Magnetic susceptibility measurements applied to the study of the reversible hydrogen adsorption on high surface area CeO₂–ZrO₂mixed oxides in presence of precious metals

Preparation and characterization of nanocrystalline, high-surface area CuCeZr mixed oxide catalysts from homogeneous co-precipitation

“…Ce Zr mixed oxides are known to be reducible, but the degree of reduction is low for T < 200 • C according to Overbury et al [87]. A major contribution to the low-temperature reduction stems from the formation of OHgroups at the surface [35]. This can be neglected in TGA because of the marginal weight of hydrogen atoms.…”

“…This can be neglected in TGA because of the marginal weight of hydrogen atoms. The formation of oxygen vacancies by H 2 O release would be more TGA sensitive, but plays a significant role above 500 • C only [35]. Addition of reducible metals may improve the low-temperature reducibility of Ce Zr mixed oxides, but this is also mainly related to the formation of OH-groups [35].…”

“…Zirconium added to ceria to form Ce Zr mixed oxides inhibits the thermal sintering of CeO 2 [2,30,32,33]. Incorporation of Zr into the ceria lattice enhances the reducibility of ceria [34][35][36], which may improve the catalytic activity of MMO catalysts relative to single oxides [37,38]. The amount of Zr dopant also affects surface area and crystallite size of the MMO [37,39], in conjunction with the calcination temperature [40].…”

“…The formation of oxygen vacancies by H 2 O release would be more TGA sensitive, but plays a significant role above 500 • C only [35]. Addition of reducible metals may improve the low-temperature reducibility of Ce Zr mixed oxides, but this is also mainly related to the formation of OH-groups [35]. Cu has a moderate effect on the reducibility of ceria [41] that is dependent on the Cu content [42].…”

Hydrogen Production by Ethanol Steam Reforming on Ni-Based Catalysts: Effect of the Support and of CaO and Au Doping

“…17 The oxygen that is available on the surface can limit the deposition of carbon containing compounds through coke gasification with a consequent increase in the catalytic performance of the system. 18,19 Moreover, it was proved that cerium oxide minimizes the thermal impact on the metallic phase and increases the stability due to the strong interaction of ceria with the metal particles. As regard to the active phase, a non-noble metal is extremely attractive to upscale the process for one reason: the price.…”