Effect of Preparation Method on Catalytic Properties of Double Perovskite Oxides LaSrFeMo<sub>0.9</sub>Co<sub>0.1</sub>O<sub>6</sub> for Methane Combustion

Abstract

The double perovskite oxides LaSrFeMo0.9Co0.1O6 was prepared by co-precipitation method and sol-gel method. The title catalysts were calcined at 800˚C and characterized by XRD H2-TPR, SEM and TG-DTA techniques. The catalytic activity was evaluated for methane combustion. The specific surface area of them was calculated by BET model. The samples exhibit significant catalytic activity for methane combustion at 800˚C. Upon calcination at 800˚C, the LaSrFeMo0.9Co0.1O6 prepared by sol-gel method retains a specific surface area of 24 m 2 •g −1 and shows an excellent activity for methane combustion (the conversion of 10% and 90% are obtained at 505˚C and 660˚C, respectively).

Selection of cobaltite and effect of preparation method of NiCo2O4 for catalytic oxidation of CO–CH4 mixture

“…Several types of catalysts have been studied for separate oxidation of CO and CH 4 , such as noble metals (Pd and Pt), perovskite, spinel, hydrotalcite, and mixed metal oxides . Noble metal catalysts are presently used in the three‐way catalytic converter for emission control from the vehicles .…”

Boosting Catalytic Purification of Soot Particles over Double Perovskite-Type La2–xKxNiCoO6 Catalysts with an Ordered Macroporous Structure

“…17,18 The change in radius induced by the binary B-site ions and the ordered arrangement of [ B′O 6 ] and [BO 6 ] octahedron can cause a slight distortion of the structure and induce the formation of coordinatively unsaturated cations, which is helpful to the activation and dissociation of O 2 . 19,20 The reversibly released O 2 at the coordinatively unsaturated cations plays an important role in catalyzing soot oxidation. 21−23 Compared with the single B site, the synergy between B and B′ sites in A 2 BB′O 6 is more constructive to improve the catalytic performance of deep oxidation.…”

“…Also, the A-site cations with larger sizes (such as alkaline or rare earth elements) fill in the gaps of multiple [BO 6 ] octahedrons for the structural stabilization. The double perovskite-type A 2 BB′O 6 structure is the result of partial substitution of the B site in single perovskite-type ABO 3 with other elements, and binary B-site ions are linked by intermediate bridge O (B–O–B′) and ordered arrangement alternately, which results in the superexchange effect for boosting catalytic oxidation. , The change in radius induced by the binary B-site ions and the ordered arrangement of [B′O 6 ] and [BO 6 ] octahedron can cause a slight distortion of the structure and induce the formation of coordinatively unsaturated cations, which is helpful to the activation and dissociation of O 2 . , The reversibly released O 2 at the coordinatively unsaturated cations plays an important role in catalyzing soot oxidation. − Compared with the single B site, the synergy between B and B′ sites in A 2 BB′O 6 is more constructive to improve the catalytic performance of deep oxidation . In our previous works, the catalysts of perovskite-type LaMO 3 (M: Mn, Co, Ni, Fe, and Cr) oxides presented high activity for catalyzing soot removal, and the LaNiO 3 and LaCoO 3 catalysts presented the relatively high performances among the catalysts .…”

The Effect of Replacement of Zn <sup>2+</sup> Cation with Ni <sup>2+</sup> Cation on the Structural Properties of Ba sub>2</sub>Zn sub>1–x </sub>Ni sub>x</sub>WO sub>6</sub> Double Perovskite Oxides (X = 0, 0.25, 0.50, 0.75, 1)

“…The first phase transition from monoclinic (P21/n) crystal structure to tetragonal (I4/m) crystal structure occurred at 80˚C, while the second transition to cubic (Fm-3m) occurred at 480˚C. The effect of the preparation methods on the catalytic activity of the LaSrFeMo 0.9 Co 0.1 O 6 methane combustion double perovskite oxide was studied by Zheng et al [7] using two methods; co-precipitation and sol-gel. The sol-gel method had greater impacts on the catalytic activity than co-precipita-tion method.…”