水法热合成的K-OMS-2催化剂上甲苯气相氧化制苯甲醛反应研究

Vapor-phase Oxidation of Toluene to Benzaldehyde over Hydrothermal-synthesized K-OMS-2Catalyst

采用水热法制备了氧化锰八面体分子筛(K-OMS-2),对其进行了XRD,FTIR,N2-低温物理吸附和SEM表征,并考察了其对甲苯气相氧化制苯甲醛反应的催化性能.研究结果表明,所制备的K-OMS-2具有纳米纤维状形貌(直径约为30nm、长度大于1μm).相对于固相法和热回流法,水热法制备的K-OMS-2催化剂上苯甲醛选择性和收率更高.

Manganese oxide octahedral molecular sieve （K-OMS-2） was prepared in the hydrothermal method.The K-OMS-2 was characterized with XRD,FT-IR,N2-adsorption and SEM,and was also employed as the catalyst for the vapor phase oxidation of toluene to benzaldehyde.It was shown that the K-OMS-2 prepared in the hydrothermal method had a morphology of nano-fiber with an average diameter of ca.30 nm and length of above 1 μm.Compared with those prepared in the solid phase method and refluxing method,the K-OMS-2 prepared in the hydrothermal method exhibited a larger yield of benzaldehyde with obviously higher selectivity.