Impact of Pyrolysis Temperature on Charcoal Characteristics

作者：Johannes Tintner, Christoph Preimesberger, Christoph Pfeifer, Denis Soldo, Franz Ottner, Karin Wriessnig, Harald Rennhofer, Helga C. Lichtenegger, E. H. Novotny, E. Smidt · 发表于：Industrial & Engineering Chemistry Research · 年份：2018 · DOI：10.1021/acs.iecr.8b04094 · 被引用次数：49 · 研究领域：Thermochemical Biomass Conversion Processes、Lignin and Wood Chemistry、Flame retardant materials and properties

Charcoals were produced from spruce and beech wood under laboratory conditions at different pyrolysis temperatures (300–1300 °C). Characterization of these charcoals was conducted using eight analytical methods. Each method describes specific changes in the temperature range until 1300 °C. Therefore, the combination of these methods provides comprehensive information on different pyrolysis stages. Fourier transform infrared (FTIR) spectroscopy, NMR spectroscopy, and thermogravimetry display changes until 700 °C. A prediction model for pyrolysis temperature until 800 °C is presented based on FTIR spectra with an R 2 of 0.98. He-pycnometry resolves the temperature range between 500 and 890 °C. Small angle X-ray scattering (SAXS) describes precisely the evolution of the porous structure and completes the set of techniques by a description of the physical properties of the charcoal. X-ray diffraction (XRD) reveals the crystallographic change of the lignocellulosic structure toward precursors of graphite. The formation of calcite out of CaO and CO 2 becomes evident.