Preparation and characterization of LaFe1−xMgxO3/Al2O3/FeCrAl: Catalytic properties in methane combustion

• Published in: Applied catalysis. B, Environmental Environmental, 2006-07, Vol.66 (3-4), p.265-273
• Main Authors: Yin, Fengxiang, Ji, Shengfu, Chen, Biaohua, Zhao, Liping, Liu, Hui, Li, Chengyue
• Format: Article
• Language: English
• Subjects: Catalysis; Chemistry; Exact sciences and technology; General and physical chemistry; LaFe1−xMgxO3; Methane catalytic combustion; Monolithic catalysts; SEM; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; TPR; Washcoat; XRD
• ISSN: 0926-3373; 1873-3883
• DOI: 10.1016/j.apcatb.2006.03.017

A series of the LaFe1−xMgxO3/Al2O3/FeCrAl catalysts (x=0–1) were prepared. The structure of the catalysts was characterized using X-ray powder diffraction (XRD), scanning electron microscope (SEM) and temperature-programmed reduction (TPR). The catalytic activity of the catalysts for the methane combustion was evaluated. The catalytic stability of the catalysts for 100h was tested with a fixed bed reactor. The results indicated that in the LaFe1−xMgxO3/Al2O3/FeCrAl catalysts the phase structure were the LaFe1−xMgxO3 perovskite-type oxides, α-Al2O3 and γ-Al2O3. The surface particle shape and size were more different with the variety of the molar ratio of Fe to Mg in the LaFe1−xMgxO3. The Fe component of the LaFe1−xMgxO3/Al2O3/FeCrAl catalysts played an important role to the catalytic activity for the methane combustion and the order of the catalytic activity in terms of x was 0.5>0.3>0.7>0.9>0>0.1>1. In the LaFe1−xMgxO3/Al2O3/FeCrAl catalysts (x=0.1–0.9) the Fe and Mg components can promote the thermal stability. There were the stronger interaction among the LaFe1−xMgxO3 perovskite-type oxides and the Al2O3 washcoats and the FeCrAl support.