The pyrolysis of the lignocellulosic biomass is a promising process to produce biofuels or green chemicals. Specific analytical methods have to be developed in order to better understand the composition of biomass and of its pyrolysis products and therefore to optimize the design of pyrolysis processes. For this purpose, different biomasses (Douglas and Miscanthus) and one biochar were analyzed by laser desorption/ionization Fourier transform ion cyclotron resonance mass spectrometry (LDI FT-ICR MS). This method allowed the biomass and biochar to be analyzed without any sample preparation and with a spatial resolution of about 100 μm. The influence of LDI conditions (laser wavelength and laser irradiance) and the nature of the biomass and biochar on the obtained mass spectrum were investigated. The nature and origin of the observed ions highly depended on LDI conditions. In the softest laser-biomass interaction conditions (low laser irradiance), the detected ions were related to the nature of the investigated biomass. Indeed, the main part of the detected species came from the different biomass subunits and was produced by photolysis of covalent bonds. When more severe laser irradiation conditions were used, the obtained mass spectra gathered the ions relative to (i) the chemical components of the investigated samples, (ii) the recombination products of these species in the gas phase after their ejection from the sample surface, and (iii) the compounds produced by laser pyrolysis of the sample. This was expected to be useful to mimic thermal pyrolysis. Graphical Abstract.
Keywords: Biochar; Biomass; Laser desorption; Lignin; UV laser pyrolysis.
Comparative Study of Graphite-Supported LDI- and ESI-FT-ICR-MS of a Pyrolysis Liquid from a German Brown Coal.Anal Chem. 2015 Aug 4;87(15):7618-27. doi: 10.1021/acs.analchem.5b00693. Epub 2015 Jul 16. Anal Chem. 2015. PMID: 26143658
Comparison of sample pre-treatments for laser desorption ionization and secondary ion mass spectrometry imaging of Miscanthus x giganteus.Bioresour Technol. 2010 Jul;101(14):5578-85. doi: 10.1016/j.biortech.2010.01.136. Epub 2010 Feb 19. Bioresour Technol. 2010. PMID: 20171881
Co-pyrolysis of lignocellulosic and macroalgae biomasses for the production of biochar - A review.Bioresour Technol. 2020 Feb;297:122408. doi: 10.1016/j.biortech.2019.122408. Epub 2019 Nov 12. Bioresour Technol. 2020. PMID: 31767426 Review.
Off-line comprehensive size exclusion chromatography × reversed-phase liquid chromatography coupled to high resolution mass spectrometry for the analysis of lignocellulosic biomass products.J Chromatogr A. 2020 Jan 4;1609:460505. doi: 10.1016/j.chroma.2019.460505. Epub 2019 Sep 2. J Chromatogr A. 2020. PMID: 31500881
Fates of Chemical Elements in Biomass during Its Pyrolysis.Chem Rev. 2017 May 10;117(9):6367-6398. doi: 10.1021/acs.chemrev.6b00647. Epub 2017 Mar 24. Chem Rev. 2017. PMID: 28337906 Review.