Surface reconstructions of LaCo1−xFexO3 at high temperature during N2O decomposition in realistic exhaust gas composition: Impact on the catalytic properties

Catalytic abatement of NO and N2O from nitric acid plants: A novel approach using noble metal-modified perovskites

“…Interestingly, Fig. 5a reveals a parallel increase of ln A with E app which could suggest an apparent compensation effect previously reported on LaCo 1Àx Fe x O 3 [14]. Strictly speaking, true Arrhenius parameters are required for verifying such a compensation effect [42] which means that true activation energy should be determined from rates where surface coverages are unlikely to change in the temperature range of this study.…”

“…The interest in the use of LaCoO 3 perovskite can be related to their peculiar properties developing specific surface after steam treatment at atmospheric pressure up to 800°C as shown by Choudhary et al [12]. However, at high temperature, significant surface reconstructions attributed to partial substitution of Co sites by Pd [13] or iron can occur [14] with the segregation of Co 3 O 4 . Incorporation of Rh has been previously envisaged for moderate-and high-temperature applications [15,16], especially for the decomposition of N 2 O propellant [17,18].…”

Palladium doped perovskite-based NO oxidation catalysts: The role of Pd and B-sites for NOx adsorption behavior via in-situ spectroscopy

“…6b) can be assigned to N=O , N-O and ␦ ONO vibrations of monodentate surface nitrites (-O-N=O), respectively [37][38][39][40]. The weak absorption bands at 1090 and 1194 cm −1 which are apparent only at the initial stage of NO 2 (g) exposure and disappear at higher exposures can be assigned to bridging and/or chelating nitrites [11]. The simultaneous growth of nitrate and nitrite species can be associated with the disproportionation of NO 2 on the perovskites surfaces: Fig.…”

“…The chemical properties of the perovskite materials are also known for their flexible characteristics which are associated with their A and/or B site substitution capabilities and availability of a wide variety of sub-stoichiometric structures [6]. The catalytic efficiencies of perovskite materials for NO and N 2 O reduction into N 2 were demonstrated by several studies [7][8][9][10][11][12][13]. Moreover, these materials play an efficient role in the catalytic NO oxidation under lean conditions even in the absence of a noble metal [14,15].…”

Anab initiocharacterization of the electronic structure of LaCoxFe1-xO3forx ≤ 0.5

“…In particular, we are focusing on LaCo x Fe 1− x O 3 due to its versatility and varied applications such as a perovskite‐based catalyst for the total oxidation of methane and as a catalytic precursor for the production of syngas . Also, LaCo x Fe 1− x O 3 is used in the catalytic decomposition of N 2 O at high temperatures , is the cathode material for intermediate temperature SOFCs , and, as a double perovskite (La 2 CoFeO 6 ) has recently been reported as having photocatalytic properties . In addition, it is a precursor of La y Sr 1− y Co x Fe 1− x O 3− δ used in the steam‐reforming of ethanol to produce hydrogen .…”