Probing the surface active sites of Ce1−xNixO2-δ for catalytic reduction of NO

Resolving a structural issue in cerium-nickel-based oxide: a single compound or a two-phase system?

“…32–39 These studies were mostly used for hydrogen production via water splitting 35 and as catalysts for the reduction of NO 40 or unsaturated organic compounds. 34,36,41 A similar application has also been reported for the “CeNiO 3 ” perovskite. 20,22–24,26…”

“…[32][33][34][35][36][37][38][39] These studies were mostly used for hydrogen production via water splitting 35 and as catalysts for the reduction of NO 40 or unsaturated organic compounds. 34,36,41 A similar application has also been reported for the "CeNiO 3 " perovskite. 20,[22][23][24]26 Therefore, it is important to elucidate the actual structure of what the literature claims to be CeNiO 3 so that the structure-property relationship is established.…”

“…Several other authors have studied Ce 1−x Ni x O 2−δ for various catalytic applications. 33,41,71,72 Barrio et al 33 even reported that the limit of the solubility of Ni in ceria ranges from 10 to 12 mol%, even though they did not give information on the Ce 1−x Ni x O 2−δ unit cell content. These values were calculated from the difference in the NiO content; they assumed that the remaining Ni was dissolved in CeO 2 .…”

Unveiling the Mechanistic Significance of Reducibility and Lattice Oxygen Evolution in the Ce1–x–yZrxNiyO2−δ Catalyst for Methanol Electro-Oxidation

“…The Ce 3d core-level spectra of all oxides exhibited a total of 10 peaks, as depicted in Figure a. The first five peaks, labeled as “ v ,″ correspond to the Ce 3d 5/2 level, while the subsequent five peaks, labeled as “ u ,″ correspond to the spin–orbit splitting of Ce 3d 3/2 . − The peaks at 900.0 and 918.7 eV labeled as v ‴ and u ‴ are the characteristic Ce 4+ peaks corresponding to the Ce 3d 9 4f 0 O2p 6 final state configuration. The doublets at 884.4 and 904.8 labeled as v – u correspond to the Ce 3d 9 4f 2 O2p 4 configuration, whereas peaks at 891.0 and 911.4 eV ( v ″– u ″) also correspond to the Ce 3d 9 4f 1 O2p 5 final states of the Ce 4+ oxidation state. , Peaks at binding energies of 880.5–902.8 and 887.7–909.4 eV labeled as v o – u o and v ′– u ′, respectively, correspond to the Ce 3d 9 4f 2 O2p 5 and Ce 3d 9 4f 1 O2p 6 final states of the Ce 3+ oxidation state.…”

Rags to Riches: Meliorating the Electrocatalytic Reduction of Nitrate to Ammonia over Cu-Based Nanoalloys

“…Due to the excessive industrial effluents, human sewage, and nitrogenous fertilizers from the agricultural sector, the concentration of gaseous NO x in the environment and nitrate salts in the groundwater is considerably rising. This has caused serious global environmental problems, leading to health concerns, which is a major issue. − The current situation demands the development of an energy-efficient process that can convert gaseous NO x and nitrate into a useful and efficient product. NO x and nitrate are sources of nitrogen and can be used to produce back to the fertilizer ammonia.…”