物理化学学报 >> 2006, Vol. 22 >> Issue (08): 1040-1042.doi: 10.3866/PKU.WHXB20060826

研究简报 上一篇    

低温甲烷氧化偶联Li- ZnO/La2O3催化剂

侯思聪;刘凌涛;寇元   

  1. 北京大学化学与分子工程学院, 北京大学绿色化学研究中心, 北京分子科学国家实验室,
  • 收稿日期:2006-06-01 修回日期:2006-06-22 发布日期:2006-08-04
  • 通讯作者: 寇元 E-mail:yuankou@pku.edu.cn

Li-ZnO/La2O3 Catalyst for the Oxidation Coupling of Methane at Low Temperature

HOU Si-Cong;LIU Ling-Tao;KOU Yuan   

  1. State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Beijing National Laboratory for Molecular Sciences, Green Chemistry Center of Peking University, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China
  • Received:2006-06-01 Revised:2006-06-22 Published:2006-08-04
  • Contact: KOU Yuan E-mail:yuankou@pku.edu.cn

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摘要： 采用浸渍法制备了Li- ZnO/La2O3催化剂并考察了其低温催化甲烷氧化偶联反应性能. 反应条件下, 在考察的w(Li)=2%和w(ZnO)=20%的Li- ZnO/La2O3在680 ℃得到了甲烷转化率为27.3%, C2选择性为65.2%, C2收率为17.8%的结果；在700 ℃, C2收率达到21.8%. Raman和XPS表征结果表明, 催化剂低温催化性能与表面的活性吸附氧物种含量相关；La2O2CO3物种可能是提高催化剂的C2选择性的关键.

关键词: 甲烷氧化偶联, 低温, Li-ZnO/La2O3, 吸附氧种, La2O2CO3

Abstract: The oxidative coupling of methane (OCM) at low temperature was examined on Li- ZnO/La2O3 catalyst with w(Li)=2% and w(ZnO)=20%. CH4 conversion of 27.3% with C2 selectivity of 65.2% was obtained at 680 ℃ and the C2 yield reached 21.8% at 700 ℃ under reaction conditions. Raman and XPS results suggested that the low- temperature activity was related to the concentration of adsorbed oxygen species on the catalyst surface and La2O2CO3 was supposed to be responsible for the enhancement of C2 selectivity in OCM.

Key words: Oxidative coupling of methane, Low temperature, Li- ZnO/La2O3, Adsorbed oxygen species, La2O2CO3