Effect of NO2 and water on the catalytic oxidation of soot

Abstract

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Hydrocarbon and Soot Oxidation over Cerium and Iron Doped Vanadium SCR Catalysts

“…For the soot oxidation tests, the soot (20 mg, carbon black from Alfa Aesar) and the catalyst (80 mg, 125–250 μm) samples were mixed together with a spatula, resulting in a loose contact [12a,43] . The reactor was heated up to 600 °C in 10 % O 2 /N 2 (100 mL/min) with a temperature ramp of 10 °C/min.…”

Niobium oxide promoted with alkali metal nitrates for soot particulate combustion: elucidating the vital role of active surface nitrate groups

“…Many earlier studies have demonstrated that surface active oxygen species are of great importance for soot oxidation, 73,74 which generally functions through a Mars–van-Krevelen mechanism. On Nb 2 O 5 , LiNb1-9 and NaNb1-9, the samples present no active oxygen species, hence it takes high temperatures (>500 °C) to initiate the soot combustion reaction.…”

“…67,68 Indeed, the presence of NO 2 − directly proves that NO 3 − is involved in the reaction, which is reduced to NO 2 − by soot particles, before being regenerated by gas-phase O 2 through the Mars–van-Krevelen pathway. 73,74…”

Metallic Ag Confined on SnO2 Surface for Soot Combustion: the Influence of Ag Distribution and Dispersion on the Reactivity

“…Indeed, the in-situ DRIFTS results match well the Raman findings, validating the existence of both active superoxide (O 2 À ) and peroxide (O 2 2À ) sites on the catalyst surface. For soot combustion, many previous investigations have proved that it follows a Mars-van-Krevelen (MVK) mechanism, [34] hence the surface active oxygen species can affect the reaction performance significantly. Therefore, XPS O 1s signals of the samples have been analyzed here.…”