Conversion of Secondary C3-C4 Aliphatic Alcohols on Carbon Nanotubes Consolidated by Spark Plasma Sintering
| Autor: | Oksana Ya. Isaikina, Konstantin I. Maslakov, Yuriy Zhitnev, Vsevolod Epishev, E. V. Suslova, Alexander N. Ulyanov, E. A. Tveritinova, Serguei V. Savilov |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
General Chemical Engineering Radical chemistry.chemical_element Spark plasma sintering Carbon nanotube Oxygen Article law.invention Catalysis lcsh:Chemistry X-ray photoelectron spectroscopy law Specific surface area General Materials Science gas-phase oxidation carbon nanotubes dehydration secondary alcohols chemistry Chemical engineering lcsh:QD1-999 activation energy dehydrogenation electronic paramagnetic resonance Carbon spark plasma sintering catalyst |
| Zdroj: | Nanomaterials Volume 11 Issue 2 Nanomaterials, Vol 11, Iss 352, p 352 (2021) |
| ISSN: | 2079-4991 |
| DOI: | 10.3390/nano11020352 |
| Popis: | We analyze how the changes in the dimension of carbon nanomaterial (CNM) affect their catalytic conversion of secondary aliphatic alcohols. Carbon nanotubes (CNTs) consolidated by spark plasma sintering (SPS) were inactive in the conversion of secondary C3-C4 aliphatic alcohols because of the «healing» of defects in carbon structure during SPS. Gas-phase treatment of consolidated CNTs with HNO3 vapors led to their surface oxidation without destruction of the bulk structure of pellets. The oxygen content in consolidated CNTs determined by X-ray photoelectron spectroscopy increased from 11.3 to 14.9 at. % with increasing the oxidation time from 3 to 6 h. Despite the decrease in the specific surface area, the oxidized samples showed enhanced catalytic activity in alcohol conversion because of the increased number of oxygen radicals with unpaired electrons, which was established by electron paramagnetic resonance spectroscopy. We conclude that the structure of CNM determines the content and/or ratio of sp2 and sp3-hybridized carbon atoms in the material. The experimental and literature data demonstrated that sp3-hybridized carbon atoms on the surface are probably the preferable site for catalytic conversion of alcohols. |
| Databáze: | OpenAIRE |
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