Effect of silver oxide doping on surface and catalytic properties of Co3O4/Al2O3 system

Tentative explanation for the kinetic compensation effect in doped catalysts

“…Provided that the compensation effect really is caused by pure dual site catalysts with different population densities of active centres that present equal reaction mechanisms, equation (4) can be used to find the values of A 1 and A 2 , which are proportional to the population densities of both types of active centres, from the experimental kinetic data obtained from catalysts that show a compensation effect. To test this point we have used kinetic data taken from the literature related to metal-doped or metal oxide-doped catalysts that clearly show compensation effects [12][13][14][15]. In principle such catalysts are prone to dual-site catalytic behaviour [16].…”

“…Compensation effect associated to dual site catalysis with random populations of active centres (A 1 = 75,000 ± 43,500, A 2 = 3.00 ± 1.74). Inset plot: variation of the average regression coefficient (<R 2 >) obtained with the different linear regressions used to build each compensation effect trend with the relative difference of activation energies Results of fitting data reported in[12][13][14][15] to equation(4). Compensation effect Results of fitting data reported in[12] to equation (4).…”

“…Results of fitting data reported in[15] to equation (4). Variation of A 1 and A 2 with the Ag 2 O content Results of fitting data reported in[13] to equation (4). Variation of A 1 and A 2 with the Ag 2 O content Results of fitting data reported in[14] to equation (4).…”

Thermal solid–solid interactions and physicochemical properties of Co3O4/MoO3 system treated with Al2O3

“…Doping of single or mixed oxide system with certain foreign oxides accompanied by significant modifications in their thermal stability, reactivity, electrical, optical, magnetic, surface and catalytic properties [9]. It is known that the activity and selectivity of a large variety of catalysts can be modified by different methods, such as loading on a finely divided support and doping with certain foreign oxides [10].…”

“…It is known that the activity and selectivity of a large variety of catalysts can be modified by different methods, such as loading on a finely divided support and doping with certain foreign oxides [10]. In addition, previous work showed that the combination of two oxides leads to new systems with new physical and chemical properties [9,10]. The catalytic and physicochemical properties of different oxide catalysts depend mainly, on chemical composition, method of preparation and calcination condition [11,12].…”