以KL分子筛为载体，采用浸渍法制备了Pd/KL负载型催化剂，对比了不同载体的钯负载型催化剂的苯酚选择性加氢反应及反应条件等对其催化活性和产物选择性的影响。结果表明，催化剂载体性质对该反应的催化性能具有较大的影响，载体表面碱性较强时，催化剂表现出更高的催化活性；由于KL分子筛载体中特殊的阳离子分布（孔道中必须存在K⁺），使分子筛表面呈碱性，因此表现出优异的催化性能。在反应温度为60℃、反应时间为6 h时，其苯酚转化率可达96.1%，环己酮选择性达到94.4%。

Pd/KL catalysts are prepared via impregnation method by using KL as support.The catalytic performances of the catalysts with different supports are compared for selective hydrogenation of phenol to make cyclohexanone.The influences of reaction conditions on catalytic activity and products selectivity are investigated.The results show that the properties of the support have a great influence on the catalytic performance of the catalyst.The catalyst shows higher catalytic activity when the surface basicity of the support is stronger.Due to special cationic distribution in KL support,its surface presents alkaline.Therefore,under the same reaction conditions,Pd/KL catalyst exhibits higher activity and a better selectivity of cyclohexanone than other catalysts.The conversion rate of phenol and the selectivity of cyclohexanone can reach about 96.1% and 94.4%,respectively under a reaction temperature of 60℃ and a reaction time of 6 h.

刘嵩(1994-),女,硕士研究生,研究方向为分子筛的制备及其应用,songliu715@163.com