催化学报

催化学报 ›› 2008, Vol. 29 ›› Issue (9): 884-888.

• 研究论文 • 上一篇    下一篇

不同炭载体上碳化钼催化剂的合成

李晓芸,马丁,包信和   

  1. 中国科学院大连化学物理研究所催化基础国家重点实验室, 辽宁大连 116023
  • 收稿日期:2008-09-25 出版日期:2008-09-25 发布日期:2012-07-19

Synthesis of Molybdenum Carbide Catalysts over Different Carbon Supports

LI Xiaoyun, MA Ding, BAO Xinhe*   

  1. State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, The Chinese Academy of Sciences, Dalian 116023, Liaoning, China
  • Received:2008-09-25 Online:2008-09-25 Published:2012-07-19

PDF

1240

被引次数

13

摘要： 在三种不同炭材料上用程序升温还原法成功制备了负载型Mo2C催化剂,并用X射线衍射和程序升温还原-质谱检测了合成过程中Mo2C的形成历程. 结果显示,炭材料的性质及合成条件均对Mo2C的形成温度及合成过程有着显著的影响. 以纯氢为反应气体时,石墨化程度较高的炭黑载体上钼物种可被还原为金属Mo, 再与碳物种直接碳化生成Mo2C; 在碳纳米管载体上Mo2C的生成温度较炭黑上低; 在活性炭载体上钼物种只被还原到较低的氧化态,之后与碳反应生成Mo2C. 当氢气不足或在惰性气氛下,炭载体在高于700 ℃时还原钼物种并使之发生碳化生成Mo2C.

关键词: 碳化钼, 碳纳米管, 炭黑, 活性炭, 负载型催化剂, 程序升温还原, 氢, 碳热还原法

Abstract: The transformations of Mo species went through different ways during preparation of Mo2C catalysts over different carbon materials, in which metallic molybden um was observed over the graphitic carbon material. The temperature for molybden um carbide formation over carbon nanotubes is the lowest among three carbon mate rials.

Key words: molybdenum carbide, carbon nanotube, carbon black, activated carbon, supported catalyst, temperature-programmed reduction, hydrogen, carbothermal reduction method