NOx-assisted soot combustion over dually substituted perovskite catalysts La1−xKxCo1−yPdyO3−δ

Fe,Pd Co‐Incorporated LaCoO3 Perovskites: Modification of Thermal Stability and Catalytic Activity for Gasoline Vehicle Exhaust Purification

“…Two main peaks at 623 and 813 K are observed for LaCoO 3 , which have been assigned to the reduction of Co 3+ to Co 2+ and Co 2+ to Co 0 respectively. [9,28,29] After the partial substitution of Co by Pd, the two peaks appear at significantly lower temperatures, especially the peak in the low-temperature region, which is due to the Pd substitution improving the reduction performance of the catalyst; the minor peak observed at 345 K is considered to result from the reduction of the palladium incorporated into the perovskite. [30][31][32] Further partial substitution of Co by Fe also leads to a decrease in the temperature of the reduction peak in the low-temperature region, although the effect is not as significant as the Pd doping.…”

“…[20] In addition, LaCo 0.95 Pd 0.05 O 3 , which has a palladium content of less than 30 % that of commercial catalysts, has also been intensively investigated due to its superior catalytic performance compared with LaCoO 3 . [9,21,22] However, the low structural stability of Co-based perovskites under a reducing atmosphere at high temperatures limits their application because decomposition of the catalysts is likely to influence the catalytic process resulting in unstable catalytic performance. [23,24] The partial substitution of Co by other ions such as Fe and Mn is considered to be a means to improving its stability as well as catalytic properties.…”

“…[6,7] For example, perovskite-type oxides with transition-metal cations such as Cu, Mg, Cr, Fe, Co, and Ce at the B sites have been investigated. [8][9][10][11][12][13][14] Of these catalysts, LaCoO 3 as a typical perovskite has attracted widespread attention and has been reported as an excellent catalyst for many reactions, for example, CH 4 oxidation, CO oxidation, and NO reduction. [15][16][17][18][19][20] Recently, a mesoporous perovskite synthesized by the hard template method was studied and highlighted for its high NO x reduction efficiency and high NO x to N 2 selectivity.…”

Synthesis of three-dimensionally ordered macroporous Al–Ce mixed oxide catalysts with high catalytic activity and stability for diesel soot combustion

“…This key challenge is to find effective catalysts for soot combustion that operates at low temperature [4]. Many kinds of catalysts, including transition metal oxide [5], precious metal [6][7][8], alkaline metal oxides [9], perovskite or perovskite-like oxides [10][11][12][13], and spinel-type oxides [14], rare earth metal oxides [15], hydrotalcite mixed oxides [16][17][18], have been investigated for soot combustion.…”

Characterization of the NO-soot combustion process over La0.8Ce0.2Mn0.7Bi0.3O3 catalyst

“…To promote the NO ! NO 2 conversion and lower the soot combustion temperature, development work has been undertaken on several catalysts, such as noble metals [1], transition metal oxides [2], alkaline metal oxides [3], perovskite oxides [4], and ceria-based oxides [5].…”