Chemical Shifts and Lifetimes for Nuclear Magnetic Resonance (NMR) Analysis of Biofuels

摘要: Determination of the molecular composition biofuels is critical to process development. Because biofuels, such as pyrolysis oil, contain hundreds compounds, quantitative determination mixtures a formidable task and often not necessary for routine development work. 13C 1H nuclear magnetic resonance (NMR) offer reasonable trade-off between functional group identification analytical measurement effort. However, accuracy depends upon selection chemical-shift regions, baseline compensation, correction incomplete longitudinal relaxation effects. We propose assignments T1 factors based on NMR measurements over 50 compounds that have been previously identified in oils several plant natural products, especially terpenes. The results are intended allow semiquantitative assessment bio-oils time scale 1−8 h provide feedback