Conversion of Secondary C3-C4 Aliphatic Alcohols on Carbon Nanotubes Consolidated by Spark Plasma Sinteringстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Web of Science
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 12 января 2022 г.
Аннотация:We analyze how the changes in the dimension of carbon nanomaterial (CNM) affect theircatalytic conversion of secondary aliphatic alcohols. Carbon nanotubes (CNTs) consolidated by sparkplasma sintering (SPS) were inactive in the conversion of secondary C3-C4 aliphatic alcohols becauseof the «healing» of defects in carbon structure during SPS. Gas-phase treatment of consolidated CNTswith 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 increasedfrom 11.3 to 14.9 at. % with increasing the oxidation time from 3 to 6 h. Despite the decrease in thespecific surface area, the oxidized samples showed enhanced catalytic activity in alcohol conversionbecause of the increased number of oxygen radicals with unpaired electrons, which was establishedby electron paramagnetic resonance spectroscopy. We conclude that the structure of CNM determinesthe content and/or ratio of sp2 and sp3-hybridized carbon atoms in the material. The experimentaland literature data demonstrated that sp3-hybridized carbon atoms on the surface are probably thepreferable site for catalytic conversion of alcohols.