Modified seeding method to produce hierarchical nanocrystalline ZSM-5 zeolite. (December 2020)

• Record Type: Journal Article
• Authors: Hamidzadeh, Marzieh; Saeidi, Mohsen; Komeili, Samane
• Is Part Of: Materials today communications. Volume 25(2020)
• Publication Date: 2020-12
• Subjects: ZSM-5 zeolite -- Hydrothermal synthesis method -- Silicate solutions -- Structural hierarchy; Materials science -- Periodicals; 620.11
• DOI: 10.1016/j.mtcomm.2020.101308
• Languages: English
• ISSNs: 2352-4928

Abstract

Graphical abstract: Highlights: A novel modified seed-induced synthesis method using lower amount of organic template and silica source was introduced. Simultaneous use of silicate-1 and commercial ZSM-5 zeolite as a seed, slightly decreased the total acidity while enhanced the mesopore surface area and promoted the chemical reaction. The final pH of samples substantially affects the morphology, particle size, and hierarchical structure of the final ZSM-5 zeolites. Abstract: A series of ZSM-5 nano-zeolites with hierarchical porosity was prepared by a modified seed-induced method using a mixture of silicate-1 and commercial Na-ZSM-5 zeolite as a seed to reduce the production cost. The XRD and FTIR results proved that the pure ZSM-5 phase with a high degree of crystallinity was crystallized. Furthermore, the synthesized samples using a mixture of silicate-1 and commercial ZSM-5 as a seed exhibited more dealumination during the hydrothermal aging process, resulting in a higher Smeso /SBET ratio than other samples and the highest ratio of Brönsted/Lewis acid sites among all the samples. The SEM and BET results also confirmed that the final pH after the synthetic process extensively affected the morphology, specific area and pore volume of products. The purposed method by employing a lower amount of the organic template and silica source might lead to a more economical and environmentally friendly approach for the hierarchical ZSM-5 zeolite production to benefit the relevant industries.