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研究了通过气相沉积法裂解甲烷在TiO2表面生长纳米碳纤维层,制备具有中孔孔径结构的结构化纳米碳纤维的方法。利用SEM-EDS和BET对该载体进行了表征。结果发现,该结构化纳米碳纤维载体的纳米碳纤维层厚度1.5～2.0μm,比表面积60.3 m2/g,其中外表面积为51.1 m2/g,只有很少的内表面积;平均孔径为5nm。在肉桂醛加氢反应中,该载体负载Pd催化剂能明显降低内扩散对反应选择性的影响,肉桂醛转化率低于56%时,氢化肉桂醛选择性达98%,明显高于常规活性炭负载型Pd催化剂。
A method for preparing structured carbon nanofibers with mesopore structure was developed by cracking carbon monoxide on the surface of TiO2 by vapor deposition. The carrier was characterized by SEM-EDS and BET. The results showed that the carbon nanofibers of the structured carbon nanofiber support had a thickness of 1.5-2.0 μm and a specific surface area of 60.3 m2 / g, with an external surface area of 51.1 m2 / g, with only a small inner surface area and an average pore diameter of 5 nm. In the cinnamic aldehyde hydrogenation reaction, the supported Pd catalyst can significantly reduce the effect of internal diffusion on the reaction selectivity. When the cinnamaldehyde conversion is lower than 56%, the selectivity to hydrocinnamic aldehyde is 98%, which is obviously higher than that of the conventional activated carbon Type Pd catalyst.