Evidence for Ambient-Temperature Reversible Catalytic Hydrogenation in Pt-doped Carbons

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• 作者：Xiao Ming Liu ; Youjian Tang ; En Shi Xu ; Thomas C. Fitzgibbons ; Gregory S. Larsen ; Humberto R. Gutierrez ; Huan-Hsiung Tseng ; Ming-Sheng Yu ; Cheng-Si Tsao ; John V. Badding ; Vincent H. Crespi ; Angela D. Lueking
• 刊名：Nano Letters
• 出版年：2013
• 出版时间：January 9, 2013
• 年：2013
• 卷：13
• 期：1
• 页码：137-141
• 全文大小：340K
• 年卷期：v.13,no.1(January 9, 2013)
• ISSN：1530-6992

文摘

In situ high-pressure Raman spectroscopy, with corroborating density functional calculations, is used to probe C鈥揌 chemical bonds formed when dissociated hydrogen diffuses from a platinum nanocatalyst to three distinct graphenic surfaces. At ambient temperature, hydrogenation and dehydrogenation are reversible in the combined presence of an active catalyst and oxygen heteroatoms. Hydrogenation apparently occurs through surface diffusion in a chemisorbed state, while dehydrogenation requires diffusion of the chemisorbed species back to an active catalyst.

Keywords:

Graphene; graphane; Pt nanoparticles; hydrogen; spillover; catalysis