高等学校化学学报

高等学校化学学报 ›› 2010, Vol. 31 ›› Issue (1): 130.

• 研究论文 • 上一篇    下一篇

碳化终温对碳化钼的制备及甲烷二氧化碳重整催化性能的影响

程金民, 黄伟, 左志军   

  1. 太原理工大学煤化工研究所, 煤科学与技术教育部和山西省重点实验室, 太原 030024
  • 收稿日期:2009-05-14 出版日期:2010-01-10 发布日期:2010-01-10
  • 通讯作者: 黄伟, 男, 博士, 教授, 主要从C1化学与化工研究. E-mail: huangwei@tyut.edu.cn
  • 基金资助:

    国家“九七三”计划项目(批准号: 2005CB221204)和国家自然科学基金(批准号: 20676085)资助.

Effect of Carburization Temperature on the Preparation and the Catalytic Performance of Molybdenum Carbide in the Dry-methane Reforming(DMR)

CHENG Jin-Min, HUANG Wei*, ZUO Zhi-Jun   

  1. Key Laboratory of Coal Science and Technology, Ministry of Education and Shanxi Province, Institute of Coal Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, China
  • Received:2009-05-14 Online:2010-01-10 Published:2010-01-10
  • Contact: HUANG Wei. E-mail: huangwei@tyut.edu.cn
  • Supported by:

    国家“九七三”计划项目(批准号: 2005CB221204)和国家自然科学基金(批准号: 20676085)资助.

PDF (PC)

被引次数

13

摘要：

以MoO3为前驱物, 于20%CH4-80%H2的混合气体(100 mL/min)中, 在不同设定终温下进行碳化, 制备了一系列不同碳化终温的Mo2C, 通过XRD和XPS等手段进行了表征, 并对其甲烷二氧化碳重整(DMR)制备合成气的催化性能进行评价, 讨论了碳化终温作为Mo2C的制备参数, 与所制备的Mo2C体相、表面特征和催化剂性能的关系. 结果表明, 碳化终温在700 ℃以上制得的Mo2C催化剂晶相为较纯的β-Mo2C, 随着碳化终温的升高, 催化剂碳化程度不断提高, 表面的自由碳不断增多, 碳化终温为800 ℃时为最佳, 所制备的Mo2C催化剂碳化程度较高, 表现出最佳的催化性能, 同时催化剂表面自由碳较为适量, 促进了Mo2C催化剂的碳化和氧化平衡, 有利于催化剂的活性和稳定性.

关键词: 碳化钼; 甲烷二氧化碳重整; 碳化终温

Abstract:

A series of molybdenum carbide catalysts were prepared using 20%CH4-H2 to carburize molybdenum trioxide at different temperatures. The catalysts were characterized using X-ray diffraction(XRD), X-ray photoelectron spectroscopy(XPS) and N2-adsorption. Their catalytic performance was evaluated in the model reaction of the dry-methane reforming(DMR) to synthesis gas. Here, the characteration of bulk and surface Mo2C catalysts and its influence on the catalytic performance were described. The results show that the more pure crystalline phase of β-Mo2C is obtained when the Mo2C catalyst is prepared at carbonization temperature above 700 ℃. The carburization degree was improved and free carbon on the surface was increased with increase of carbonization temperature. The catalyst prepared at carbonization temperature of 800 ℃ shows the best catalytic performance. The result indicated that high carburization degree and the appropriate amount of free carbon on the surface could promote carbonation and oxidation balance of Mo2C catalyst and favor the catalyst activity and stability.

Key words: Molybdenum carbide; Dry-methane reforming(DMR); Carburization temperature

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