Synthesis of ZSM-5 directly from Kaolin without organic template: Part-1: effect of crystallization time

• Main Authors: Hartanto, D., Saputro, O., Utomo, W. P., Rosyidah, A., Sugiarso, D., Ersam, T., Nur, H., Prasetyoko, D.
• Format: Article
• Published: John Wiley and Sons Ltd 2016
• Subjects: Q Science (General)
• Online Access: http://eprints.utm.my/id/eprint/74379/; https://www.scopus.com/inward/record.uri?eid=2-s2.0-84991311756&doi=10.14233%2fajchem.2016.19348&partnerID=40&md5=2e7b641ffb2fb1bc19206e309e965b6a

Zeolite socony mobile-5 (ZSM-5) have been successfully synthesized directly from kaolin without using organic templates. ZSM-5 were synthesized by hydrothermal method at 175 °C with variation on crystallization time of 12, 24, 48 and 72 h. The molar composition of the zeolites was 10Na2O:100SiO2:Al2O3:1800H2O. The analysis of both from X-ray diffraction and FT-IR spectra showed that the ZSM-5 started to be formed during the crystallization time of 12 h. ZSM-5 with crystallization time of 24 h exhibit the highest crystallinity, about 101.17% based on the reference. The crystallinity decrease on the crystallization time of 48 and 72 h. In addition, the surface morphology of ZSM-5 investigated by SEM showed that the sample with Si/Al ratio of 5.74-9.49 with variation time of 24, 48 and 72 h formed aggregate with a hexagonal crystal shape without sharp angle. However, the samples with crystallization time of 12 h showed irregular shape.