In this study, the behavior of iron oxide powder which is the by-product of the pickling section of cold roll steel plate production plant has been investigated in order to filter or reduce the amount of carbon monoxide gas of pollutant gas. For improving the catalytic properties of iron oxide powder, copper and cobalt iron composite oxide have been prepared by grinding method. The structure of powder and size of particles were determined by using XRD and DLS methods. Furthermore, specific ...