Metal organic framework assisted Co-Ce mixed oxide catalyst for carbon monoxide and ethylene oxidation

A series of CeO2/Co3O4 mixed nanocomposites with various Ce loading were fabricated by the pyrolysis of MOFs (metal organic frameworks), and their catalytic performance were evaluated by CO and C2H4 oxidation reaction. The prepared catalysts inherited polyhedral morphology of ZIF-67 (Zeolitic Imidazolate Framework-67) nano particles. By means of the synergistic effect of two different transition metal oxides, the catalysts exhibited superior performance for CO and C2H4 oxidation. The results show that for 2% 8% doping ratio of CeO2, the T50 (50% conversion temperature) of CO and C2H4 decreased by 32 and 33 C, respectively, as compared with the MOF-assisted pure Co3O4 catalyst. Stability of the catalyst was greatly enhanced with optimal Ce doping to Co3O4. A number of characterization techniques were used to study the morphology and physicochemical properties of the prepared catalysts. With the incorporation of Ce, polyhedral Co-Ce catalysts promoted specific surface area and lower reduction temperature. Likewise, Co3+/Co2+ and O-ads/O-latt improved with the addition of Ce, which played a significant role in CO and C2H4 oxidation at low temperatures.

Automated summary

CeO2/Co3O4 mixed nanocomposites were successfully prepared using MOFs, and the addition of Ce enhanced the catalytic performance and stability of Co3O4 for CO and C2H4 oxidation reactions.