Yolk-shell-like mesoporous CoCrOx with superior activity and chlorine resistance in dichloromethane destruction

Facet control of manganese oxides with diverse redox abilities and acidities for catalytically removing hazardous 1,2-dichloroethane

“…6, the 18 O 16 O curve increases in the range of 200 to 400 o C, but it can hardly be observed in the 16 O 2 formation, which is conducive to the predominant participation of oxygen atoms, corresponding to the Route (2). The further rise of the temperature leads to an enhancement of the 18 O 16 O uptake accompanied by 16 O 2 production (400 to 600 o C).…”

“…7b), which can acquire the discrepancy in oxygen mobility ability over these catalysts further. During the experimental temperature window, the maximum exchange rate (R emax ) value emerges when the gas-solid phase balance of 18 O amounts is achieved, thus the behavior of each catalyst could be contrasted by the starting exchange temperature where the concrete value of R emax is, that is the lower the starting 17 As displayed in Fig. S2, the chlorinated organic byproducts, including C 2 H 3 Cl, C 2 H 2 Cl 2 , 1,1,2-C 2 H 3 Cl 3 and CCl 4 , are hardly observed on α-and γ-MnO 2 , but these chlorinated byproducts are readily formed over β-and δ-MnO 2 , especially on δ-MnO 2 , resulting that HCl yield presented an inflection point at 400 o C, which indicates that the occurrence of not only hydrochlorination but also polychlorination during the overall combustion process.…”

“…Fig.7b, the mobility behavior of reaction oxygen species is ranked as follows: γ-(310o C) > δ-(360 o C) > β-(380 o C) > α-MnO 2 (440 o C).It is verified that γ-MnO 2 has the most excellent ability on mobility of oxygen species that could be related to its abundant oxygen vacancies to yield the corresponding reactive oxygens. Actually, the formation of reaction oxygen species demands unequal activation energies in the process of isotopic18 O exchange. Interestingly, the γ-MnO 2 and β-MnO 2 have the second extreme point, which likely presented the exchange with some lattice oxygens in bulk.…”

Insights into the role of strontium in catalytic combustion of toluene over La1−xSrxCoO3 perovskite catalysts

“…3, two main reduction peaks were observed for the LC sample. The reduction peak at 427 1C was attributed to the reduction of Co 3+ to Co 2+ and the reduction of surface adsorbed oxygen species, 30,31 and the reduction peak at 606 1C belongs to Co 2+ reduction to Co and the reduction of the lattice oxygen species. 25,32 Interestingly, with the increase of the doped amount of Sr in the LaCoO 3 perovskite, the reduction peak shifts to a low temperature.…”

Non-Thermal Plasma-Modified Ru-Sn-Ti Catalyst for Chlorinated Volatile Organic Compound Degradation

“…Among them, catalytic combustion is considered to be a promising technique due to its high activity, high selectivity, good stability, and low energy consumption. Recently, transition metal oxides loaded with noble metal oxides have gained wide attention due to their high catalytic activities, superb resistance against chlorine-poisoning, and strong stability [14][15][16]. However, the catalysts synthesized by the conventional calcination method were reported to lack oxidation activity in low temperatures.…”