Change of Cu+ species and synergistic effect of copper and cerium during reduction-oxidation treatment for preferential CO oxidation

Engineering CuOx–ZrO2–CeO2 nanocatalysts with abundant surface Cu species and oxygen vacancies toward high catalytic performance in CO oxidation and 4-nitrophenol reduction

“…The lattice fringes related to ZrO 2 and CuO x cannot be observed in the above images, indicating that they have been highly dispersed over CeO 2 . 16 The elemental composition of the series of CZC samples was also analyzed by EDS measurement, and the results are summarized in Table S1, † which clearly demonstrated that the catalysts are composed of Ce, Cu, Zr and O elements. The obtained Zr/Ce and Cu/Ce ratios are intensely close to the expected values for each sample.…”

“…It was found that the oxygen vacancies on the CeO 2 surface play a vital role in oxygen activation and transfer, [13][14][15] while the highly dispersed Cu species can also act as the active centers for catalytic reactions. 4,16 However, the Cu species on the CeO 2 surface would tend to agglomerate under the conditions of overload or hightemperature calcination, and Cu + is easily oxidized to Cu 2+ , which is adverse for the adsorption and reaction of gas molecules in the catalytic process. 1,[16][17][18] Therefore, it is a meaningful study to improve the dispersion of Cu species and increase the number of active oxygen species in the CuO x -CeO 2 catalyst.…”

“…4,16 However, the Cu species on the CeO 2 surface would tend to agglomerate under the conditions of overload or hightemperature calcination, and Cu + is easily oxidized to Cu 2+ , which is adverse for the adsorption and reaction of gas molecules in the catalytic process. 1,[16][17][18] Therefore, it is a meaningful study to improve the dispersion of Cu species and increase the number of active oxygen species in the CuO x -CeO 2 catalyst. Recently, a ZrO x -CeO 2 binary compound has been employed as a catalyst for CO oxidation, and it was found that the addition of Zr species can increase the oxygen vacancies and the redox properties of CeO 2 .…”

Enhanced conversion of glucose to fructose over naturalattapulgite catalyst promoted by CeO2 in water

“…In our previous study, the natural mineral attapulgite (ATP) was selected as the catalyst for glucose isomerization and revealed a promising activity for the fructose yield, wherein the basicity and structure of ATP were important for the reaction in water [32] . Notably, cerium oxide (CeO 2 ) is one of the most important species in the rare earths and can be widely used as the catalyst for some reactions such as CO oxidation and methane combustion etc [35–36] . However, there are little researches on the resulting CeO 2 catalysts for glucose isomerization so far.Here, we reported an efficient CeO 2 /ATP catalyst prepared by simple impregnation method for glucose isomerization to fructose in water.…”

“…[32] Notably, cerium oxide (CeO 2 ) is one of the most important species in the rare earths and can be widely used as the catalyst for some reactions such as CO oxidation and methane combustion etc. [35][36] However, there are little researches on the resulting CeO 2 catalysts for glucose isomer-ization so far.Here, we reported an efficient CeO 2 /ATP catalyst prepared by simple impregnation method for glucose isomerization to fructose in water. The catalyst displayed an excellent catalytic activity comparable to ATP.…”