AFeO3 (A=La, Nd, Sm) and LaFe1−xMgxO3 perovskites as methane combustion and CO oxidation catalysts: structural, redox and catalytic properties

Reduction kinetics of lanthanum ferrite perovskite for the production of synthesis gas by chemical-looping methane reforming

“…A small amount of Fe 4 þ in the perovskite can be reduced to Fe 3 þ ( $ 0.054 mmol/g) at low temperature ( $ 680 K) in H 2 -TPR (Fig. S1D) (Ciambelli et al, 2001;Chen et al, 2013), which can be further reduced into Fe 2 þ (0.185 mmol/g), declaring a limited reducibility of Fe 3 þ ions in perovskite structure, further confirmed by XRD characterization due to the absence of new phase (Fig. 1).…”

“…1). For the peak within low temperature ( $ 680 K), although there are controversies about the reduction of Fe 4 þ or the iron species on the surface and the removal of surface oxygen (Ciambelli et al, 2001;Chen et al, 2013;Velichkova et al, 2013), the nonstoichiometric composition contains oxygen vacancies that can be filled up is the only reason for the presence of In order to decide the relationship between the structure and available oxygen, the combination of CH 4 -TPSR, XRD and XPS characterization was used to explore the losses of oxygen species, catalyst structure and surface state. In CH 4 -TPSR, the main products are CO and H 2 , while only small amounts of CO 2 and H 2 O are detected in Fig.…”

Dynamic Behavior of Pd Species in an LaFe0.95Pd0.05O3 Perovskite

“…The weak peak at 529 K represented the reduction of a small amount of Fe 4? , which was generated to compensate for charge imbalance on Pd doping [14,17]. The two minor peaks at 617 and 715 K corresponded to the reduction of Fe 3?…”

Peculiarities of LaFeO3 nanocrystals formation via glycine-nitrate combustion

“…Lanthanum orthoferrite, due to its wide prevalence in comparison with other rare-earth elements (REE) and its particular property set, is the basis for many functional materials applied in catalysis, solid-oxide fuel cells, chemical sensors, magnetic and electrode devices etc. [2][3][4][5][6][7][8][9]. Lately, materials based on LaFeO 3 are also considered as promising materials to obtain hydrogen by the photocatalytic decomposition of water under visible light irradiation [10][11][12].…”