负载型纳米 Au 催化剂在许多还原反应中表现出良好的催化活性和选择性，是一类很有发展前景的选择性加氢催化剂。以侧柏叶提取液为还原 Au(III)溶液的生物质，采用原位还原法制备了Au/Fe3O4催化剂，利用 TEM、XRD、XPS 等方法对催化剂进行了表征，以肉桂醛选择性加氢为模型反应，考察了催化剂的催化性能，并对肉桂醛选择性加氢的工艺条件进行优化，得到最佳制备条件为：Au 负载量为1.0%，焙烧温度为200℃。最佳反应工艺条件为：反应温度60℃，反应压力5.0 MPa，催化剂用量为0.30 g，乙醇为溶剂。在此条件下反应3 h，肉桂醛的转化率为86.4%，肉桂醇的选择性为69.3%。
Au nanoparticles performed good catalytic activity and selectivity in many reactions and was regarded as promising catalyst in the selective hydrogenation process. Herein, Au/Fe3O4 catalysts were prepared by adsorption-reduction method with Cacumen Platyladi leaf extract, and characterized by transmission electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy, etc. The catalytic performance of the catalysts was investigated by employing the selective hydrogenation of cinnamaldehyde as the model reaction. The results indicated that 1.0 wt% Au/Fe3O4 catalyst calcined at 200℃ had high selectivity for cinnamaldehyde hydrogenation. The optimal reaction conditions were as follows: reaction temperature 60℃, pressure 5.0 MPa, catalyst amount 0.30 g, and ethanol as solvent. After 3 h reaction under the optimal conditions, the conversion of cinnamaldehyde and the selevtivity to cinnamyl alchol reached 86.4% and 69.3%, respectively.
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