Grinding synthesis of SAPO-44 in the presence of dual templates: a promising catalyst for methanol to propylene reaction

• Published in: Reaction kinetics, mechanisms and catalysis mechanisms and catalysis, 2024-06, Vol.137 (3), p.1355-1368
• Main Authors: Zhao, Xinhong, Wang, Hao, Peng, Xuejie, Ding, Mengqi, Long, Xuefeng, Ji, Dong, Li, Hongwei
• Format: Article
• Language: English
• Subjects: Catalysis; Chemistry; Chemistry and Materials Science; Industrial Chemistry/Chemical Engineering; Physical Chemistry
• ISSN: 1878-5190; 1878-5204
• DOI: 10.1007/s11144-024-02572-7

The grinding synthesis of CHA-type SAPO-44 molecular sieves were firstly achieved in the presence of dual templates. The structure and physicochemical properties of several selected SAPO-44 samples were analyzed by XRD, FT-IR, SEM, N 2 adsorption–desorption, EDS, and NH 3 -TPD techniques. It was found that the composition of dual templates has a greater influence on the Si content, crystal size, specific surface area and pore volume, acid strength and distribution of SAPO-44. In comparison to the SAPO-44 catalyst guided by the single template, the dual templates directed SAPO-44 catalysts showed more excellent catalytic performance in the methanol-to-olefin (MTO) reaction, with their catalytic lifetime extending from 90 to 320 min and P/E ratio reaching up to 50. The outstanding catalytic performance exhibited by these SAPO-44 catalysts demonstrated their high application prospect in the methanol to propylene process.