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High resolution mass spectrometry for molecular characterization of bio-oils produced by pyrolysis of lignocellulosic biomass

Abstract : The products of lignocellulosic biomass pyrolysis are potential sources of renewable materials such as bio-fuels, biochars, and chemicals. However, their ready-to-use capacity is limited by their high chemical complexity and their high oxygen content. Therefore, they have to be upgraded by different treatments such as deoxygenation and/or cracking. In order to assess the most suited upgrading process, it is necessary to obtain an extensive composition description of the raw pyrolysis products. The works carried out during this PhD thesis are dealing with the development of though analytical methods to reach the most detailed composition description of bio-oils. This study was performed by Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) using different ionization sources. The electrospray ionization (ESI), in controlled-conditions, ensures to ionize the cellulose and the hemicellulose derived compounds as well as the lipids and the lignin derivatives. The atmospheric pressure photoionisation (APPI) and the laser desorption/ionization (LDI) allow specifically to detect more unsaturated pyrolytic lignin species. The combination of the different results ensures to obtain an extensive bio-oil description. The established methodology was applied to raw and upgraded (catalytic deoxygenation/cracking treatment on different zeolites) bio-oils. The ESI FT-ICR MS measurements evidenced the selectivity of the used catalysts on sugaric compounds whereas the APPI and LDI highlighted the nature of the resulting compounds which are less oxygenated and produced, for a part of them, by catalytic cracking
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Submitted on : Tuesday, January 14, 2020 - 10:37:36 AM
Last modification on : Wednesday, November 3, 2021 - 7:09:26 AM
Long-term archiving on: : Wednesday, April 15, 2020 - 3:20:03 PM


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  • HAL Id : tel-01905674, version 1


Jasmine Hertzog. High resolution mass spectrometry for molecular characterization of bio-oils produced by pyrolysis of lignocellulosic biomass. Chemical engineering. Université de Lorraine, 2017. English. ⟨NNT : 2017LORR0180⟩. ⟨tel-01905674⟩



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