硅源对高岭土合成ZSM-5分子筛的影响

Influence of Silica Source on ZSM-5 Molecular Sieves Synthesized by Kaolin

摘要:

本文以煤系高岭土为原料，水玻璃、气相SiO2、正硅酸四乙酯和硅酸为硅源，氢氧化钠为矿化剂，四丙基氢氧化铵为模板剂合成 ZSM-5分子筛。随后，在氯化铵氛围下离子交换合成HZSM-5分子筛。利用 XRD、SEM、FTIR、NH3-TPD、BET对HZSM-5进行了表征。最后，利用甲醇制汽油反应（MTG）测试HZSM-5的催化性能。结果表明，以硅酸合成的HZSM-5分子筛催化效果优异，在MTG反应43 h后开始失活，高碳烃类产物的选择性38.99%。

Abstract:

In this paper, the ZSM-5 zeolite was synthesized using coal-series kaolin as material, sodium silicate, fumed silica, silicon acetate and silicic acid as silicon sources, sodium hydroxide as mineralizer and tetrapropylammonium hydroxide as template. Then, HZSM-5 was synthesized by exchanging ion in ammonium chloride. The HZSM-5 samples were characterized by XRD, SEM，FTIR, NH3-TPD and BET. Finally, the catalytic performance of HZSM-5 samples were evaluated by Methanol to Gasoline(MTG) reaction. The results indicate that the HZSM-5 molecular sieve synthesized from silicic acid has an excellent catalytic performance, starting to deactivate at 43 h after MTG reaction, and the selectivity of higher hydrocarbons products was 38.99%.