【摘要】 糠醇是重要的有机化工原料,用途广泛。现行糠醛催化加氢制备糠醇的技术存在氢耗大、成本高等缺点。本文提出了一种在近临界异丙醇中,Cu-Pd/Al₂O₃催化糠醛转移氢化制备糠醇的方法。采用共沉淀法制备了不同Cu、Pd负载量的Cu-Pd/Al₂O₃催化剂,并进行了XRD、氮气吸脱附表征。考察了催化剂中Cu-Pd的负载量、催化剂用量、糠醛浓度、反应温度和反应时间对反应的影响。结果表明:18%Cu-2%Pd/Al₂O₃双金属催化剂对糠醛催化转移氢化反应效果最好;在18%Cu-2%Pd/Al₂O₃催化剂作用下,反应温度为190℃、反应时间为3h时,糠醛转化率为100%、糠醇收率达到86.4%;催化剂重复使用四次后依然保持良好的活性。本文提出的方法具有非临氢、糠醇收率高、催化剂重复使用性能好等优点。更多还原

【Abstract】 Furfuryl alcohol is a widely-used organic chemical. Catalytic hydrogenation is currently used in the production of furfuryl alcohol from furfural, which has disadvantages of high hydrogen consumption and cost. Catalytic transfer hydrogenation of furfural to furfuryl alcohol by Cu-Pd/Al₂O₃ in near-critical isopropanol was proposed in this study. Cu-Pd/Al₂O₃ catalysts with different Cu and Pd loading were prepared via co-precipitation and characterized with XRD and BET. Effects of Cu-Pd/Al₂O₃ catalyst composition, catalyst loading, furfural concentration, reaction temperature and reaction time on the catalytic transfer hydrogenation were investigated. The results show that the 18%Pd/Cu-2%/Al₂O₃ bimetallic catalyst has the best catalytic activity. 100% furfural conversion and 86.4% furfuryl alcohol yield are achieved with 18%Cu-2%Pd/Al₂O₃ at 190℃ for 3 h. Good catalytic activity is maintained after 4 recycling use. The method proposed has advantages of zero hydrogen consumption, high furfuryl alcohol yield and good catalyst reusability.更多还原