Narrow Results

A facile strategy is described for general synthesis of MCo₂O₄@CeO₂ ($\mathrm{\text{M}}=\mathrm{\text{Ni}}$, Cu, Zn, Mn) core@shell nanospheres. First, uniform M,Co–glycerate were prepared and served as precursor to produce MCo₂O₄ spheres by calcination, followed by a reflux process to obtain MCo₂O₄@CeO₂ core@shell spheres. As expected, due to the synergetic effect at the interface between the two components, most of the as-prepared MCo₂O₄@CeO₂ core@shell spheres exhibited enhanced catalytic activities toward CO oxidation compared with the corresponding MCo₂O₄ spheres and CeO₂ nanoparticles.

In this paper, two Au/CeO₂ catalytic systems have been fabricated through the synthesis of porous CeO₂ from Ce-BTC MOFs nanorod and nanobundle precursors by thermal annealing, and the subsequent Au loading. Significantly, the catalytic activity of Au/CeO₂ nanorods is higher than that of bare CeO₂ and even Au/CeO₂ nanobundles for both CO oxidation and 4-nitrophenol reduction. The remarkably enhanced performance of Au/CeO₂ nanorods can be attributed to the unique porous structure, high surface area, abundant oxygen vacancies on the surface of CeO₂, and the synergistic effect between gold and ceria.

In this paper, the oxidation mechanism of carbon monoxide (CO) on two-dimensional porphyrin sheet within a single cobalt atom (Co-TDPs) was studied by density functional theory with dispersion (DFT-D). The stability of Co-TDPs at different temperatures was verified by first-principle molecular dynamics simulations. Absorption energies of reactant and product to anchor to the Co–N₄ site showed CO and O₂ adsorption to be stronger than the CO₂ adsorption. In addition, the Langmuir–Hinshelwood, Eley–Rideal (ER), and ter-molecular Eley–Rideal (TER) mechanisms were used to investigate the reaction mechanisms of CO oxidation on Co-TDPs. The Langmuir–Hinshelwood (LH) and ER mechanisms were feasible reaction profiles of CO oxidation because of their smaller energy barrier. The results suggested that the Co-TDPS was acting as a catalyst for CO oxidation in the mild condition.