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          Institute: Fritz-Haber-Institut     Collection: Inorganic Chemistry     Display Documents



  history
ID: 493962.0, Fritz-Haber-Institut / Inorganic Chemistry
Oxidation Stability of Multiwalled Carbon Nanotubes for Catalytic Applications
Authors:Frank, Benjamin; Rinaldi, Ali; Blume, Raoul; Schlögl, Robert; Su, Dang Sheng
Language:English
Date of Publication (YYYY-MM-DD):2010-07-14
Title of Journal:Chemistry of Materials
Journal Abbrev.:Chem. Mater.
Volume:22
Issue / Number:15
Start Page:4462
End Page:4470
Copyright:© 2010 American Chemical Society
Review Status:Peer-review
Audience:Experts Only
Abstract / Description: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 CO2 formation in the temperature range of 623−823 K and under O2 partial pressures of 0.025−0.6 bar. The stability against oxidation can be enhanced by passivation with B2O3 or P2O5 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.
Free Keywords:multiwalled CNTs; catalyst; ODH
Research Context: Carbon
External Publication Status:published
Document Type:Article
Communicated by:Robert Schlögl
Affiliations:Fritz-Haber-Institut/Inorganic Chemistry/Micro- and Nanostructure / Carbon
Fritz-Haber-Institut/Inorganic Chemistry/Electronic Structure and Adsorption / Metals
Fritz-Haber-Institut/Inorganic Chemistry/Inorganic Chemistry
Identifiers:URL:http://dx.doi.org/10.1021/cm101234d [only for subscriber]
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