Enhanced CO oxidation in porous metal-oxide nanoparticles derived from MOFs

Porous nanoparticles integrating the advantages of porosity and structural coherence typically possess numerous active sites confined on their surfaces. In this study, porous Co 3 O 4 , Fe 2 O 3 and Fe 3 O 4 nanoparticles are synthesised by one-step pyrolysis from metal-organic frameworks (MIL-101 (Fe) and ZIF-67 (Co)) to test the performance of CO oxidation. The prepared porous nanoparticles have uniform and stable porous structures without obvious shrinkage and structural collapse. The best catalytic performance was achieved by the porous Co 3 O 4 nanoparticles, which reached 100% CO conversion at 130 °C without any decay in catalytic activity after 48 h of reaction. DRIFTS results present the mechanism of the CO oxidation by porous Co 3 O 4 nanoparticle catalysis. The excellent catalytic activity of the porous Co 3 O 4 nanoparticles is related to the large specific surface area and surface oxygen vacancies. This work provides a design approach for synthesizing other porous metal oxide nanoparticles and has reference value in the field of CO oxidation. Porous nanoparticles of Co 3 O 4 , Fe 2 O 3 and Fe 3 O 4 were successfully developed. Among them, the porous Co 3 O 4 nanoparticles greatly improved the catalytic CO oxidation performance due to their large specific surface area and excellent Co active sites.