Preparation and Catalytic Performance of Noble Metal Loaded Core-Shell Structured Catalyst
1. State Key Laboratory of Green Chemical Engineering and Industrial Catalysis, Shanghai Research Institute of Petrochemical Technology, SINOPEC, Shanghai 201208, China;
2. School of Chemistry and Molecular Engineering, East China Normal University, Shanghai 200062, China;
3. Department of Chemistry, Fudan University, Shanghai 200433, China
Abstract： Core-shell structured zeolites with ZSM-5 as core and dendritic SiO2 as shell were successfully prepared using cetyltrimetylammonium bromide (CTAB) as surfactant, urea as alkaline source and tetraethyl orthosilicate (TEOS) as silicate source in the microemulsion system composed of cyclohexane and n-pentanol. The effects of the preparation conditions such as temperature, time, addition of urea and TEOS on the preparation of the catalyst were investigated. The zeolites were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and N2 adsorption-desorption. The results indicated that the obtained core-shell structured zeolites exhibited excellent monodispersity, integrity and hydrothermal stability when the preparation temperature was between 100-120 , reaction time was 4 h, the molar ratio of urea ℃ to TEOS was 1 and the molar ratio of TEOS to ZSM-5 was 0.9-1.2. Finally, the noble metal Pt was loaded on the dendritic mesoporous SiO2 shell and the obtained bifunctional catalysts of Pt/ZSM-5@MS exhibited high catalytic activity and reusability in the one-pot preparation of methyl isobutyl ketone (MIBK) from acetone.
$author.xingMing_EN,$author.xingMing_EN,$author.xingMing_EN et al. Preparation and Catalytic Performance of Noble Metal Loaded Core-Shell Structured Catalyst[J]. 化学反应工程与工艺, 2017, 33(4): 289-297.
