催化学报

催化学报 ›› 2007, Vol. 28 ›› Issue (5): 429-434.

• 研究论文 • 上一篇    下一篇

采用等离子体强化制备CO2甲烷化用镍基催化剂

郭芳1,储伟1,徐慧远1,张涛2   

  1. 1 四川大学化学工程学院, 四川成都 610065; 2 中国科学院大连化学物理研究所, 辽宁大连 116023
  • 收稿日期:2007-05-25 出版日期:2007-05-25 发布日期:2011-04-28

Glow Discharge Plasma-Enhanced Preparation of Nickel-Based Catalyst for CO2 Methanation

GUO Fang1, CHU Wei1*, XU Huiyuan1, ZHANG Tao2   

  1. 1 College of Chemical Engineering, Sichuan University, Chengdu 610065, Sichuan, China; 2 Dalian Institute of Chemical Physics, The Chinese Academy of Sciences, Dalian 116023, Liaoning, China
  • Received:2007-05-25 Online:2007-05-25 Published:2011-04-28

PDF

1037

被引次数

46

摘要： 采用等离子体技术强化制备了γ-Al2O3担载的镍基催化剂,以CO2甲烷化为模型反应考察了等离子体引入方式对催化剂性能的影响,并采用程序升温还原和脱附、氧滴定、N2吸附、X射线衍射、X射线光电子能谱和热重分析对催化剂进行了表征. 反应结果表明,经等离子体处理再还原活化的催化剂具有较高的低温催化活性,在101.325 kPa,13500h-1, H2/CO=2.5和250 ℃的条件下, CO2转化率为84.6%, 比常规催化剂提高了27.2%. 表征结果表明,等离子体处理有利于前驱体在温和条件下分解形成活性相,促使催化剂的活性组分晶粒细化并在表面富集,有效提高了活性组分的分散度,从而提高了催化剂的催化活性.

关键词: 等离子体, 镍, 氧化镧, 氧化铝, 二氧化碳, 甲烷化

Abstract: The novel Ni-based catalyst for CO2 methanation, Ni-La/γ-Al2O3, was prepared by the plasma method and the effect of the plasma introduction mode on the catalytic performance was investigated. The catalyst treated with plasma followed by reduction exhibited high activity at low temperature. The CO2 conversion over this catalyst was 84.6% under the conditions of 101.325 kPa,13500h-1, H2/CO2 molar ratio of 2.5, and 250 ℃, whereas that over the conventional catalyst was 57.4%. The catalyst was characterized using temperature-programmed reduction and desorption, oxygen titration, N2 adsorption,X-raydiffraction,X-rayphotoelectron spectroscopy, and thermogravimetry analysis. The results indicated that the plasma treatment enlarged the surface area of the sample, favored the formation of small size crystals, and facilitated the high dispersion and enrichment of the Ni element on the catalyst surface.

Key words: plasma, nickel, lanthana, alumina, carbon dioxide, methanation