent on the activity and selectivity for cinnamyl alcohol were tested. The results showed that the conversion of cinnamaldehyde increased with the increase in temperature and hydrogen pressure,but the product selectivity decreased. The catalyst showed better catalytic performance in a polar solvent than in a non-polar solvent. Using a mixture solvent composed of Et3N and H2O can remarkably raise the activity and the selectivity of the reaction. When the volume ratio of Et3N to H2O was 4,the temperature was 70 °C,and the reaction time was 6 h,the highest conversion(98.0%) and selectivity(85.2%) were obtained.更多还原