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- W2554039462 abstract "Solid-state 13 C nuclear magnetic resonance (NMR) spectroscopy was used in this work to analyze the physical and chemical properties of plasma blacks and carbon deposits produced by thermal cracking of natural gas using different types of plasma reactors. In a typical configuration with a double-chamber reactor, N 2 or Ar was injected as plasma working gas in the first chamber and natural gas was injected in the second chamber, inside the arc column. The solid residue was collected at different points throughout the plasma apparatus and analyzed by 13 C solid-state NMR spectroscopy, using either cross polarization (CP) or direct polarization (DP), combined with magic angle spinning (MAS). The 13 C CP/MAS NMR spectra of a number of plasma blacks produced in the N 2 plasma reactor showed two resonance bands, broadly identified as associated with aromatic and aliphatic groups, with indication of the presence of oxygen- and nitrogen-containing groups in the aliphatic region of the spectrum. In contrast to DP experiments, only a small fraction of 13 C nuclei in the plasma blacks are effectively cross-polarized from nearby 1 H nuclei and are thus observed in spectra recorded with CP. 13 C NMR spectra are thus useful to distinguish between different types of carbon species in plasma blacks and allow a selective study of groups spatially close to hydrogen in the material." @default.
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- W2554039462 date "2016-01-01" @default.
- W2554039462 modified "2023-09-26" @default.
- W2554039462 title "Solid-State <sup>13</sup>C NMR Spectroscopy Applied to the Study of Carbon Blacks and Carbon Deposits Obtained by Plasma Pyrolysis of Natural Gas" @default.
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- W2554039462 doi "https://doi.org/10.1155/2016/1543273" @default.
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