Insight into the mesoporous Fe Ce1−O2− catalysts for selective catalytic reduction of NO with NH3: Regulable structure and activity

Hydrogenation of biomass-derived compounds containing a carbonyl group over a copper-based nanocatalyst: Insight into the origin and influence of surface oxygen vacancies

“…4B, there are two fitted peaks in the spectra of O1s regions, O I and O II , representing two different kinds of oxygen species. The peak at a lower binding energy of 530.7 eV is characteristic of the lattice oxygen bound to metal cations in the spinel structure [66]; the other at 532.3 eV is mainly assigned to surface-adsorbed oxygen species on oxygen vacancies belonging to defect-oxide and surface hydroxyl-like groups adsorbed on metal ions [66][67][68][69]. Correspondingly, the intensity ratio O II /O I can qualitatively estimate the relative abundance of surface oxygen vacancies to some extent.…”

Silicotungstic acid modified Ce‐Fe‐Ox catalyst for selective catalytic reduction of NOx with NH3: Effect of the amount of HSiW

“…Because the oxidation process from NO to NO 2 was carried out over Fe 3+ sites in SCR process . Moreover, the existence of Fe 3+ exhibited a positive effect on providing medium acid sites and active Fe 3+ could be a key point that participated in the reversible redox cycle of SCR reaction, which improved catalytic preformance . Combined with Figure , the results confirmed that Cat‐4 showed the best deNO x activity.…”

Effectively promoted catalytic activity by adjusting calcination temperature of Ce‐Fe‐Ox catalyst for NH3‐SCR

“…reported that the high ratio of Ce 3+ and Fe 3+ was caused by the strong interaction between Fe and Ce species, while Fe 3+ /Fe 2+ redox could promote Ce 4+ /Ce 3+ redox through the redox equilibrium of Fe 2+ +Ce 4+ ↔Fe 3+ +Ce 3+ . It was reported that the redox reaction could enhance the ratio of Ce 3+ , Fe 3+ and O α , which were beneficial for increasing the low‐temperature activity. Thus, more concentrations of O α , Ce 3+ , Fe 3+ and sulfate species were obtained over CF‐450 catalyst, which might be due to the synergetic effects among Fe species, SO 4 2− and Ce species.…”

“…Shu etal reported that the doping of Fe‐Ce‐O x into TiO 2 catalyst could promote the resistance to SO 2 poisoning. Wang etal demonstrated that the addition of Fe into CeO 2 could significantly enhance the SCR activity due to the electronic inductive effect between Fe 3+ and Ce 4+ , resulting in an increase in redox ability and the amounts of acid sites. In our previous study, we found that the SCR activity an N 2 selectivity of Fe‐Ce‐O x was affected by the state of SO 4 2− and Fe species .…”