Abstract:
The hopcalite (CuMnOx) catalyst is a well-known catalyst for CO oxidation at a low temperature and it is synthesized by the
co-precipitation method with diferent types of precursors. Activity of the CuMnOx catalysts for CO oxidation is strongly
dependent upon the combination of precursors, ranking in order {Mn(Ac)2+Cu(NO3)2}>{Mn(Ac)2+Cu(Ac)2}>{Mn(N
O3)2+Cu(NO3)2}>{Mn(NO3)2+Cu(AC)2}. All the precursors were precipitated by KMnO4 solution and the precursors
mostly comprised of MnO2, Mn2O3 and CuO phases. Keeping the same precipitant while changing the precursors caused
a change in the lattice oxygen mobility which infuenced the CO oxidation activity. The calcination strategy of the precursors has great infuence on the activity of resulting catalysts. The reactive calcination (RC) conditions produce multifarious
phenomena of CO oxidation and the precursor decomposition in a single-step process. The activity order of the catalysts
for CO oxidation was as follows: reactive calcination (RC)>fowing air>stagnant air. Therefore, we recommended that the
RC route was the more appropriate calcination route for the production of highly active CuMnOx catalysts. All the catalysts
were characterized by X-ray difraction, Fourier transform infrared spectroscopy, Brunauer–Emmett–Teller analysis, X-ray
photoelectron spectroscopy and scanning electron microscopy technique. The infuence of precursors on the structural properties and the catalytic activity of co-precipitation derived binary CuMnOx catalysts for CO oxidation has been investigated.
