催化学报

催化学报 ›› 2010, Vol. 31 ›› Issue (1): 21-23.

• 研究快讯 • 上一篇    下一篇

CO2 在高分散 Ni/La2O3 催化剂上的甲烷化

宋焕玲, 杨建, 赵军, 丑凌军   

  1. 中国科学院兰州化学物理研究所羰基合成与选择氧化国家重点实验室, 甘肃兰州 730000
  • 收稿日期:2010-01-25 出版日期:2010-01-25 发布日期:2010-01-25

Methanation of Carbon Dioxide over a Highly Dispersed Ni/La2O3 Catalyst

SONG Huanling, YANG Jian, ZHAO Jun, CHOU Lingjun*   

  1. State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, Gansu, China
  • Received:2010-01-25 Online:2010-01-25 Published:2010-01-25

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摘要： 以 La2O3 为载体, 采用浸渍法制备了 10%Ni/La2O3 催化剂, 考察了该催化剂的 CO2 甲烷化反应性能. 结果表明, 在较低的温度 (350 oC) 和高空速 (约 30000 h–1) 下, 甲烷时空收率可大于 3000 g/(kg•h), 无论转化率高低, 甲烷选择性始终保持在 100%. X 射线衍射和 H2-程序升温还原等表征结果表明, CO2 在 Ni/La2O3 催化剂上的加氢机理可能与 Ni/γ-Al2O3 上不同, 并且 La2O2CO3 的形成有利于提高催化剂活性.

关键词: 二氧化碳, 甲烷化, 镍, 氧化镧, 负载型催化剂, 氧化碳酸镧

Abstract:  The methanation of carbon dioxide on a Ni/La2O3 catalyst containing 10 wt% Ni prepared by the impregnation method was studied. The space-time yield of methane was 3000 g/(kg·h) at conditions of 350 oC, GHSV of 30000 h–1, 1.5 MPa pressure, and H2/CO2 molar ratio of 4/1. The selectivity for methane was 100% with different CO2 conversions. Combined with X-ray diffraction and H2 temperature-programmed reduction analyses, this suggested that the reaction mechanism on Ni/La2O3 may be different from that on Ni/γ-Al2O3. The formation of lanthanum oxycarbonate (La2O2CO3) can play an important role in the activation of CO2.

Key words: carbon dioxide, methanation, nickel, lanthana, supported catalyst, lanthanum oxycarbonate