Oxidative purification of carbon nanotubes and its impact on catalytic performance in oxidative dehydrogenation reactions

ChemSusChem
Ali RinaldiRobert Schlögl

Abstract

Oxidative purification with mild diluted HNO3 followed by NaOH washing lowers the amount of amorphous carbon attached to multiwalled carbon nanotubes (CNTs). The graphitic structure improves remarkably by further annealing in argon at elevated temperatures, that is, 1173, 1573, and 1973 K. The influence of the purification treatment on the catalytic activity of the CNTs is investigated for the oxidative dehydrogenation (ODH) of ethylbenzene and propane as probe reactions. All samples tend to approach an appropriately ordered structure and Raman analysis of the used samples displays a D/G band ratio of 0.95-1.42. 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 the catalytic performance as it allows for unwanted functional groups occurring in parallel with the formation of the selective (di)ketonic active sites.

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Aug 12, 2009·Angewandte Chemie·Benjamin FrankDang Sheng Su
Oct 17, 2009·ChemSusChem·Dang Sheng Su

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Citations

Feb 7, 2014·Chemical Society Reviews·Xiang-Kai KongQian-Wang Chen
May 13, 2014·Physical Chemistry Chemical Physics : PCCP·Hua YuanDang Sheng Su
Oct 11, 2011·Chemistry : a European Journal·Bingsen ZhangRobert Schlögl
Aug 20, 2011·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Benjamin FrankRobert Schlögl
Sep 28, 2012·Chemistry, an Asian Journal·Yong GuoNiveen M Khashab
Jul 7, 2011·ChemSusChem·Jean-Philippe Tessonnier, Dang Sheng Su
Apr 4, 2015·Nature Communications·Huimin YangFeng Shi
Dec 11, 2020·Chemical Society Reviews·Jian ShengAn-Hui Lu

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