Effect of Li2O and CoO-doping of CuO/Fe2O3 system on its surface and catalytic properties

Nanosized copper ferrite materials: Mechanochemical synthesis and characterization

“…7). According to [33], the increasing amount of the octahedrally coordinated copper ions in the spinel structure, which is observed after the catalytic test, could also facilitate the catalytic process, due to the fact that the catalytic properties of the spinel materials are mainly determined by the more exposed to the surface octahedrally coordinated cations. So, the increase in the reduction ability and the catalytic activity in toluene oxidation is considered as a result of higher degree of crystallization of a mixture of hematite, CuO and ferrite phase.…”

Nanosized spinel oxide catalysts for CO-oxidation prepared via CoMnMgAl quaternary hydrotalcite route

“…Several synthetic methods have been used to synthesize hydrotalcites and spinel powder that include the precipitation [24][25][26], hydrothermal [27], salt oxide method [28], urea reduction [29,30], electrochemical [31,32], mechanical activation with subsequent annealing [33], and sol-gel [34]. Co-precipitation is a simple and effective method for the preparation of multi-component oxides [35]. The most frequently used methods are co-precipitation and urea reduction, while the sol-gel and electrochemical are the least used methods.…”

Preparation of Modified Red Mud-Supported Fe Catalysts for Hydrogen Production by Catalytic Methane Decomposition

“…The isotherms of 600 ∘ C calcined catalyst precursors (MRM-600 and 20Fe/MRM-600) and catalysts (MRM and 20Fe/MRM) were categorized as classical type IV. The hysteresis loops belonged to the H 2 type with steep adsorption and desorption branches, suggesting that the catalysts possessed a typical mesoporous structure [47]. From the pore size distribution curves in Figure 4(a), we determined that the pore sizes of the 20Fe/MRM catalysts were distributed from 5 to 12 nm.…”

“…The uncalcined 20Fe/MRM catalyst precursor exhibited a greater total weight loss than RM, which indicated a greater hydroxide content in the uncalcined 20Fe/MRM catalyst precursor than in RM due to the added Fe contents that directly increased the iron hydroxide formed during the precipitation process. The purpose of the calcining process in catalyst pretreatment is to transform the hydroxides into metal oxides and improve the pore structure as much as possible; however, high temperature can cause sintering of the pore structure and lead to decreased surface areas [47]. Therefore, based on the above analysis, the calcining temperature chosen in this study was 600 ∘ C.…”