SINOPEC Shanghai Research Institute of Petrochemical Technology Company Limited, State Key Laboratory of Green Chemical Engineering and Industrial Catalysis, Shanghai 201208, China
Abstract：In order to reduce the crystal defect and improve the acidity and stability of β zeolite, a new route to synthesize the β zeolite using a tiny amount of L-lysine in the industrial synthesis system was proposed in this study. The as-synthesized β zeolites were characterized by X-ray diffraction (XRD), X-ray fluorescence (XRF), field emission scanning electron microscopy (FESEM)，NH3 temperature programmed desorption (NH3-TPD) and pyridine adsorbed infrared (Py-IR) and N2 adsorption-desorption. The results showed that the as-synthesized β zeolites owned the higher crystallinity, SiO2/Al2O3 molar ratio, larger microporous specific area and different crystal morphology compared with the conventional β zeolite. Besides, the strength of acid and the amount of medium strong acid were also promoted on the Hβ zeolites synthesized by lysine-assisted, according to the results of NH3-TPD and Py-IR. When the as-synthesied β zeolites were prepared for the bifunctional catalysts and used in the tetralin hydrocracking reaction, the remarkable catalytic activity and long-term stability were achieved, which was attributed to the improved properties of medium strong acid, thermal and hytrothermal stability, and twelve-membered porous system of the β zeolite.
ZHOU Yanni,JIANG Xiangdong,TONG Weiyi et al. Lysine-Assisted Synthesis of β Zeolite and Its Catalytic Performance for Tetralin Hydrocracking[J]. Chemical Reaction Engineering and Technology, 2023, 39(4): 299-305.
