| Title | Synthesis of a magnetic composite of silica with micro and nano-cobalt metallic structures from a spent catalyst (Co3O4) |
|---|---|
| ID_Doc | 7887 |
| Authors | Pavoski, G; Garjulli, F; dos Santos, CR; Moraes, ML; Tenorio, JAS; Espinosa, DCR |
| Title | Synthesis of a magnetic composite of silica with micro and nano-cobalt metallic structures from a spent catalyst (Co3O4) |
| Year | 2022 |
| Published | |
| Abstract | Cobalt is a magnetism metal used in different areas, like catalysts. When these cobalt catalysts are discarded, they must be appropriately disposed of in a suitable place. This work aims to recycle and apply circular economy with the synthesis of a magnetic composite through a spent catalyst (silica/cobalt). The catalyst is composed of 93 % Co(3)O(4 )and 7 % CoO. The best parameters to perform the thermal reduction of catalysts were using a CO-CO2 atmosphere were 1 h isothermal period at 350 C. The single CoO structure was confirmed and encapsulated in silica by the hydrolytic sol-gel method. These composites were subjected to a thermal reduction. The magnetic properties increased from a range of 0.0008-0.001 emu g(-1) to 15.86-30.96 emu g(-1). Thus, this work presented a viable process for recycling a spent catalyst and synthesis of a composite likely to be applied to materials to improve or add magnetism. |
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