Low-temperature CO oxidation on CuO/CeO₂catalysts: the significant effect of copper precursor and calcination temperature

Abstract

The performance of CuO/CeO2 catalysts for CO oxidation strongly depends on the type of copper precursor and the calcination temperature.

Solvothermal synthesis in ethylene glycol and catalytic activity for CO oxidation of CuO/CeO2 catalysts

“…Note that the Cu(I) % is just calculated for comparison and does not represent the accurate content of Cu ? on these CuO/CeO 2 catalysts due to the lower CuO loading and the photoresolution of the spectrometer [40].…”

CO oxidation on mesoporous SBA-15 supported CuO–CeO2catalyst prepared by a surfactant-assisted impregnation method

“…42,43 As shown in Table 3, the I sat /I main values of all the catalysts are lower than 0.55, further suggesting the presence of low-valence copper species in these CuO-CeO 2 /SBA-15 catalysts. Furthermore, it is apparent that 3-CCS displays smaller I sat /I main value than the other catalysts, indicating that the stronger interaction between copper species and ceria has induced the reduction of more amounts of Cu 2+ (mainly to Cu + ), 4 which is regarded as the better CO adsorption site in CO oxidation.…”

“…Therefore, increasing attention has been given to the non-noble metal catalysts, particularly CuO-CeO 2 system. Numerous studies have found that the CuO-CeO 2 catalysts display high catalytic activity in the oxidation of CO, [2][3][4][5][6][7] which is comparable to or even higher than that on some noble metals like Pt.…”

“…On the other hand, the lattice parameters of CeO 2 on all the CuO-CeO 2 /SBA-15 catalysts are smaller than that of pure CeO 2 (0.5414 nm). 4,5 formation of new pores with smaller sizes probably due to the blockage of mesopores. 35,36 From Fig.…”

Influence of the Hydrothermal Parameters on the Physicochemical Characteristics of Cu−Ce Oxide Nanostructures

“…[54,71] Therefore, it is considered that the most dominant state of cerium in the obtained materials is the + 4 oxidation state. [71,73,74] According to the literature, the binding energy of Cu 2p 3/2 ranges at 943-935 eV, while the lower binding energy indicates the presence of Cu + species. The main peaks at 529.7-528.8 eV (O') are attributed to the lattice oxygen of the CeO 2 and CuO phase.…”