Significant Enhanced SO₂ Resistance of Pt/SiO₂ Catalysts by Building the Ultrathin Metal Oxide Shell for Benzene Catalytic Combustion

Constructing a core–shell Pt@MnOx/SiO2 catalyst for benzene catalytic combustion with excellent SO2 resistance: new insights into active sites

“…Based on our previous work, this result indicates that the Mn element is redispersed on the catalyst surface, which is related to charge transfer between Pt &+ and Mn &+ . 81 In addition, after the reaction, the content of Mn 2+ and Mn 3+ decreased by 3.79% and 4.56% respectively, and the content of Mn 4+ increased sharply by 8.35%. This means that Mn 2+ has been oxidized (Mn 2+ − e − → Mn 3+ , Mn 3+ − e − → Mn 4+ ).…”

Chlorobenzene Oxidation over Phosphotungstic-Acid-Coated Cerium Oxide: Synergistic Effect of Phosphotungstic and Cerium Oxide and Inhibition Mechanism of Sulfur Dioxide

“…Figure 9b shows that only two distinct bands at 1477 and 1630 cm −1 appear in the sulfated HPW/CeO 2 spectrum after CB adsorption. The band at 1477 cm −1 was attributed to the stretching vibration of the C=C bond in CB adsorbed on Brønsted acid sites due to Ce-OH in CeO 2 and W-OH in HPW [9], while that at 1630 cm −1 was ascribed to the stretching vibrations of the C=C bond in CB adsorbed on the sulfated species [46]. However, compared with the in situ DRIFTS spectrum of CB adsorption onto HPW/CeO 2 (Figure 6a), the bands at 1445, 1581, and 1625 cm −1 corresponding to the Brønsted acid sites due to Ce-OH in CeO 2 , Lewis acid sites due to Ce 3+ /Ce 4+ species in CeO 2 , and Lewis acid sites due to W 6+ species in HPW for CB adsorption all disappeared.…”