β-氧化铝型复合氧化物BaMAl_(11)O_(19-δ)催化CO_2重整甲烷制合成气

CO_2 Reforming of Methane to Syngas Catalyzed by β-Alumina Oxides

通过过渡金属M（M＝Fe、Co、Ni、Mn和Csu）的同晶取代作用,制备了一系列β-氧化铝型复合金属氧化物BaMAl11O19-δ催化剂,用XRD、XPS和TPR等对催化剂的结构和性质进行了表征.结果表明,这类物质的还原性和催化活性与其结构和晶格中过渡金属活性组分的性质密切相关其中,Ni取代复合氧化物BaNiAl11O19-δ。表现出更高的催化活性和稳定性,在780℃反应2h,CH4和CO2转化率分别达96.6％和94.8％,其它过渡金属取代复合氧化物活性均低于BaNiAl11O19-δ,过渡金属活性顺序为Ni＞＞Co＞Fe＞Mn＞Cu.

A series of transition metal substituted β-alumina oxides, BaMAl11, O19-δ(M = Fe, Co,Ni, Mn, Cu) were prepared. The structures and characteristics of the catalysts were investigated by XRD, XPS and TPR techniques. The catalysts were identified to have almost the same β-alumina crystal structure, but exhibited different reducibility and catalytic activities for CO2 reforming of methane to syngas in close relation to the crystal structure and characteristics of the transition metal in β-alumina oxides lattices. Among the β-alumina oxides, BaNiAl11O19-δ showed significant catalytic activity and stability without sintering and deactivation. When reforming was carried out at 780℃ for 2 h the conversion of CH4 and CO2 reached 96. 6 % and 94. 8 %,respectively. The catalytic activities of other catalysts were much lower than that of BaNiAl11O19-δ.The activity order of the catalysts in view of transition metals was Ni>>Co > Fe > Mn > Cu.