In this paper, a series of hexaaluminate oxides, LaMAl 11 O 19-δ (M=Fe, Co, Ni, Mn and Cu), were prepared using transition metals M to substitute Al in the hexaaluminate lattices. XRD analyses indicated that the seri...In this paper, a series of hexaaluminate oxides, LaMAl 11 O 19-δ (M=Fe, Co, Ni, Mn and Cu), were prepared using transition metals M to substitute Al in the hexaaluminate lattices. XRD analyses indicated that the series of hexaaluminates had almost the same magnetoplumbite crystal structure, however, they exhibted different reducibility and catalytic activities for CO 2 reforming of methane to synthesis gas. Among the LaMAl 11 O 19-δ samples, LaNiAl 11 O 19-δ showed the best catalytic activity for the reaction at 1 053 K for 2 h, the conversion of CH 4 and CO 2 was 98.8% and 97.6%, respectively, and the catalytic activities of rest Msubstituted catalysts were extremely lower than that of LaNiAl 11 O 19-δ . The sequence of affection on catalytic activity of transition metal M for the topic reaction was NiCo>Fe> Mn> Cu.展开更多
文摘In this paper, a series of hexaaluminate oxides, LaMAl 11 O 19-δ (M=Fe, Co, Ni, Mn and Cu), were prepared using transition metals M to substitute Al in the hexaaluminate lattices. XRD analyses indicated that the series of hexaaluminates had almost the same magnetoplumbite crystal structure, however, they exhibted different reducibility and catalytic activities for CO 2 reforming of methane to synthesis gas. Among the LaMAl 11 O 19-δ samples, LaNiAl 11 O 19-δ showed the best catalytic activity for the reaction at 1 053 K for 2 h, the conversion of CH 4 and CO 2 was 98.8% and 97.6%, respectively, and the catalytic activities of rest Msubstituted catalysts were extremely lower than that of LaNiAl 11 O 19-δ . The sequence of affection on catalytic activity of transition metal M for the topic reaction was NiCo>Fe> Mn> Cu.
