关键词: Fe -MCM -41 分子筛,  , 　水热合成, 　选择性氧化, 　环己烷

Abstract:

        Hexadecyl trimethyl ammonium bromide was employed as template agent , sodium silicate as the silica source and the solution of iron nitrate were added in the synthesis process under 55 ℃, the mesoporous molecular sieve Fe -MCM -41 was synthesized using the hydrothermal method, which was crystallized for 48 hours under 160 ℃.The products were characterized by XRD, nitrogen adsorption and desorption , IR and TG -DTA .The results show that the molecular sieve has the favourable crystal structure and the iron has been located in framework of the molecular sieve .Fe -MCM -41 molecular sieve was used as catalyst and oxygen gas as oxidant for the selective oxidation of cyclohexane .The effects of temperature , time and pressure on cyclohexane selective oxidation reaction were investigated .The conversion of cyclohexane is increased as the increasing of time and temperature , but the pressure has little effect on it .Under the conditions of reaction time being 6 hours, temperature being 180 ℃, and pressure being 2 .5MPa , the conversion of cyclohexane is 14 .0 %, the selectivity of cyclohexanone is 9 .5 %, and the selectivity of cyclohexanol is 90.5 %.

Key words: 　Fe -MCM -41 molecular sieves, 　Hydrothermal synthesis , 　Selective oxidation, 　Cyclohexane