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Fabrication of molybdenum carbide catalysts over multi-walled carbon nanotubes by carbothermal hydrogen reduction

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Abstract

Molybdenum carbide catalysts were successfully prepared using original multi-walled carbon nanotubes (MWCNTs) and nitric acid treated ones as support and carbon source by carbothermal hydrogen reduction from 580 °C to 700 °C. Ammonium heptamolybdate was used as Mo precursor and the effects of oxygen functional groups on MWCNT surface were investigated. TEM and XRD results show that oxygen functional groups act as anchor sites to interact with the Mo oxyanion species during impregnation, which promote the dispersion of Mo precursors. Due to the relatively strong interaction between Mo precursors and MWCNTs, the agglomeration of Mo carbide particles is prevented even when the treatment temperature is as high as 700 °C. Moreover, as the support, modified MWCNTs exhibit better thermal resistances. The temperature (580 °C) for Mo2C formation over MWCNTs is much lower than that over conventional carbon supports using carbothermal hydrogen reduction. The methylcyclohexane dehydrogenation was used as a probe reaction to test the catalytic performances of the Mo2C catalysts obtained.

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Acknowledgements

We are grateful for the financial support of the National Natural Science Foundation of China (Grant No. 90206036) and the Ministry of Science and Technology of China through the National Key project of Fundamental Research (Grant No. 2005CB221405). We also thank referees for the helpful suggestions.

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Authors and Affiliations

  1. State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, P.O. Box 110, Dalian, 116023, P.R. China

    Xiaoyun Li, Ding Ma, Limin Chen & Xinhe Bao

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  1. Xiaoyun Li
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  2. Ding Ma
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  3. Limin Chen
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  4. Xinhe Bao
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Correspondence to Xinhe Bao.

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Li, X., Ma, D., Chen, L. et al. Fabrication of molybdenum carbide catalysts over multi-walled carbon nanotubes by carbothermal hydrogen reduction. Catal Lett 116, 63–69 (2007). https://doi.org/10.1007/s10562-007-9093-x

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  • DOI: https://doi.org/10.1007/s10562-007-9093-x

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