Role of Mineral Nutrients in Plant-Mediated Synthesis of Three-Dimensional Porous LaCoO₃

Abstract

With the assistance of Cacumen Platycladi extract the facile synthesis of 3D porous LaCoO3 perovskite is reported at a lower calcination temperature of 500 °C as compared with the traditional citric acid method. The formation mechanism is carefully studied by investigating the different roles of organic and inorganic components in several plant extracts. Two key factors to

Enhanced active site extraction from perovskite LaCoO3 using encapsulated PdO for efficient CO2 methanation

“…The biosynthesized LaCoO 3 (Fig. S1(A-C)) shows the porous structure of stacked LaCoO 3 NPs with a relatively high surface area of 26.7 m 2 g À1 (Table 1), which is similar to those in our previous report [22]. In contrast, both PdO/LaCoO 3 (Fig.…”

“…All of them only show characteristic diffraction peaks at 23.2°, 33.2°, 40.7°and 47.5°, which are assigned to a typical perovskite LaCoO 3 (JCPDS No. 48-0123), confirming the advantages of biosynthesis in producing perovskite-type structures at low calcination temperature [22]. XPS characterization was carried out to determine the state of Pd, since it was undetectable by XRD.…”

“…It can be seen from Fig. 4(A), the H 2 -TPR profile of parent LaCoO 3 shows two typically H 2 consumption regions: the low-temperature peak at 250-450°C and the high one at 450-750°C [18,22]. The H 2 consumption peaks at low temperature are linked to the reduction of surface chemisorption oxygen and Co 3+ to Co 2+ with perovskite electroneutrality and structure maintained [12].…”

“…Another inspirational example is that Fe 2 O 3 nanocores derived from the A-site deficient catalyst (La (1Ày) Co 0.4 Fe 0.6 O 3Àd ) were dispersed in the La-Co-Fe perovskite matrix, and benefitted the extraction of Co 0 [21]. On the other hand, our recent work shows that plant extracts are environmentally friendly and economic material for the green fabrication of PTOs due to their excellent ability of chelating and stabilizing [22]. Meanwhile, plant extracts are also an excellent reducing agent, which have been widely applied to the facile production of metal NPs [23].…”

Insight into the Effect of Copper Substitution on the Catalytic Performance of LaCoO3-Based Catalysts for Direct Epoxidation of Propylene with Molecular Oxygen

“…Perovskite-type oxides applied in solar cells, catalytic materials, and optical sources are an emerging class of semiconducting materials exhibiting outstanding optoelectronic properties. − Toniolo et al identified that Cu modified LaCoO 3 perovskites show desirable performance in the partial oxidation of methane to syngas. La 1– x Sr x FeO 3−δ which is effective for selective oxidation of ethane to ethylene or syngas demonstrates its immense potential in heterogeneous catalysis or even selective oxidation catalysis .…”