炭材料负载Pt催化肉桂醛选择性加氢性能的研究

Study on catalytic behavior of Pt-supported carbon materials for selective hydrogenation of cinnamaldehyde

采用液相还原法分别制备了碳纳米管(MWCNT)、活性炭(AC)、碳纳米纤维(CNF)和炭气凝胶(CA)负载质量分数3%的Pt催化剂,并对催化剂的结构和形貌进行了XRD和TEM等表征。以肉桂醛加氢作为探针反应,研究了其催化肉桂醛加氢的活性和产物选择性。结果表明,炭材料的结构对其催化肉桂醛加氢行为具有重要影响,纳米炭材料催化剂(Pt/MWCNT、Pt/CNF)表现出较高的C O选择性加氢行为,而无定形碳催化剂表现为C C选择性加氢,同时Pt/MWCNT的催化活性最高。

The 3wt% Pt/carbon catalysts, i. e., multi-walled carbon nanotube（MWCNT）, active carbon （AC） , carbon nanofibers （CNF） , and carbon aerogel（CA） , were prepared by liquid reduction method, respectively. The crystal structure and morphologies of the catalysts were characterized by XRD and TEM. The hydrogenation activity of cinnamaldehyde （CALD） and the selectivity to the product were studied using the selective hydrogenation of CALD as the probe reaction. The results showed that a clear effect of the carbon support on the catalytic behaviors of the catalysts was observed. The selective hydrogenation of C=O bonds in CALD occurred over CNF-and MWCNT-based catalysts while the selective hydrogenation of C=C bonds in CALD was dominant in the case of Pt-supported CA and AC catalysts. Pt/MWCNT showed the highest conversion of CALD among the catalysts investigated.