Preparation and application of Co₃O₄ catalysts from ZIF-67 membranes over paper-like stainless steel fibers in isopropanol combustion

Co3O4 catalysts supported on paper-like stainless steel fibers (PSSF) were prepared by MOFs-templated (M) method and applied for catalytic combustion of isopropanol. Physicochemical properties of the as-synthesized Co(3)O(4 )catalysts were investigated by SEM, EDS mapping, TEM, XRD, BET, XPS and H-2-TPR, respectively. Characterization results of SEM and TEM shown that Co3O4 (M)-350 and Co3O4 (M)-400 still remained the dodecahedron shape of the ZIF-67 precursor and possessed porous structures. The XPS results shown that the ratio of Co3+/Co2+ and O-c/O-c + O-a + O-1 firstly increased and then decreased with the increase of calcination temperature. Among the as-synthesized catalysts, Co3O4 (M)-400 exhibited the highest activity for the catalytic combustion of isopropanol with the T-50 and T-90 values of 258 degrees C and 281 degrees C, respectively, which was associated with high BET surface area, high amount of Co3+ species and abundant surface chemisorbed oxygen. Moreover, Co3O4 (M)-400 was employed as a structured catalyst for isopropanol combustion, the catalytic kinetics were studied based on different feed concentration, bed height and GHSV. The experimental results indicated that the T-50 and T-90 of isopropanol combustion over Co3O4 (M)-400 with the bed height of 2 cm were increased slightly as the GHSV and feed concentration of isopropanol increased.