Investigation of hydrothermal synthesis parameters on characteristics of T type zeolite crystal structure

✍ Scribed by Mojtaba Mirfendereski; Toraj Mohammadi

• Publisher: Elsevier Science
• Year: 2011
• Tongue: English
• Weight: 960 KB
• Volume: 206
• Category: Article
• ISSN: 0032-5910
• DOI: 10.1016/j.powtec.2010.10.003

✦ Synopsis

Hydrothermal synthesis of zeolite T in aqueous alkaline solutions without using templates was investigated. Zeolite T crystals were prepared via hydrothermal synthesis using milk-like aluminosilicate gel with a composition of aSiO 2 :bAl 2 O 3 :cNa 2 O:dK 2 O:xH 2 O. The effects of molar compositions including silicon module (n RM = a/b) and relative alkalinity (α = OH/SiO 2 ), and crystallization conditions including crystallization temperature (T) and time (t) on the yield of T-type crystals were investigated. This research work examines changes in the yield of crystalline zeolite phases by varying the gel composition parameters (n RM =20-25, and α = 0.71-0.82) and crystallization process temperature and time (T = 100°-140 °C, t = 120-216 h), while keeping constant the parameters [OH] = 2.77 m, U RM (Na/Na + K) = 0.75, stirring time = 24 h , stirring temperature = 30 °C, and drying temperature = 100 °C. The crystal species of zeolite T were characterized by XRD (X-ray diffraction) and SEM (Scanning Electron Microscope).