In situ structural changes during toluene complete oxidation on supported EuCoO3 monitored with 151Eu Mössbauer spectroscopy

Spectroscopic Investigation of Iron Substitution in EuCoO3: Related Impact on the Catalytic Properties in the High-Temperature N2O Decomposition

“…The stabilization of ad-NO x species is highlighted after catalytic reaction by an additional contribution above 532.0 eV . The overall surface composition summarized in Table emphasizes the accumulation of N-containing species as well as a surface Eu enrichment by comparing, respectively, the atomic N/Eu and Co/Eu ratios irrespective of the thermal treatment procedure, as reported elsewhere …”

“…Previous authors have already reported the potential interest of europium-based perovskites in the catalytic oxidation of toluene. 6 Partial replacement of Co by Eu induces a rate enhancement in methane combustion 7,8 ascribed to structural effects because Eu incorporation leads to a decrease in the Goldschmidt tolerance factor, increasing the reducibility of the cations located in the B site. As a matter of fact, 151 Eu as a probe photoluminescent element can be useful for visualizing local structural changes.…”

“…20 The overall surface composition summarized in Table 3 emphasizes the accumulation of N-containing species as well as a surface Eu enrichment by comparing, respectively, the atomic N/Eu and Co/Eu ratios irrespective of the thermal treatment procedure, as reported elsewhere. 6 XPS analyses on EuFeO 3 are collected in Figure 3. Fe 2p 3/2 photopeak on EuFeO 3 located at 710.2 eV characterizes the presence of Fe 2+ cations, with satellite structure at 714.5 eV, likely stabilized as Fe 3 O 4 .…”

Recent Advances in the Catalytic Oxidation of Volatile Organic Compounds: A Review Based on Pollutant Sorts and Sources

“…These issues can be avoided to an extent, by targeting the synthesis of porous perovskite materials or by immobilization of these phases onto high surface area supports. 308,474 Dai and co-workers 310,[475][476][477][478] prepared a series of perovskite oxides with meso-or macroporous structures and tested them for total oxidation of toluene. The porous perovskite materials exhibited significantly higher surface areas and better low temperature reducibilities.…”

“…Given that the activity of total oxidation catalysts is often highly dependent on a material’s surface area, this somewhat limits the application of perovskites in this field. These issues can be avoided to an extent, by deliberately targeting porous perovskite materials or by immobilization of these phases onto high-surface-area supports. , Dai and co-workers ,− prepared a series of perovskite oxides with meso- or macroporous structures and tested them for the total oxidation of toluene. The porous perovskite materials exhibited significantly higher surface areas and better low-temperature reducibilities.…”