Metal-organic framework derived hollow CuO/CeO2 nano-sphere: To expose more highly dispersed Cu-O-Ce interface for enhancing preferential CO oxidation

Mechanistic Insight into Catalytic Combustion of Ethyl Acetate on Modified CeO2 Nanobelts: Hydrolysis–Oxidation Process and Shielding Effect of Acetates/Alcoholates

“…As the temperature rose (>200 °C), the role of the surface lattice oxygen (O latt ) became increasingly apparent, and thus, the significantly increased normalized peak areas after M modification were attributed to two reasons. First, more surface lattice oxygen was activated and available to interact with the adsorbed CO. Second, carbonate/bicarbonate species were continuously deposited onto the surfaces. − The lower normalized peak areas of the 5% Mn–CeO 2 NBs at high temperatures were due to the superior mobility of the surface lattice oxygen (Raman, XPS, and O 2 -TPD/H 2 -TPR results) that accelerated the decomposition of carbonates/bicarbonates. However, the accumulation of carbonates/bicarbonates on the 5% Cr–CeO 2 with the largest normalized peak areas after 250 °C primarily resulted from the increased surface acidity/basicity (Figure b,c) as well as the slow decomposition rate.…”

Photothermal CO-PROX reaction over ternary CuCoMnOx spinel oxide catalysts: the effect of the copper dopant and thermal treatment

“…CO preferential oxidation (CO-PROX) 1–3 is an important purification method to remove the trace CO in a hydrogen-rich gas to meet the application demands of proton exchange membrane fuel cells. In the past few decades, various kinds of catalysts such as noble metals Au 4,5 and Pt, 6,7 and non-noble metal oxides such as CuO/CeO 2 8–12 and Co 3 O 4 13,14 have been extensively studied in the thermal catalytic reaction of CO-PROX. However, the traditional thermal catalysis process requires inputting external thermal energy to activate the CO oxidation process and consumes a lot of fossil energy, which leads to severe environment problems and huge carbon emissions.…”

MOF-on-MOF heterojunction-derived Co3O4–CuCo2O4 microflowers for low-temperature catalytic oxidation

“…The effect of H 2 O on the reversibility of the catalyst was also tested (Fig. S19b, ESI†), 12,13 and it was shown that the conversion rate of CO increased rapidly to nearly 100% after introducing water vapor, but with the continuous input, the CO conversion decreased and finally remained at about 55%. After the withdrawal of water vapor, the conversion efficiency of CO gradually increased to 80% and remained stable.…”

“…S21, ESI†), where the first desorption peak below 250 °C belonged to surface reactive oxygen that adsorbed on the oxygen vacancies formed by inter copper and cobalt interactions. 13 The following desorption peak in the range of 250–700 °C was assigned to the adsorption of oxygen defects on Co 3 O 4 –CuCo 2 O 4 . The relative front of the emerging peak position of Co 3 O 4 –CuCo 2 O 4 indicates that the hybridized microflower was prone to forming oxygen defects.…”