Difference of ZSM-5 zeolites synthesized with various templates

• Published in: Catalysis today 2004-09, Vol.93, p.729-734
• Main Authors: Sang, Shiyun, Chang, Fuxiang, Liu, Zhongmin, He, Changqing, He, Yanli, Xu, Lei
• Format: Article
• Language: English
• Subjects: Catalysis; Chemistry; Exact sciences and technology; General and physical chemistry; Synthesis; Template; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; ZSM-5 zeolite
• ISSN: 0920-5861; 1873-4308
• DOI: 10.1016/j.cattod.2004.06.091

ZSM-5 zeolites with similar Si/Al ratio were synthesized successfully using various templates ( n-butylamine (BTA), ethylamine (ETA), isopropylamine (IPA), ethylenediamine (EDA), ethanol (ETL), ethanol–ammonium (ETL–AM) and no template (NT)) under hydrothermal conditions. The samples were characterized by XRD, SEM, XRF, NH 3-TPD and BET surface area measurements in order to understand the template effects and the differences of the ZSM-5 samples. The synthesis of ZSM-5 with organic templates was relatively easier than those with inorganic templates and without template. SEM results revealed that ZSM-5 synthesized with different templates had different morphology and particle size. The Si/Al ratio and BET specific surface area of the sample with ethanol as template was the lowest. NH 3-TPD results showed that the sample synthesized without template had fewer strong acid sites than others. n-Hexane cracking reaction was carried out over the samples to evaluate the catalytic properties. All ZSM-5 zeolites were effective in n-hexane cracking reaction, especially for the sample synthesized without template.