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Chemical characterization of lignocellulosic materials by analytical pyrolysis
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Orientador(es)
Resumo(s)
Analytical pyrolysis is used to chemically study complex molecular materials
and is applied in a wide range of fields. Pyrolysis is a thermochemical process
associated to the breaking of chemical bonds using thermal energy, transforming
a nonvolatile compound into a volatile degradation mixture. This chapter
refers to analytical pyrolysis of lignocellulosic materials, i.e., when pyrolysis is
used for chemical characterization, applied to samples with small particle sizes,
at 500–650°C, and with short residence times. The reactions that occur during
pyrolysis of the structural components are discussed regarding the mechanisms
and the pyrolysis products obtained from cellulose, hemicelluloses, and lignin.
A compilation of data is made on the characterization of lignocellulosic materials
using Py-GC/FID(MS) or Py-GC/MS as analytical tools including woods and
barks of several species. The pyrogram profiles and important parameters on lignin
chemical composition such as the H:G:S relation and the S/G ratio are summarized.
Analytical pyrolysis is a versatile methodology that may be applied to characterize
the lignin directly on the lignocellulosic material or after isolation from the cell wall
matrix (e.g., as MWL or dioxane lignin) or from pulps or spent liquors. It is therefore
an excellent tool to study lignin compositional variability in different materials
and along various processing pathways.
Descrição
Palavras-chave
Py-GC/MS wood barks lignin cellulose H:G:S relation S/G ratio
Contexto Educativo
Citação
Lourenço, A., Gominho, J., & Pereira, H. (2018). Chemical characterization of lignocellulosic materials by analytical pyrolysis. IntechOpen. doi: 10.5772/intechopen.80556
Editora
IntechOpen