Synthesis of ethane and ethylene from methane and carbon dioxide over praseodymium oxide catalysts

被引:76
作者
Asami, K [1 ]
Kusakabe, K [1 ]
Ashi, N [1 ]
Ohtsuka, Y [1 ]
机构
[1] TOHOKU UNIV,INST CHEM REACT SCI,RES CTR CARBONACEOUS RESOURCES,SENDAI,MIYAGI 98077,JAPAN
关键词
methane; C-2; hydrocarbons; carbon dioxide; praseodymium oxide;
D O I
10.1016/S0926-860X(96)00408-5
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Catalytic effectiveness for the synthesis of ethane and ethylene from methane and carbon dioxide has been examined mainly at 1123 K over 14 lanthanide oxides. Praseodymium (Pr) and terbium oxides show high yield and high selectivity of C-2 hydrocarbons among lanthanide oxides. The catalytic performances of Pr oxides are influenced by the preparation method; a commercial Pr oxide prepared from the oxalate shows the highest C-2 selectivity of about 50%, and the stable performance for 20 h. Higher partial pressures of CO2 and CH4 are favorable for C-2 formation over the oxide catalyst. Reaction mechanisms over Pr oxides are discussed in terms of a redox mechanism involving the unstable lattice oxygen.
引用
收藏
页码:43 / 56
页数:14
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