Issue 29, 2016

One-step synthesis of bulk Mo and Ni–Mo carbides for methanation

Abstract

β-Mo2C and Ni/β-Mo2C catalysts were prepared by a single-step thermal decomposition method using hexamethylenetetramine (HMT) as a reducing agent and carbon source. The synthesized carbides were detailedly characterized and their catalytic performances in methanation were evaluated. The results showed that serious carbon deposition was observed in β-Mo2C, while for Ni/β-Mo2C, the carbon content was insufficient and Ni3Mo3N was produced. With respect to catalytic performances in methanation, the β-Mo2C catalyst exhibited a high CO conversion, but its CH4 selectivity was low and its activity was not stable due to hydrogenation of the carbidic carbon. While the Ni/β-Mo2C catalyst exhibited excellent activity and stability, the CO conversion and CH4 selectivity increased from 67.41% and 33.54% on β-Mo2C to 92.51% and 52.73% on Ni/β-Mo2C. This is ascribed to Ni3Mo3N in Ni/β-Mo2C, which is more active and stable during methanation.

Graphical abstract: One-step synthesis of bulk Mo and Ni–Mo carbides for methanation

Article information

Article type
Paper
Submitted
12 Nov 2015
Accepted
26 Feb 2016
First published
26 Feb 2016

RSC Adv., 2016,6, 24353-24360

One-step synthesis of bulk Mo and Ni–Mo carbides for methanation

X. Huo, Z. Wang, J. Huang, R. Zhang and Y. Fang, RSC Adv., 2016, 6, 24353 DOI: 10.1039/C5RA23870F

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