Simple and large-scale synthesis of β-phase molybdenum carbides as highly stable catalysts for dry reforming of methane,Inorganic Chemistry Frontiers

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Simple and large-scale synthesis of β-phase molybdenum carbides as highly stable catalysts for dry reforming of methane
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2017-10-25 00:00:00 , DOI: 10.1039/c7qi00532f
Haifeng Gao _{1,

2,

3,

4,

5} , Zhiwei Yao _{1,

2,

3,

4,

5} , Yan Shi _{1,

2,

3,

4,

5} , Renren Jia _{4,

5,

6} , Feixue Liang _{1,

2,

3,

4,

5} , Yue Sun _{1,

2,

3,

4,

5} , Wei Mao _{1,

2,

3,

4,

5} , Haiyan Wang _{1,

2,

3,

4,

5}

Affiliation

In this work, we propose a facile, fast and large-scale synthesis of β-Mo₂C catalysts (about 100 grams). The current approach uses a simple solid mixture of (NH₄)₆Mo₇O₂₄·4H₂O and carbon nanotubes (CNTs) as a precursor and employs a fast heating rate method without holding time. Moreover, there was no need for passivating the carbide products. A series of β-Mo₂C/CNT catalysts (denoted as MoC-5, -15, -30 and -60) were successfully prepared from the precursors with the Mo content ranging from 5 to 60 wt% and their catalytic activities for dry reforming of methane (DRM) were evaluated. CH₄-TPSR and CO₂-TPO over the fresh samples proved that the abilities of CH₄ dissociation and oxidation resistance of β-Mo₂C were greatly enhanced by compositing with CNTs. It was also found that these abilities were dependent on the Mo content, the particle size and the interaction between β-Mo₂C and CNTs. Among these β-Mo₂C/CNT catalysts, MoC-30 showed the best catalytic stability for DRM, attributed to its high activity for CH₄ dissociation and high resistance to oxidation. Additionally, it is worth noting that the catalytic stability of monometallic MoC-30 was found to be superior to that of bimetallic Ni/β-Mo₂C (recently known to be an efficient non-noble metal catalyst for DRM).

中文翻译：

简单，大规模合成β相碳化钼作为甲烷干重整的高度稳定的催化剂

在这项工作中，我们提出了一个轻便，快速和β-莫大规模合成₂ C催化剂（约100克）。当前的方法使用（NH ₄）₆ Mo ₇ O ₂₄ ·4H ₂ O和碳纳米管（CNT）的简单固体混合物作为前体，并采用快速加热速率方法而没有保持时间。而且，不需要钝化碳化物产品。一系列β-Mo系的₂已成功地从与Mo含量为5〜60重量％前体和它们的干催化活性制备C / CNT催化剂（表示为MOC-5，-15，-30和-60）评估了甲烷的重整（DRM）。CH ₄ -TPSR和CO ₂-TPO在新鲜样品证明，CH的能力₄离解和β-Mo系的抗氧化性₂ C下大大通过用碳纳米管合成增强。人们还发现，这些能力都依赖于Mo含量，粒度和β-Mo系之间的相互作用₂ C和碳纳米管。在这些β-沫₂ C / CNT催化剂，MOC-30显示出对DRM最好的催化稳定性，这归因于它的高活性CH ₄离解和氧化高抵抗性。此外，值得注意的是，单金属MOC-30的催化稳定性被认为是优于双金属镍/β-沫的₂ C（最近已知可用于DRM的高效的非贵金属催化剂）。

更新日期：2017-11-09

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