Synthesis of BEC Zeolite Using Dimethyl-Dicyclopentyl Ammonium Hydroxide as Organic Template
1. School of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China;
2. State Key Laboratory of Green Chemical Engineering and Industrial Catalysis, Shanghai Research Institute of Petrochemical Technology, SINOPEC, Shanghai 201208, China
Abstract：Using designed synthetic dimethyl-dicyclopentyl ammonium hydroxide (DMDCpAOH) as organic template, synthesis of BEC zeolite (polymorph C of beta zeolite) was carried out under static condition via hydrothermal crystallization with the presence of Ge and F. The effects of the crystallization temperature, molar ratio of Si to Ge, molar ratio of H2O to (Si+Ge) and molar ratio of HF to (Si+Ge) on the crystallization and morphology of BEC zeolite were investigated. The obtained samples were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), N2 adsorption-desorption and thermogravimetric analysis (TGA). It is shown that with the optimized starting molar ratio of 0.833 SiO2 : 0.167 GeO2 : 0.5 DMDCpAOH : 0.5 HF : 15 H2O, after 10 days’ of crystallization at 170 ℃, the percentage of BEC phase in the obtained sample was high up to 85%. BEC zeolite showed a rod-like morphology with a length of about 20 μm, and the framework structure of BEC sample remained intact after calcination.
Wang Yingying 1,2,Wang Zhengdong 2 et al. Synthesis of BEC Zeolite Using Dimethyl-Dicyclopentyl Ammonium Hydroxide as Organic Template[J]. 化学反应工程与工艺, 2017, 33(1): 1-7.
