High-stable CuPd–Cu2O/Ti-powder catalyst for low-temperature gas-phase selective oxidation of alcohols

CuCeOx/VMT powder and monolithic catalyst for CO-selective catalytic reduction of NO with CO

“…As mentioned above, the peak of 933.3 eV indicates the appearance of Cu 2+ species, which is the main copper species in the sample, whereas the peak of 930 eV corresponds to the low-valent copper species (Cu + ), indicating that Cu + is formed during the catalyst synthesis process. 34 Compared with the other three samples, the Cu 2p 3/2 peak of the CuCe/VMT(M) sample moved in the direction of lower binding energy, and the satellite peaks showed a weakening trend. The peak intensity and peak area of the Cu + species characteristic peak in Cu 2p 3/2 increased significantly, indicating that the muffle furnace-calcined precursor can promote the formation of low-valence copper species and further improve the reactivity.…”

Selective Synergistic Catalytic Elimination of NOx and CH3SH via Engineering Deep Oxidation Sites against Toxic Byproducts Formation

“…After being treated by CH 3 SH and O 2 , the proportion of low-valent Cu species increases from 49.8 to 51.3% over CNF/T, indicating that low-valent Cu species participate as reactive sites in the oxidation of CH 3 SH. Auger Cu LMM spectra are conducted and confirm the presence of Cu + over fresh CNF/T (Figure b). , The decrease of Cu 2+ within the Cu LMM region over the treated CNF/T manifests the reduction of Cu 2+ again (Table S5). Meanwhile, the peak around 570.2 eV assigned to Cu + is still preserved after the treatment, indicating that Cu 2+ is reduced to Cu + mostly .…”

“…Auger Cu LMM spectra are conducted and confirm the presence of Cu + over fresh CNF/T (Figure 4b). 34,35 The decrease of Cu 2+ within the Cu LMM region over the treated CNF/T manifests the reduction of Cu 2+ again (Table S5). Meanwhile, the peak around 570.2 eV assigned to Cu + is still preserved after the treatment, indicating that Cu 2+ is reduced to Cu + mostly.…”

Probing Active Sites in CuxPdy Cluster Catalysts by Machine-Learning-Assisted X-ray Absorption Spectroscopy

“…First, our hypothesis for identifying a highly active and selective catalyst is based on the exploitation of a potential symbiotic effect of a highly active Pd and a more selective Cu component. Second, these materials are chosen as part of the search of affordable replacement for the precious metals in part or in entirety, as demonstrated for example in refs. , In structural studies of size-selected clusters deposited on flat support, grazing incidence XANES (GIXANES) has been shown to contain information about the clusters’ structure, oxidation states and their changes in reaction conditions . GIXANES data analysis was limited, until recently, to the linear algebra methods, such as linear combination analysis with experimental standards.…”