On the surface-dependent oxidation of Cu2O during CO oxidation: Cu2+ is more active than Cu+

Hierarchical Porous Carbon Nitride-Crumpled Nanosheet-Embedded Copper Single Atoms: An Efficient Catalyst for Carbon Monoxide Oxidation

“…8 However, most of the discussed previous reports have focused on using Cu or Cu-oxide nanoparticles without much emphasis on the atomic doping effect or single atoms. 6,9 Ubiquitously, the exposed atoms on the surface of Cu nanoparticles serve as active catalytic sites; meanwhile, the inner atoms are spectators, which devalue the catalytic activity. Likewise, the ease of oxidation feasibility of Cu nanoparticles [i.e., Cu(0) to Cu (I) or Cu(II)] in oxygen-rich atmospheres remains a daunting challenge that precluding commercial utilization of Cu-based catalysts for CO Ox .…”

Hierarchical N-Doped CuO/Cu Composites Derived from Dual-Ligand Metal–Organic Frameworks as Cost-Effective Catalysts for Low-Temperature CO Oxidation

“…Generally, in metal oxides, Cu + had better CO catalytic activity than Cu 2+ , and the activity of the catalysts was evaluated by the fraction of Cu + (Cu + /(Cu + + Cu 2+ )). The larger the fraction of Cu + , the better the catalytic effect was . The ratio of Cu + was calculated from the ratio of the area of the Cu + peak to the main Cu 2p 3/2 peak, the fractions of Cu + (Cu + /(Cu + + Cu 2+ )) in the three catalysts were 0.54, 0.49, and 0.49, respectively, indicating that N-doped CuO/Cu had a better CO catalytic effect.…”

“…The larger the fraction of Cu + , the better the catalytic effect was. 53 The ratio of Cu + was calculated from the ratio of the area of the Cu + peak to the main Cu 2p 3/2 peak, the fractions of Cu + (Cu + /(Cu + + Cu 2+ )) in the three catalysts were 0.54, 0.49, and 0.49, respectively, indicating that N-doped CuO/Cu had a better CO catalytic effect. Oxygen properties were analyzed in detail through the O 1s spectra.…”

New insights into the influence mechanism of H2O and SO2 on Pt–W/Ti catalysts for CO oxidation

“…The commonly used catalysts for CO oxidation are divided into noble metal catalysts such as Pt, 7,8 Au, 9–12 Pd, 13 Ag, 14 Ru, 15 Rh, 16 and Ir (ref. 17) and transition metal catalysts such as Cu, 18–21 Co, 22–25 and Mn. 26,27 In the reaction atmosphere (CO and O 2 ), the noble metal catalysts commonly show a higher CO catalytic activity than transition metal catalysts, whereas the drawback of high cost is a major limit for their wide applications.…”