Surface Modification of Cobalt-Manganese Mixed Oxide and Its Application for Low-Temperature Propane Catalytic Combustion

摘要

The CoMn mixed metal oxide was firstly fabricated using Co(NO3)2, KMnO4 and K2CO3. The tuned catalysts, donated as xM-Co3Mn1 (x = 0, 0.025, 0.05 and 0.1), were synthesized by selective dissolve method (SD). The physicochemical properties induced by different acid concentrations on catalysts were explored via a series of characterization techniques. Compared with the original material, the catalysts treated by SD had higher advantages in enriching crystal defects, surface Co~(2+) and adsorbed oxygen species as well as increasing the specific surface areas (SSA). Among acid-treated catalysts, 0.05 M-Co3Mn1 exhibited the best catalytic activity, while the T_(50) and T_(90) were 71 and 117℃ lower than the original one. Meanwhile, 0.05 M-Co3Mn1 showed excellent stability and great regeneration ability.