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

ID: 434626.0, Fritz-Haber-Institut / Inorganic Chemistry
Oxidative Purification of Carbon Nanotubes and Its Impact on Catalytic Performance in Oxidative Dehydrogenation Reactions
Authors:Rinaldi, Ali; Zhang, Jian; Frank, Benjamin; Su, Dang Sheng; Abd Hamid, Sharifah Bee; Schlögl, Robert
Research Context:Carbon
Date of Publication (YYYY-MM-DD):2010
Title of Journal:ChemSusChem
Issue / Number:2
Start Page:254
End Page:260
Title of Issue:MPI EnerChem
Copyright:© 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:Oxidative purification with mild diluted HNO3 followed by NaOH washing lowers the amount of amorphous carbon deposited at multiwalled carbon nanotubes (CNTs). The graphitic structure can be remarkably improved by further annealing in Ar at elevated temperatures, i.e. 1173, 1573, and 1973 K. The influence of the purification treatment on the catalytic activity of the CNTs was investigated for the oxidative dehydrogenation (ODH) of ethylbenzene and propane as probe reactions. All samples tend to approach an appropriately ordered structure and the used samples display an almost same ratio of D band to G band of 0.95-1.42 in Raman spectra. Oxygen functionalities are partly removed by the annealing treatment and can be rebuilt to some extent by oxygen molecules in the ODH reactant flow. The presence of amorphous carbon is detrimental to catalytic performance as it allows for unwanted functional groups occurring in parallel with the formation of the desired active sites.
Free Keywords:carbon; catalysis; dehydrogenation; nanotubes; oxidation
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/Inorganic Chemistry
External Affiliations:Combinatorial Technologies and Catalysis Research Centre (COMBICAT), University of Malaya, 50603 Kuala Lumpur, Malaysia
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