Preparation of cobalt based catalyst and its catalytic oxidation performance of toluene

• 1、Chemistry and Chemical Engineering School, Chongqing University, Chongqing 401331

Abstract：Co-MOFs and NiCo-MOFs precursors were prepared by simple MOFs precipitation method, and then Co3O4 and NiO/Co3O4 nanocube catalysts were obtained by pyrolysis of the precursors, respectively. Compared with Co3O4, NiO/Co3O4 has the best catalytic performance for toluene at toluene concentration of 1 000 ppm and space speed of 20 000 mL g-1 h-1, and its T90 (Reaction temperature corresponding to toluene conversion of 90%) is 303 ℃. Even if 5 vol.% water vapor is introduced into the system, NiO/Co3O4 still has good stability and water resistance in the test period of 18 h. The catalysts were characterized by XRD, SEM, BET, XPS. The results show that the catalysts have porous and hollow structures. Compared with single Co3O4, NiO/Co3O4 catalyst has larger specific surface area, which is conducive to mass transfer of gas molecules and exposure of more active sites. There were abundant oxygen vacancies and high Oads/Olatt ratio on the surface of the catalyst, which improved the degradation activity of toluene. Therefore, MOFs derived metal oxideswith special structures are promising catalysts for VOCs degradation.

Keywords： MOFs. Hollow structure Cobalt based catalyst Toluene