Hexaaluminate oxides LaMAl11O19-delta catalyzing CO2 reforming of methane to synthesis gas

In this paper, a series of hexaaluminate oxides, LaMAl11O19-delta(M=Fe, Co, Ni, Mn and Cu), were prepared using transition metals Ni to substitute Al in the hexaaluminate lattices. XRD analyses indicated that the series of he xaaluminates had almost the same magnetoplumbite crystal structure, however , they exhibited different reducibility and catalytic activities for CO2 re forming of methane to synthesis gas. Among the LaMAl11O19-delta samples, La NiAl11O19-delta showed the best catalytic activity for the reaction at 1 05 3 K for 2 h, the conversion of CH4 and CO2 was 98.8% and 97.6%, respectivel y, and the catalytic activities of rest M-substituted catalysts were extrem ely lower than that of LaNiAl11O19-delta. The sequence of affection on cata lytic activity of transition metal M for the topic reaction was Ni>>Co>Fe> Mn>Cu.