Wang Hua-Qin, Cui Yun-Qi, Ding Ya-Long, Xiang Mei, Yu Pei, Li Rong-Qiang
College of Chemistry and Pharmaceutical Engineering, Huanghuai University, Zhumadian, China.
School of Chemical Engineering and Materials, Changzhou Institute of Technology, Changzhou, China.
Front Chem. 2022 Mar 14;10:854664. doi: 10.3389/fchem.2022.854664. eCollection 2022.
Zeolite SAPO-34 has been widely used in the industry because of its special pore structure and wide distribution of acid sites in the pore channel. However, traditional SAPO-34 with a small pore size suffers from carbon deposition and deactivation in catalytic reactions, and its inability to catalytically convert bulky organic molecules limits its industrial application. Meanwhile, impurities of SAPO-5, which have weak acidity leading to rapid catalyst deactivation, appear in SAPO-34 zeolite. Therefore, it is of great significance to synthesize SAPO-34 zeolite with a mesoporous pore structure, which can significantly improve the transfer of molecules in zeolites. In this paper, SAPO-34 zeolite with a hierarchical pore structure was synthesized, and its hydrodesulfurization performance for 4,6-dimethyldibenzothiophene (4,6-DMDBT) was studied in a fixed bed reactor. The characteristic results show that BET-specific surface area, micropore volume, and mesoporous volume of synthesized SAPO-34 are 754 m g, 0.25, and 0.23 cm g respectively, and the pore size is mainly concentrated at 4 nm. The catalytic conversion of 4,6-DMDMT with Co- and Mo-supported SAPO-34 is about 83%, which is much higher than the catalytic performance of AlO.
沸石SAPO - 34因其特殊的孔结构和孔道内酸位点分布广泛而在工业中得到广泛应用。然而，传统小孔径的SAPO - 34在催化反应中存在积碳和失活问题，并且其无法催化转化大分子有机分子限制了其工业应用。同时，在SAPO - 34沸石中会出现SAPO - 5杂质，其酸性较弱导致催化剂快速失活。因此，合成具有介孔孔结构的SAPO - 34沸石具有重要意义，这可以显著改善沸石中分子的传输。本文合成了具有分级孔结构的SAPO - 34沸石，并在固定床反应器中研究了其对4,6 - 二甲基二苯并噻吩（4,6 - DMDBT）的加氢脱硫性能。表征结果表明，合成的SAPO - 34的BET比表面积、微孔体积和介孔体积分别为754 m²/g、0.25 cm³/g和0.23 cm³/g，孔径主要集中在4 nm。负载Co和Mo的SAPO - 34对4,6 - DMDMT的催化转化率约为83%，远高于AlO的催化性能。
