Low-temperature catalytic oxidation of multi-walled carbon nanotubes

Anne-Riikka Leino; Melinda Mohl; Jarmo Kukkola; Päivi Mäki-Arvela; Tommi Kokkonen; Andrey Shchukarev; Krisztian Kordas

doi:10.1016/j.carbon.2013.01.040

Low-temperature catalytic oxidation of multi-walled carbon nanotubes

Anne-Riikka Leino
, Melinda Mohl
, Jarmo Kukkola
, Päivi Mäki-Arvela
, Tommi Kokkonen
, Andrey Shchukarev
, Krisztian Kordas^*

^*Korresponderande författare för detta arbete

Åbo Akademi

Forskningsoutput: Tidskriftsbidrag › Artikel › Vetenskaplig › Peer review

24 Citeringar (Scopus)

Sammanfattning

When in a pure form, carbon nanotubes are known to be stable in air up to ∼800 K making them attractive for a large variety of applications. In this work, we report a significant decrease of ignition temperature (in some cases occurring at ∼500 K) and a reduction in the apparent activation energy for oxidation in air as a result of impregnation with nanoparticles (<2 nm) of metal (Pt, Pd, Ni and Co) acetylacetonates or by decoration with corresponding oxides. Surprisingly, defects introduced by partial oxidation of the carbon nanotubes do not in practice have any influence on the enhancement of further oxidation. Reduction temperatures of metal oxides with H₂ were close to those of other carbon supported catalyst materials. However, the carbon nanotubes showed a tendency for low temperature gasification in the presence of hydrogenation catalyst metals (Pt, Pd).

Originalspråk	Engelska
Sidor (från-till)	99-107
Antal sidor	9
Tidskrift	Carbon
Volym	57
DOI	https://doi.org/10.1016/j.carbon.2013.01.040
Status	Publicerad - juni 2013
MoE-publikationstyp	A1 Tidskriftsartikel-refererad

Finansiering

The authors would like to thank Prof. Arthur E. Hill (Univ. Salford) and Dr. Robert Vajtai (Rice Univ.) for their valuable comments on the manuscript. We thank Jarkko Puustinen (Univ. Oulu) and Peter Pusztai (Univ. Szeged) for assisting with XRD and TGA measurements, respectively. A.-R. Leino is grateful for the post-graduate position and for the personal grants received from Graduate School in Electronics, Telecommunications and Automation, Emil Aaltonen and Tauno Tönning foundations. The work was supported by projects Urakamu2 (Tekes), Rocaname (Academy of Finland), Thema-CNT (EU FP7) and Napep (EU FP7).

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title = "Low-temperature catalytic oxidation of multi-walled carbon nanotubes",

abstract = "When in a pure form, carbon nanotubes are known to be stable in air up to ∼800 K making them attractive for a large variety of applications. In this work, we report a significant decrease of ignition temperature (in some cases occurring at ∼500 K) and a reduction in the apparent activation energy for oxidation in air as a result of impregnation with nanoparticles (<2 nm) of metal (Pt, Pd, Ni and Co) acetylacetonates or by decoration with corresponding oxides. Surprisingly, defects introduced by partial oxidation of the carbon nanotubes do not in practice have any influence on the enhancement of further oxidation. Reduction temperatures of metal oxides with H2 were close to those of other carbon supported catalyst materials. However, the carbon nanotubes showed a tendency for low temperature gasification in the presence of hydrogenation catalyst metals (Pt, Pd).",

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AU - Leino, Anne-Riikka

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AU - Kokkonen, Tommi

AU - Shchukarev, Andrey

AU - Kordas, Krisztian

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N2 - When in a pure form, carbon nanotubes are known to be stable in air up to ∼800 K making them attractive for a large variety of applications. In this work, we report a significant decrease of ignition temperature (in some cases occurring at ∼500 K) and a reduction in the apparent activation energy for oxidation in air as a result of impregnation with nanoparticles (<2 nm) of metal (Pt, Pd, Ni and Co) acetylacetonates or by decoration with corresponding oxides. Surprisingly, defects introduced by partial oxidation of the carbon nanotubes do not in practice have any influence on the enhancement of further oxidation. Reduction temperatures of metal oxides with H2 were close to those of other carbon supported catalyst materials. However, the carbon nanotubes showed a tendency for low temperature gasification in the presence of hydrogenation catalyst metals (Pt, Pd).

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Low-temperature catalytic oxidation of multi-walled carbon nanotubes

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