Mesoporous Ni/Ce1−xNixO2−y heterostructure as an efficient catalyst for converting greenhouse gas to H2 and syngas

A heterostructure of highly dispersed Ni nanoparticles in pore channels of Ni–CeO₂ solid solution, having excellent thermo-stability, redox properties, and metal/support synergy, is identified as an efficient nanocatalyst for converting greenhouse gas into H₂ energy and syngas.

In situ fabrication of Ce1−xLaxO2−δ/palygorskite nanocomposites for efficient catalytic oxidation of CO: effect of La doping

Novel palygorskite (PG) supported Ce_1−xLa_xO_2−δ nanocomposites were prepared by a facile in situ deposition method for efficient catalytic oxidation of CO and the effect of La doping was evaluated.

Combined DFT and experimental study of the dispersion and interaction of copper species in Ni-CeO2 nanosized solid solutions

Nanosized nickel (Ni) and copper (Cu) doped ceria (CeO₂) have attracted attention as solid solutions for energy- and environment-related applications.

Low-temperature CO oxidation over manganese, cobalt, and nickel doped CeO2 nanorods

Transition metal doped ceria nanorods exhibit a better CO oxidation activity at lower temperatures.

Oxygen vacancies on nanosized ceria govern the NOxstorage capacity of NSR catalysts

The oxygen vacancies on Pt/BaO/CeO₂govern the NO_xstorage capacity by creating efficient sites or channels for nitrate formation and its further transformation to Ba-based storage sites.

Nanoparticles-in-concavities as efficient nanocatalysts for carbon dioxide reforming of methane to hydrogen and syngas

The ceria concavity-loaded Ni nanoparticle catalysts can lead to more active sites and promote CO₂ dissociative activation and CO desorption, thus enhancing significantly the catalytic performances for methane dry reforming with CO₂.

The Effect of Exposed Facets of Ceria to the Nickel Species in Nickel-Ceria Catalysts and Their Performance in a NO + CO Reaction

CeO2 rods with {110} facets and cubes with {100} facets were utilized as catalyst supports to probe the effect of crystallographic facets on the nickel species and the structure-dependent catalytic performance. Various analysis methods (ex and in situ XRD, TEM, Raman, XPS, TPR, TPD) were used to investigate the structural forms of the catalysts, and these results indicated that the deposition of nickel species resulted in the formation of two main active types of the catalyst components: NiO strongly or weakly interacted with the surface and Ni-Ce-O solid solution. Notably, the states and distribution ratio of nickel species were related to the shape of CeO2. It was found that CeO2 rods had more active sites to coordinate with nickel species to form a strong interaction with NiO on the surface and a more stable construction when compared to cubes. Furthermore, the nickel-ceria catalysts with rod shape were more active towards NO oxidation with complete conversion below 191 °C, but for cube shape, complete conversion occurred above 229 °C (e.g., for nickel loading of ∼5%, the complete conversion temperature was 154 °C for the rod shape and 229 °C for the cube shape). On the basis of the analysis of the catalysts structure, the superior catalytic activity was due to a combination of surface structures of NiO (mainly strongly interacting with the surface) and nickel ions Ni(2+) in the Ni-Ce-O bulk phase.

Size-controllable Ni5TiO7 nanowires as promising catalysts for CO oxidation

Ni₅TiO₇ nanowires with controllable sizes are synthesized using PEO method combined with impregnation and annealing at 1050^oC in air, with adjustment of different concentrations of impregnating solution to control the dimension of nanowires. The resulting nanowires are characterized in details using X-ray diffraction, scanning electron microscopy, transmission electron microscopy and energy dispersive X-ray analysis. In addition, the CO catalytic oxidation performance of the Ni₅TiO₇ nanowires is investigated using a fixed-bed quartz tubular reactor and an on-line gas chromatography system, indicating that the activity of this catalytic system for CO oxidation is a strong dependency upon the nanocrystal size.When the size of the Ni₅TiO₇ nanowires is induced from 4 μm to 50 nm, the corresponding maximum conversion temperature is lowered by ~100 ^oC.

High oxygen storage capacity and enhanced catalytic performance of NiO/NixCe1−xO2−δ nanorods: synergy between Ni-doping and 1D morphology

NiO/Ni-doped ceria nanorods have been synthesized. Their unique structure combines specific composition and 1D morphology, which provide great improvements in their physical chemical properties.

Engineering the NiO/CeO2 interface to enhance the catalytic performance for CO oxidation

In this work, NiO/CeO₂ catalysts were synthesized with tunable CeO₂ crystal facets ({110}, {111} and {100} facets) to study the crystal-plane effects on the catalytic properties.

Single-phase nickel-doped ceria cathode with in situ grown nickel nanocatalyst for direct high-temperature carbon dioxide electrolysis

In situ growth of Ni nanocatalysts on CeO₂ surface has been achieved and the direct carbon dioxide electrolysis reaches high efficiencies using this material as cathode.