Fabricating [email protected] Carbon Catalysts via a Thermal Method,ACS Catalysis

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Fabricating [email protected] Carbon Catalysts via a Thermal Method
ACS Catalysis ( IF 11.3 ) Pub Date : 2018-06-20 00:00:00 , DOI: 10.1021/acscatal.8b01644
Yueling Cao _{1,

2} , Bowen Zhao ₁ , Xiaobing Bao ₁ , Yong Wang ₁

Affiliation

Nanoparticles (NPs) encapsulated with carbon material have been proven particularly successful for improving their stability; however, this carbon-coating strategy is a compromise between activity and stability because these carbon shells also reduce, even deactivate, the activity of the catalyst by blocking active sites. Herein, we report a procedure to effectively remove the carbon layer without affecting particle morphology, which enhances the surface exposure of the nanoparticles and their catalytic activity while retaining their stability. The heat treatment, such as reduction in hydrogen atmosphere or calcination in air atmosphere, could destroy the defective carbon-surrounded Ru NPs through making the methanation or oxidation reaction occur on the carbon material surface. More importantly, the heat treatment in air atmosphere at low temperature exhibited higher power to corrode the defective carbon-surrounded Ru NPs in comparison with the heat treatment in hydrogen atmosphere. We anticipate that this defective carbon removal approach has more general applicability to encapsulated metal NPs and should lead to improvements in fields as diverse as chemicals production and environmental protection.

中文翻译：

通过热方法制造[受电子邮件保护的]碳催化剂

事实证明，用碳材料包封的纳米颗粒（NP）在改善其稳定性方面尤为成功。然而，这种碳包被策略是活性和稳定性之间的折衷，因为这些碳壳还通过封闭活性位而降低了催化剂的活性，甚至使其失活。本文中，我们报告了一种在不影响颗粒形态的情况下有效去除碳层的程序，该过程增强了纳米颗粒的表面暴露能力及其催化活性，同时又保持了其稳定性。诸如氢气氛的还原或空气气氛中的煅烧之类的热处理可通过使甲烷化或氧化反应发生在碳材料表面上而破坏有缺陷的被碳包围的Ru NP。更重要的是，与在氢气氛中进行的热处理相比，在空气气氛中进行的低温热处理表现出更高的功率来腐蚀有缺陷的碳包围的Ru NPs。我们预计这种有缺陷的除碳方法在封装的金属NP上具有更广泛的适用性，并应导致化学品生产和环境保护等各个领域的改进。

更新日期：2018-06-20

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