aluminogermanosilicate zeolite,SCM-25,synthesis of zeolite,physicochemical properties,Baeyer-Villiger oxidation," />
aluminogermanosilicate zeolite,SCM-25,synthesis of zeolite,physicochemical properties,Baeyer-Villiger oxidation,"/>
Synthesis and Catalytic Performance of Al-SCM-25 Zeolite
Synthesis and Catalytic Performance of Al-SCM-25 Zeolite
FU Wenhua, LI Xiangcheng, TAO Weichuan
State Key Laboratory of Green Chemical Engineering and Industrial Catalysis, SINOPEC Shanghai Research Institute of Petrochemical Technology Company Limited, Shanghai 201208, China
Abstract Introduction of Al element into framework has been proven to stabilize the framework and enhance the acidity of germanosilicate zeolite. In this contribution, the introduction of Al elements into the framework of SCM-25 zeolite was reported for the first time. Consequently, Al-SCM-25 zeolites with various aluminum content were prepared. The effects of water content, aluminum content, and the addition of seeds were investigated. It turned out that compared to the synthesis of Al-free SCM-25 zeolite, Al-SCM-25 zeolites could only completely crystallize at higher water content and the presence of seeds. The physicochemical properties of Al-SCM-25 zeolites, including textural properties, the coordination state of Al atoms, and the acidity were characterized by the combination of N2 physisorption, 27Al solid-state magic angle spinning solid nuclear resonance (MAS NMR) spectra and temperature-programmed desorption of NH3 (NH3-TPD) techniques. The Al-SCM-25 zeolites were of comparable specific surface area and micropore volume to SCM-25 zeolite. Major Al atoms were incorporated into the framework in tetrahedrally cooperated state, thus generating more substantial and stronger acid sites than SCM-25 zeolite. Moreover, Al-SCM-25 zeolites demonstrated higher cyclohexanone conversion and ε-caprolactone yield than Al-free counterpart in the Baeyer-Villiger oxidation of cyclohexanone, and recycle stability.
FU Wenhua,LI Xiangcheng,TAO Weichuan. Synthesis and Catalytic Performance of Al-SCM-25 Zeolite[J]. Chemical Reaction Engineering and Technology, 2024, 40(2): 142-149.
FU Wenhua,LI Xiangcheng,TAO Weichuan. Synthesis and Catalytic Performance of Al-SCM-25 Zeolite[J]. Chemical Reaction Engineering and Technology, 2024, 40(2): 142-149.
