羊毛-Pd(0)催化剂的制备、表征及其在水相中对醇的催化氧化反应

Preparation and Characterization of Wool-Pd(0)Catalyst and Its Catalytic Performance for Oxidation of Alcohol in Water

以天然生物高分子羊毛为载体,成功制备了负载型Pd(0)催化剂.采用电场发射扫描电镜和光电子能谱等方法对催化剂进行了表征.结果表明,Pd(0)颗粒均匀地分散在羊毛表面.将羊毛-Pd(0)催化剂用于醇氧化反应,考察了催化剂用量、碱类型和用量、反应温度及时间等因素对反应性能的影响.实验发现,在水相中,35mg羊毛-Pd(0)催化剂在0.2mmol的K2CO3存在下,可以高选择性地将0.2mmol的醇转化为相应的醛或酮,且该催化剂具有很好的重复使用性能.

Wool-Pd（0） catalyst was prepared successfully using nature biopolymer wool as stabilizer and supporter. The structure of the pal- ladium catalyst was characterized by field emission scanning electron microscopy and X-ray photoelectron spectroscopy, and the results showed that Pd（0） particles are well dispersed on the surface of wool. Applying wool-Pd（0） catalyst in the oxidation of alcohol under opti- mized conditions, several parameters such as catalyst amount, base, reaction temperature, and reaction time were screened. It was found that 35 mg wool-Pd（0） catalyst is available for the oxidation of 0.2 mmol alcohol to corresponding aldehyde or ketone with higher conversion and selectivity in the presence of 0.2 mmol K2CO3 and using water as reaction medium. The heterogeneous catalyst is of good reusability in this reaction system.