Synthesis and Characterization of ZSM-5 Molecular Sieve Made from Kaolin/Urea Intercalation Composite

• 作者: Zheng Shuqin Chen Ou Liu Sicheng Zhang Peiqing
• 来源期刊: 中国炼油与石油化工（英文版）
• 年，卷（期）: 2020,（4）
• 所属期刊栏目: Catalyst Research
• 页码范围: 93-100
• 页数: 8页
• 语种: 英文

摘要

In this paper,the kaolin/urea intercalation composites prepared by direct intercalation method and the catalysis composites containing ZSM-5 molecular sieve synthesized based on the kaolin/urea intercalation composites by an in-situ crystallization technique were investigated.The effects of the intercalation ratios and de-intercalation rate and the amounts of added kaolin/urea intercalation composite on the synthesis of the catalysis composites containing the ZSM-5 molecular sieve were studied.The samples were characterized by X-ray diffraction,FT-IR,TG-DTA,N2 adsorption-desorption,and SEM,respectively.The results showed that the structure of the samples prepared by kaolin/urea intercalation composite was pure ZSM-5 molecular sieve.The crystallinity of ZSM-5 molecular sieve increased at first and then decreased with the increase of intercalation ratio of kaolin/urea intercalation composite.When the intercalation ratio was 62％,the crystallinity of ZSM-5 molecular sieve was lower.When the amount of added kaolin/urea intercalation composite with an intercalation ratio of 22％was 3％,the crystallinity of ZSM-5 zeolite was improved to reach 65％.Compared to the crystallization product formed without adding kaolin/urea intercalation composite,the crystallinity of ZSM-5 molecular sieve has increased by 54.8％.The catalytic composites containing ZSM-5 molecular sieve had better thermal stability with a wide pore structure,featuring a particle diameter of about 2.5 μm,a BET specific surface area of 236 m2/g,and a pore size of 10.6 nm.