Effect of La2O3-treatment on textural and solid–solid interactions in ferric/cobaltic oxides system

Structural, surface and catalytic properties of pure and ZrO2‐doped nanosized cobalt‐manganese mixed oxides

“…(iv) Zirconium species present in the uppermost surface layers of ZrO 2 ‐doped solids calcined at a temperature within 300–500°C is much bigger than the amount present in the bulk of solids. This finding is expected because all the doped solids were prepared by the wet impregnation method . Furthermore, the surface concentration of zirconium increases by increasing the calcination temperature of the doped solids.…”

“…Furthermore, all catalysts investigated are devoted with big catalytic activities as being evidenced from the small values of Δ E . The heterogeneity of surfaces of the catalysts investigated may find another evidence from the plot of the equation A = a exp( h Δ E ) derived on the basis of dissipation function of active sites by their energy as a consequence of surface heterogeneity: F ( E i ) = a exp( hE i ), where E i is the energy of site “ i ” with the substrate . The plot of ln A versus Δ E for the variously doped with ZrO 2 catalysts give a straight line whose slope and intercept are “ h ” and “ a ,” respectively.…”

The influence of La2O3-doping on structural, surface and catalytic properties of nano-sized cobalt–manganese mixed oxides

“…The relative atomic abundance of manganese, cobalt, oxygen and lanthanum species present in the uppermost surface layers of the calcined solids is given in [34]. The thickness of these layers is bigger than those measured by using XPS technique.…”

Physicochemical and Catalytic Conversion of Iso-propanol over NiO-doping/nanosized ZnO-Fe2O3 system

“…Many industrial applications used ferrites which can be prepared by different methods [7][8][9][10][11]. Many methods of synthesis have been developed to obtain fine particles with controlled shapes and sizes [7][8][9][10][11][12].…”

“…Many methods of synthesis have been developed to obtain fine particles with controlled shapes and sizes [7][8][9][10][11][12]. The prehistory of parent solids, their ratio and the addition of small amounts of certain foreign oxides affected the solid-solid interaction between ferric oxides and transition metal oxides [7][8][9][10][11][12][13]. Treating the transition metal ferrites with small amounts of other transition metal cations modified their activity and selectivity [9,10].…”