Ceria-nano supported copper oxide catalysts for CO preferential oxidation: Importance of oxygen species and metal-support interaction

Role of Interfacial Cu‐Ions in Polycrystalline Cu‐CeO2: In‐Situ Raman, In‐situ DRIFT and DFT Studies for Preferential Oxidation of CO in Presence of Excess H2**

“…A blue‐shift from 459 to 462 cm −1 of the F 2g peak was observed when loading was increased from 2.8 % (2.8 %Cu‐CeO 2 HT ) to 7 % (7 %Cu‐CeO 2 HT ) as shown in Figure 8. Earlier report says that the peak position shift and broadening of the F 2g peak are influenced not only by the particle sizes but also by the incorporation of copper in the cerium oxide lattice [24] . This blue shift suggests forming larger‐sized Cu‐CeO 2 particles [24] .…”

“…This blue shift suggests forming larger‐sized Cu‐CeO 2 particles [24] . In general, the higher red‐shift is correlated with more copper incorporation into the ceria to form a solid solution, creating more lattice vacancies [24] …”

“…Earlier report says that the peak position shift and broadening of the F 2g peak are influenced not only by the particle sizes but also by the incorporation of copper in the cerium oxide lattice. [24] This blue shift suggests forming larger-sized Cu-CeO 2 particles. [24] In general, the higher red-shift is correlated with more copper incorporation into the ceria to form a solid solution, creating more lattice vacancies.…”

Synthesis of oxygen vacancies enriched Cu/ZnO/CeO2 for CO2 hydrogenation to methanol

“…As shown in Table 1, the copper species in the two catalysts mainly exist in the form of Cu 2+ with higher percentage in CuZnCe‐P than in CuZnCe‐C. This phenomenon occurred because Ce species have strong redox property that creates strong interaction between copper and ceria oxides and promotes the redox cycle: Cu + + Ce 4+ ↔ Cu 2+ + Ce 3+ 15 . For Fig.…”

CuO-CeO2 catalysts based on SBA-15 and SBA-16 for COPrOx. Influence of oxides concentration, incorporation method and support structure

“…Likewise, the CuO-CeO2 system has also been widely studied by several authors and the results obtained in COPrOx are comparable to those reached by noble catalysts on a great number of occasions. In this sense, the CuO/CeO2 system performance depends of the diverse factors, such as the preparation methods, the concentrations of actives phases, the promoters, etc., since this influence in the physicochemical properties affecting the Cu + /Cu 2+ and Ce 3+ /Ce 4+ redox couples [17][18][19][20][21][22][23]. The relative high reactivity of CuO-CeO2 catalysts towards CO rather than H2 oxidation is attributed to the synergistic copper-ceria interactions on the interface.…”