Catalytic combustion of methane over mixed oxides derived from Co-Mg/Al ternary hydrotalcites

Journal article

CoxMg3 - x /Al composite oxides (xCoMAO-800) were prepared by calcination of CoxMg3 - x/Al hydrotalcites (x = 0.0, 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, respectively) at 800 °C. The materials were characterized using XRD, TG-DSC, N2 adsorption-desorption and TPR. The methane catalytic combustion over the xCoMAO-800 was assessed in a fixed bed micro-reactor. The results revealed that cobalt can be homogenously dispersed into the matrices of the hydrotalcites and determines the structure, specific surface areas and porosity of the derived xCoMAO-800 oxide catalysts. The thermal stability and homogeneity of the hydrotalcites markedly depends on the cobalt concentration in the hydrotalcites. The Co-based hydrotalcite-derived oxides exhibit good activity in the catalytic combustion of methane. The catalytic activity over the xCoMAO-800 oxides enhances with increasing x up to 1.5, but subsequently decreases dramatically as cobalt loadings are further increased. The 1.5CoMAO-800 catalyst shows the best methane combustion activity, igniting methane at 450 °C and completing methane combustion around 600 °C. The catalytic combustion activity over the xCoMAO-800 oxides are closely related to the strong Co-Mg/Al interaction within the mixed oxides according to the TG-DSC, TPR and activity characteristics. © 2009 Elsevier B.V.

Authors: Jiang, Z; Yu, J; Cheng, J; Mao, T; Jones, M

• Publication status: Published
• Journal: FUEL PROCESSING TECHNOLOGY
• Volume: 91
• Issue: 1
• Pages: 97-102
• Publication date: 2010-01-01
• DOI: 10.1016/j.fuproc.2009.08.023
• ISSN: 0378-3820
• Language: English
• Keywords: Hydrotalcite; Methane; Catalytic combustion; Cobalt; Mixed oxide