Tuning SnO2 surface with CuO for soot particulate combustion: The effect of monolayer dispersion capacity on reaction performance

Superscalar Phase Boundaries Derived Multiple Active Sites in SnO2/Cu6Sn5/CuO for Tandem Electroreduction of CO2 to Formic Acid

“…To confirm the stability of Cu 6 Sn 5 /oxides during CO 2 RR, its surface properties of Cu 6 Sn 5 /oxides and contrast samples (CuO, SnO 2 , and Cu 6 Sn 5 ) were further analyzed by Raman spectroscopy in the spectral range of 100–1000 cm −1 , as shown in Figure S19, Supporting Information. The typical Raman peaks of CuO and SnO 2 were at 292 and 625 cm −1[ 26 ] and at 209 and 570 cm −1 , [ 27 ] respectively, which were observed in Cu 6 Sn 5 /oxides. In particular, the change of Raman signal on the catalyst surface was examined by the dropwise addition of Cu 6 Sn 5 /oxides onto the silicon wafer for CO 2 RR (Figure S20, Supporting Information), and there was no significant changes in peak positions and intensities of Cu 6 Sn 5 /oxides during the CO 2 RR process for 2 h. The in situ Raman result strongly confirmed the stability of CuO and SnO 2 during the CO 2 RR.…”

Identifying Surface Active Sites of SnO2: Roles of Surface O2–, O22– Anions and Acidic Species Played for Toluene Deep Oxidation

“…Although surface lattice oxygen species might also be active and involved in the reaction, it has been commonly agreed that the surface electrophilic oxygen species could be more critical to the reaction. , Therefore, the (O 2 2– + O 2 – )/O 2– molar ratio has thus been quantified for each sample in Table , which reflects the abundance of surface facile oxygen species. Apparently, the surface (O 2 2– + O 2 – )/O 2– molar ratio improves in the sequence SnO 2 -Pre < SnO 2 -Mic < SnO 2 -Stir-OH < SnO 2 -Ultra-OH, obeying the same order for O 2 -TPD, H 2 -TPR, and the activity evaluation results.…”

“…Although surface lattice oxygen species might also be active and involved in the reaction, it has been commonly agreed that the surface electrophilic oxygen species could be more critical to the reaction. 37,54 3.9. Sulfur and Water Vapor Resistance Test.…”

“…Our group has been performing systematic research on SnO 2 catalysis over the past nine years for different reactions. − It is discovered that the abundance and mobility of the surface deficient oxygen anions are very important for the catalytic activity, whereas for pure SnO 2 , the surface deficient oxygen sites can be depleted almost completely due to the improved crystallinity after calcination above 300 °C . However, it is observed that by doping a secondary metal cation, such as Nb 5+ , Cu 2+ , Ce 4+ , Cr 3+ , and Mn 3+ , into the SnO 2 matrix to form a noncontinuous solid solution structure, the quantity of the surface deficient oxygen species can be enhanced and its thermal stability can be improved. − Even if the prepared SnO 2 -based solid solution catalysts were calcined above 450 °C, a certain quantity of surface deficient oxygen anions can still be detected, which contribute significantly to their activity for CO oxidation; methane, VOC, and soot combustion; , and NOx selective reduction by NH 3 .…”

Efficient electrocatalytic reduction of CO2 to CO via mechanochemical synthesized copper-based composite metallic oxide catalyst

“…Except for the Sn-In-CuO sample, both CuO and Sn-CuO samples exhibit two distinct reduction peaks in the region below 300 ℃. The α peak (T 1 ) corresponds to the reduction of CuO with smaller particle size, while the β peak (T 2 ) corresponds to the reduction of CuO with larger particle size [39,40] . It can be observed that the addition of Sn does not cause signi cant changes in the reduction peak of CuO.…”