Synthesis of ZSM-5 at low temperature and atmospheric pressure in a pilot-scale batch reactor

The synthesis of ZSM-5 was carried out at 100 degrees C and atmospheric pressure in a 301 batch reactor. The results show that a quality of ZSM-5 can easily be synthesized with a well-developed framework structure within 72 h of reaction. The crystallinity readily reached almost 100% and the yield was well over 70% for samples having various SiO(2)/Al(2)O(3) ratios. As the SiO(2)/Al(2)O(3) ratio decreased, the morphology changed from euhedral to spherulite along with an increase of aggregation. The average BET surface area of the samples was 371 m(2) g(-1) and nuclear magnetic resonance spectroscopic studies showed a quality of ZSM-5 with the least defect sites in the framework structure. (C) 1998 Elsevier Science B.V. All rights reserved.