Chemistry of Materials · 2010 · 99 citations · 45 references
Natural SciencesMaterials EngineeringMaterials ScienceCatalysisMaterials ChemistryNanomaterialsCarbon NanomaterialsCarbon NanotubesCatalyst StabilityNanocatalysisNanotubesSurface OxidationCarbon MaterialsCarbon Nanomaterial CharacterizationCarbon-based CatalystsMulti-walled Carbon NanotubesOxidationOxidation StabilityOxidative CatalysisOxidative Degradation Studies
The oxidation of multiwalled carbon nanotubes (CNTs) was investigated with regard to a detailed prediction of the lifetime of this material as a catalyst for oxidative dehydrogenations. A power-law kinetics is found to be adequate for the description of CO 2 formation in the temperature range of 623−823 K and under O 2 partial pressures of 0.025−0.6 bar. The stability against oxidation can be enhanced by passivation with B 2 O 3 or P 2 O 5 and by high temperature treatment. The progress of oxidative degradation was monitored by TEM and Raman spectroscopy. A mechanistic study supported by high pressure XPS and SSITKA reveals full agreement with the established model of the oxidation of conventional carbon materials; however, the theory of sequential layer degradation as observed for single crystal graphite is not transferable to a technical grade CNT material, and instead, various modes of propagation of combustion sites are identified.
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Opening carbon nanotubes with oxygen and implications for filling
P. M. Ajayan, Thomas W. Ebbesen, T. Ichihashi et al. · Nature · 1993 · 1K citations
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