Porous LaFeO₃ perovskite catalysts synthesized by different methods and their high activities for CO oxidation

Abstract

In this study, spherical α-Fe2O3 prepared by the hydrothermal method was used as a template for the first time; LaFeO3 perovskite catalysts were successfully synthesized by the molten salt method, sol–gel method, and co-precipitation method.

Exploring Reversible Redox Behavior in the 6H-BaFeO3−δ (0 < δ < 0.4) System: Impact of Fe3+/Fe4+ Ratio on CO Oxidation

“…This can be achieved through hard casting, using templates such as mesoporous silica 8 or poly(methyl methacrylate) nanospheres, 3 or by nanostructuring of precursors, e.g., from macroporous Fe 2 O 3 . 9 The effect of partial or total substitution of lanthanum with other cations has also been evaluated. For instance, the catalytic activity for CO oxidation of AFeO 3 (A = La, Nd, Sm)related perovskites follows the order Nd > La > Sm, according to Porta et al 10 and Ciambelli et al 11 Nevertheless, lanthanide elements remain as problematic as cobalt.…”

“…An alternative route to increase surface area during synthesis is by the generation of pores within the solid. This can be achieved through hard casting, using templates such as mesoporous silica or poly­(methyl methacrylate) nanospheres, or by nanostructuring of precursors, e.g., from macroporous Fe 2 O 3 …”

“…This can be achieved through hard casting, using templates such as mesoporous silica 8 or poly(methyl methacrylate) nanospheres, 3 or by nanostructuring of precursors, e.g., from macroporous Fe 2 O 3 . 9 …”

Three-dimensional ordered macroporous LaFe1−xMnxO3 with high stability for efficient NO oxidation and sulfur resistance

“…The smaller pore size was attributed to the fusion of metal oxides and contraction of the PMMA template at high temperature. 10 With the increase in temperature, a portion of nanoparticles will gradually agglomerate on the pore wall, and the size reduction ranged from 15% to 30%. The highly ordered macroporous structure is favorable for gas-solid reactions on the larger specific surface area, which provides greater complete contact between the reaction gas and active substance.…”

“…The smaller pore size was attributed to the fusion of metal oxides and contraction of the PMMA template at high temperature. 10…”