掺杂Co对CNTs负载Pt催化剂上肉桂醛选择性催化加氢性能的影响

研究了Co的掺杂对Pt/CNTs催化剂催化加氢肉桂醛反应性能的影响。结果发现, Co的掺杂对Pt/CNTs催化剂催化加氢活性起到明显促进作用, 并有利于C＝O基团的选择性加氢。Pt-0.17% Co/CNTs催化剂显示了较高的肉桂醇加氢选择性, 在反应条件为70℃、2 MPa和1.5 h时, 肉桂醛的加氢转化率达到97.1％,生成肉桂醇的选择性达到93.6％。同时, 初步研究了该催化剂上肉桂醛催化加氢反应动力学, 催化反应的活化能为26.5 kJ•mol^-1。

Effect of Co on selective hydrogenation of cinnamaldehyde to cinnamyl alcohol over Pt/CNTs catalyst

The Pt-Co catalysts supported on carbon nanotubes (CNTs) were prepared by wet impregnation and used for the selective hydrogenation of cinnamaldehyde (CMA) to the corresponding cinnamyl alcohol (CMO).The results showed that the addition of Co could improve the catalytic activity and selectivity for C=O bond.The Pt-0.17%(mass) Co/CNTs catalyst exhibited the best hydrogenation activity of 97.1% conversion and selectivity for C=O bond of 93.6 % to cinnamyl alcohol (CMO) at 70℃ under 2.0 MPa H₂ pressure with the reaction time of 1.5 h. The study of hydrogenation kinetics of CMA over Pt-0.17%(mass)Co/CNTs catalyst indicated that the activation energy of hydrogenation of cinnamaldehyde was 26.5 kJ•mol^-1.