Promotion of Pt/CeO₂ catalyst by hydrogen treatment for low-temperature CO oxidation

Abstract

Understanding on effects of Pt size and oxygen vacancy at CeO2 surface in Pt/CeO2 catalyst for CO oxidation reaction enables to boost catalytic activity.

Towards the Effect of Pt0/Ptδ+ and Ce3+ Species at the Surface of CeO2 Crystals: Understanding the Nature of the Interactions under CO Oxidation Conditions

“…O‐vacancy defects on the CeO 2 structure and its reducibility properties play a key role in the catalytic performance of various chemical transformations [12,30–32] . In this context, the pure CeO 2 nanocubes and nanowires and Pt/CeO 2 nanocubes and nanowires catalysts were investigated by temperature‐programmed reduction (H 2 ‐TPR) to gain further insights into these properties.…”

“…The experiments were also performed with the as‐prepared (Figure 4a) and ex‐situ reduced samples (Figure 4c). However, one may bear in mind that changes in oxidation states can occur under air conditions (which are different from the in situ reduced samples) since Ce +4 is more stable in air, [12] and cannot reflect the real state of the reduced species. Such analyzes presented 10 peaks curve‐fitted in 5 doublets, showing one additional doubled peak corresponding to Ce 3+ species ( v’ and u’ ) [62] .…”

“…In this respect, due to noble‐metals high market prices, great efforts are being put into preparing efficient high‐surface‐area clusters/single‐atoms with low metal content [9] . While high metallic dispersion offers more adsorption sites, some authors consider that the decrease in particles′ size promotes an augment on the CO binding strength, which poisons Pt sites [10–12] . In contrast, other studies suggest that corner atoms on Pt NPs or isolated single‐atoms are highly active for CO oxidation [13,14] .…”

Doping Manganese Oxides with Ceria and Ceria Zirconia Using a One-Pot Sol–Gel Method for Low Temperature Diesel Oxidation Catalysts

“…A study carried out by Jan et al [19] reported CO lightoff at approximately 543 K, over a Pt (0.5 atomic %) CeO 2 catalyst prepared by co-precipitation method. Another study carried out by Bera et al [5] also reported CO light-off at around 453 K, over a 1 wt% Pt CeO 2 catalyst prepared using a solution combustion method.…”

Platinum‐Decorated Ceria Enhances CO2 Electroreduction in Solid Oxide Electrolysis Cells

“…Obviously,the ratio of Ce 3 + to total Ce species rises from 0.12 to 0.17 after decorating Pt nanoparticles on SDC surface, which also suggests that the oxygen vacancy concentration is increased after the construction of Pt/ SDC interfaces. [17] The XPS spectra of Sm 3d stay almost unchanged, suggesting that the chemical state of Sm on SDC surface remains unchanged after the decoration of Pt nanoparticles. H 2 temperature-programmed reduction (H 2 -TPR) profileso f SDC and SDC-x Pt samples ( Figure 3b)a gree well with the results of XPS.…”