Role of Carbon Order in Structural Transformations and Hydrogen Evolution Induced by Reactive Ball Milling in Cyclohexene

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• 作者：Apurba Sakti ; Nichole M. Wonderling ; Caroline E. B. Clifford ; John V. Badding ; Angela D. Lueking
• 刊名：Journal of Physical Chemistry C
• 出版年：2008
• 出版时间：November 6, 2008
• 年：2008
• 卷：112
• 期：44
• 页码：17427-17435
• 全文大小：281K
• 年卷期：v.112,no.44(November 6, 2008)
• ISSN：1932-7455

文摘

Demineralized Summit (DS) anthracite, DS annealed at 1673 K, and graphite are used to explore the effect of precursor order on structural transformations and H₂ evolution that result during reactive ball milling. Carbon structure was assessed before and after milling with temperature-programmed oxidation, X-ray diffraction (XRD), ultraviolet Raman spectroscopy, N₂ adsorption, He density, and solvent swelling. Graphite milled in cyclohexene is primarily nanocrystalline graphite, with 8 wt % amorphous content leading to low-temperature oxidation, swelling, increased surface area, and mesoporosity. Milling the disordered DS leads to signs of increased sp² clustering, increased cross-linking, a significant ultramicroporosity with pores less than 8 Å, and low-temperature H₂ evolution. The carbon fraction of annealed DS behaves similarly to graphite in the mill.