5. Zeolite Y/cobalt oxide (Co3O4) nanoparticles

### 5.1 Synthesis procedure

The zeolite Y/cobalt oxide (Co3O4) nanoparticles were synthesized by Davar et al. [25], and the schematic diagram is depicted in Figure 16. The Co3O4 nanocomposite was synthesized by an ion exchange of cobalt ions and zeolite Y in the presence of sodium hydroxide and calcination treatment; the synthesized zeolite Y/Co3O4 has a paramagnetic behavior at room temperature.

Figure 16. Synthesis procedure of zeolite Y/Co3O4 nanoparticles [25].
