Effects of synthesis parameters on the crystallization profile and morphological properties of SAPO-5 templated by 1-Benzyl-2,3-Dimethylimidazolium Hydroxide

• Main Authors: Auwal, Ismail Alhassan, Khoerunnisa, Fitri, Dubray, Florent, Mintova, Svetlana, Ling, Tau Chuan, Wong, Ka-Lun, Ng, Eng-Poh
• Format: Article
• Published: MDPI 2021
• Subjects: QD Chemistry; TA Engineering (General). Civil engineering (General)
• Online Access: http://eprints.um.edu.my/28628/
• Institution: Universiti Malaya

The formation of SAPO-5 molecular sieves is studied under hydrothermal conditions in the presence of a new templating agent, 1-benzyl-2,3-dimethylimidazolium hydroxide (bzmIm]OH). The syntheses were carried out by varying the synthesis parameters, viz. crystallization temperature, heating time and reactants molar composition (SiO2, Al2O3, P2O5, bzmIm](+), H2O) in order to investigate the role of each synthesis parameter on the formation of SAPO-5. The results showed that these synthesis parameters had significant influences on the entire crystallization process (induction, nucleation, crystal growth, and Ostwald ripening) and physicochemical properties of SAPO-5 (morphology and crystal size). Moreover, this study also demonstrated a fast hydrothermal synthesis approach where a SAPO-5 molecular sieve with hexagonal prism morphology could be crystallized within 10 h instead of days using a novel bzmIm]OH heterocyclic template, thus offering an alternative route for synthesizing zeolite-like materials for advanced applications.