Synthesis and crystallization kinetics of ZSM-5 without organic template from coal-series kaolinite

• Published in: Microporous and mesoporous materials 2014, Vol.184, p.134-140
• Main Authors: Pan, Feng, Lu, Xuchen, Wang, Yun, Chen, Shiwei, Wang, Tizhuang, Yan, Yan
• Format: Article
• Language: English
• Subjects: Chemistry; Coal-series kaolinite; Colloidal state and disperse state; Crystallization kinetics; Exact sciences and technology; General and physical chemistry; Ion-exchange; Porous materials; Surface physical chemistry; Template free; Zeolites: preparations and properties; ZSM-5
• ISSN: 1387-1811; 1873-3093
• DOI: 10.1016/j.micromeso.2013.10.013

Highly crystalline ZSM-5 was successfully synthesized by template-free method from coal-series kaolinite. The results demonstrated that mechanical treatment and conditions of synthesis influenced the crystallinity and purity of samples significantly. Apparent activation energy for induction and growth were 78.3 and 68.5kJ/mol, respectively, which was calculated from Arrhenius equation. •Adopte solid waste coal-series kaolinite as the only Si and Al resources to synthesize ZSM-5.•Synthesize ZSM-5 without organic template.•Synthesize ZSM-5 in solid–liquid heterogeneous phase system.•Activation energy for induction and crystal growth are 78.3 and 68.5kJ/mol, respectively. Calcined coal-series kaolinite was used as a combinational Si and Al sources to synthesize ZSM-5 via an organic template-free method. The influence factors such as ball-milling time, H2O/SiO2 ratios, and NaOH/SiO2 ratios have been investigated systematically. Furthermore, crystallization kinetics experiments were performed at 170–190°C for periods of time ranging from 6 to 96h, and obtained the curves as a function of time. The obtained samples were characterized by powder X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results indicated that ZSM-5 with excellent crystallinity could be obtained without organic template. Furthermore, mechanical treatment and synthesis conditions could influence the crystallinity and purity significantly. According to Arrhenius equation, the apparent activation energy for induction and growth were 78.3 and 68.5kJ/mol, respectively.