以HY分子筛为载体,采用水热法合成了系列Co₃O₄/HY复合分子筛催化剂,通过XRD、SEM、EDS、FT-IR、BET等手段对Co₃O₄/HY进行表征,并对Co₃O₄/HY分子筛催化氧气液相氧化苯甲醇合成苯甲醛的性能进行研究。结果表明,Co₃O₄的引入未破坏分子筛的骨架结构,且Co₃O₄在HY晶体表面形成片层蜂窝状多孔结构,可有效增加催化剂样品的介孔孔容和外表面积,增加催化活性。但Co₃O₄负载过量易出现堆叠现象,使得介孔孔容和外表面积降低,不利于氧化反应进行。以1.0-Co₃O₄/HY为催化剂,在适宜的反应条件下苯甲醇的转化率和苯甲醛的选择性分别达到73.2%和95.8%;催化剂重复使用5次,依然表现出较好的催化活性。

Co₃O₄/HY composite molecular sieve catalysts are synthesized by a hydrothermal method with HY molecular sieve as carrier.The prepared catalysts are characterized by means of XRD,SEM,EDS,FT-IR,and BET.Moreover,the catalytic properties of Co₃O₄/HY for the oxidation of benzyl alcohol to benzaldehyde using oxygen as an oxidant are investigated.The result shows that the loading of Co₃O₄ on HY molecular sieve has not destroyed the framework structure of HY,and Co₃O₄ forms a porous cellular structure on the surface of HY,which can effectively help the catalyst to increase the mesopores volume and the external surface area,therefore enhancing the catalytic activity.While the decreases of mesopores volume and external surface area are observed for 2.0-Co₃O₄/HY,which can be explained by stacked phenomenon due to the high loading of Co₃O₄.The conversion of benzyl alcohol reaches 73.2% and the selectivity of benzaldehyde reaches 95.8% when the reaction has been performed over 1.0 m-Co₃O₄/HY catalyst under suitable reaction conditions.The catalyst has still shown a good catalytic activity after it has been reused for 5 runs.