MgO support mediated enhancement of La2BMnO6 (B = Co, Ni) perovskite oxide in catalytic combustion of propane

Abstract

Perovskite oxides possessing high stability and composition adjustability are effective in many applications. The La₂BMnO₆ (B=Co, Ni) double perovskite oxides were synthesized using the sol-gel method and deposited on MgO support (loading = 10, 20, and 30 wt. %) using a mechanical mixing method by an ultrasonic device. The elaborated samples were investigated for application in propane deep oxidation. The catalytic performance of these catalysts was analyzed by a variety of characterization techniques such as XRD, SEM, FTIR, TEM, and H₂-TPR. Ni-containing catalysts were found to have superior catalytic activity than the sample containing Co. The lowest catalytic activity belonged to the cobalt-containing double perovskite with 10 wt.% loading on MgO support, while the highest conversion was related to the 20La₂NiMnO₆/MgO composite oxide with T₉₀ = 434 °C. The support showed a positive impact on the performance of the catalysts. Deposition of a certain amount of perovskite oxides on the support boosted the specific surface area of the catalyst and, therefore, combined with improved reducibility, improved propane catalytic degradation. Highlights

• The deposition of La₂BMnO₆ (B = Co, Ni) double perovskite oxides on MgO support has been successfully accomplished by a facile method.
• Deposition of the perovskite on the MgO support led to higher specific surface area, and higher reducibility of the supported catalyst.
• Certain loading of the perovskite oxide on MgO support is conducive to a superior catalytic combustion activity as compared with unsupported one.