Efficient Catalysts for Cyclohexane Dehydrogenation Synthesized by Mo-Promoted Growth of 3D Block Carbon Coupled with Mo2C,ACS Omega

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Efficient Catalysts for Cyclohexane Dehydrogenation Synthesized by Mo-Promoted Growth of 3D Block Carbon Coupled with Mo2C
ACS Omega ( IF 3.7 ) Pub Date : 2018-09-07 00:00:00 , DOI: 10.1021/acsomega.8b01411
Hui Wang ₁ , Na Zhang ₁ , Rui Liu ₁ , Ruihua Zhao _{1,

2} , Tianyu Guo _{3,

4} , Jinping Li _{1,

4} , Tewodros Asefa _{5,

6} , Jianping Du _{1,

4}

Affiliation

Cyclohexane can serve as a good dihydrogen (H₂) carrier and a safer medium to store and transport H₂, as it is liquid under ambient conditions and it has a relatively high hydrogen density per unit volume (0.056 g(H₂)/cm³(Cy)_liq.). However, cyclohexane can release H₂ only with efficient cyclohexane dehydrogenation catalysts. Here, we report the synthesis of three-dimensional micron-sized block carbon–molybdenum carbide (BCMC) composite materials that can serve as noble-metal-free catalysts for cyclohexane dehydrogenation. The materials are synthesized by a facile hydrothermal synthetic route, and their structures and morphologies are characterized by various analytical techniques. The results show that the BCMCs, along with specific morphologies, form when a source of Mo is included in the precursor and that the sizes of the microparticles in them can be tailored by changing the relative amount of Mo used for their synthesis. The as-synthesized BCMC materials exhibit high catalytic activity for cyclohexane dehydrogenation while remaining stable and maintaining their catalytic activities during the reaction. The materials’ catalytic activity increases as the amount of Mo used to make the materials is increased. This is further found to be because the BCMC materials containing higher amounts of ammonium molybdate or higher densities of Mo₂C provide substantially lower activation energies for the reaction. These materials can be expected to find industrial applications for catalytic production of H₂ from hydrocarbons.

中文翻译：

钼促进3D嵌段碳与Mo ₂ C偶联生长合成环己烷脱氢的高效催化剂

环己烷可以作为良好的二氢（H ₂）载体和更安全的介质来存储和运输H ₂，因为它在环境条件下为液态，并且每单位体积的氢密度较高（0.056 g（H ₂）/ cm ³（Cy）_liq。）。但是，环己烷会释放H ₂仅使用有效的环己烷脱氢催化剂。在这里，我们报告了三维微米级的块状碳钼碳化物（BCMC）复合材料的合成，这些材料可用作环己烷脱氢的无贵金属催化剂。这些材料是通过简便的水热合成途径合成的，其结构和形态通过各种分析技术来表征。结果表明，当前驱体中包含Mo来源时，会形成BCMC和特定的形态，并且可以通过更改用于合成的Mo的相对量来定制其中的微粒尺寸。合成后的BCMC材料对环己烷脱氢显示出高催化活性，同时保持稳定并在反应过程中保持其催化活性。随着用于制造材料的Mo量的增加，材料的催化活性也增加。进一步发现这是因为BCMC材料包含较高数量的钼酸铵或较高密度的Mo₂ C为反应提供了实质上较低的活化能。可以预期这些材料将用于从烃催化生产H _2的工业应用中。

更新日期：2018-09-07

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