关键词: 六铝酸盐LaMAl₁₁O_19-&delta, 催化剂, 甲烷, 二氧化碳重整, 合成气

Abstract: In this paper, a series of hexaaluminate oxides, LaMAl₁₁O_19-δ(M=Fe, Co, Ni, Mn and Cu), were prepared using transition metals Mto substitute Al in the hexaaluminate lattices. XRDanalyses indicated that the series of hexaaluminates had almost the same magnetoplumbite crystal structure, however, they exhibted different reducibility and catalytic activities for CO₂reforming of methane to synthesis gas. Among the LaMAl₁₁O_19-δ samples, LaNiAl₁₁O_19-δ showed the best catalytic activity for the reaction at 1053 Kfor 2 h, the conversion of CH₄and CO₂was 98.8% and 97.6%, respectively, and the catalytic activities of rest Msubstituted catalysts were extremely lower than that of LaNiAl₁₁O_19-δ . The sequence of affection on catalytic activity of transition metal Mfor the topic reaction was Ni>>Co>Fe> Mn> Cu.

Key words: Hexaaluminate LaMAl₁₁O_19-δcatalysts, Methane, CO₂-reforming, Synthesis gas