Synthesis, Characterization, and Catalytic Activity of Mn‐doped Perovskite Oxides for Three‐Way Catalysis

Abstract

Mn-doped La 0.8 Sr 0.2 CoO 3 perovskite oxides (La 0.8 Sr 0.2 Co 1-x Mn x O 3 ; x = 0, 0.1, 0.3, 0.5) were synthesized by a modified sol-gel method. The phase-pure oxides were obtained. CoO and carbonates were formed on the surface of La 0.8 Sr 0.2 CoO 3 . With increasing doping content, these impurities were reduced while the stability of the perovskite structure was improved. The valence state of B-site ions and the amount of absorbed oxygen were influenced by Mn doping. The catalytic activity of the perovskite catalysts was investigated for CO oxidation and simultaneous removal of CO, C 3 H 8 , and NO. For CO and NO removal, La 0.8 Sr 0.2 Co 0.9 Mn 0.1 O 3 exhibited the best performance. For C 3 H 8 removal, the reactivity was promoted linearly with the doping content. The structure-activity relationship is also discussed.

Effect of Thermal Aging on Local Structure and Three-Way Catalysis of Cu/Al2O3

“…There are numerous reports on Cu-containing catalysts for TWC reactions, some of which focus on controlling local Cu structures using composite oxides. − Glisenti et al synthesized Cu-doped perovskite oxides, LaCo 1– x Cu x O 3 , to determine their catalytic activities for the stoichiometric CO–NO and TWC reactions . The activity for NO reduction under fuel-rich (O 2 deficient) TWC conditions was improved by Cu-doping into the perovskite structure but deteriorated in the presence of stoichiometric amount of O 2 .…”

Hollow Ag/carbon microporous spheres with high catalytic activity based on a bio-inspiration polydopamine reaction platform

“…The CO oxidation was evaluated on a Finesorb 3010 instrument with a xed-bed U-shaped quartz reactor with 3 mm internal diameter. 30 20 mg of Ag/carbon catalysts were used for each test, and the reaction temperature with a heating rate of 2 C min À1 was controlled by using a K-type thermocouple which directly contacted with the upper quartz wool near the Ag/carbon powder (Fig. S1 †).…”

Removing NOx, CO and HC from automobile exhaust based on chemical looping combustion

“…found that a La 0.8 Sr 0.2 Co 0.9 Mn 0.1 O 3 catalyst synthesized with a modified sol–gel method showed excellent CO removal performance. However, the conversions of C 3 H 8 and NO were both <50% at 500 °C under stoichiometric conditions . Garbujo et al .…”