Synthesis and characterization of nanocrystalline CoAPO-5: Structural and morphological analysis by alteration on hydrothermal parameters

Authors

• A. Hassanvand ¹
• M. Asghari ²
• H. Halakoei ³
• B. Rajaei ^{1, 2}

1. Separation Processes Research Group (SPRG), Department of Engineering, University of Kashan, Kashan, Iran.
2. Energy Research Institute, University of Kashan, Ghotb-e-Ravandi Ave., Kashan, Iran.
3. Energy Research Institute, University of Kashan, Kashan, Iran.

Abstract

Nano-zeolite CoAPO-5 as a member of AFI family, was synthesized via a hydrothermal treatment, and structurally characterized using X-ray diffraction (XRD), scanning electron microscope (SEM), and energy dispersive X-ray analysis (EDAX). The effects of crystallization temperature and time on the structure of these powder products were studied. XRD patterns of the synthesized powders revealed a high-crystallinity and pure phase of AFI. SEM images and Scherrer equation showed the nano-size of the obtained CoAPO-5. Also, SEM images showed nano-wires as small as 30-50 nm in CoAPO-5 structures. According to EDAX analysis, P/Al ratio of the prepared CoAPO-5 powder was about 1.5. Crystal sizes and the crystallinity of CoAPO-5 reduced at higher temperatures of hydrothermal treatment. On the other hand, the larger crystals grew by increasing the crystallization time from 24 to 48 h.

Keywords

• Nano-Zeolite
• CoAPO-5
• Characterization
• Synthesis
• structure
• Temperature