Effect of Potassium on the Mechanisms of Biomass Pyrolysis Studied using Complementary Analytical Techniques

Le Brech, Yann; Ghislain, Thierry; Leclerc, S�bastien; Bouroukba, Mohammed; Delmotte, Luc; Brosse, Nicolas; Snape, Colin; Chaimbault, Patrick; Dufour, Anthony

Abstract

Complementary analytical methods have been used to study the effect of potassium on the pyrolysis mechanisms of cellulose and lignocellulosic biomasses. Thermogravimetry, calorimetry, high-temperature 1H NMR spectroscopy (in situ and real-time analysis of the fluid phase formed during pyrolysis), and water extraction of quenched char followed by size-exclusion chromatography coupled with mass spectrometry have been combined. Potassium impregnated in cellulose suppresses the formation of anhydrosugars, reduces the formation of mobile protons, and gives rise to a mainly exothermic signal. The evolution of mobile protons formed from K-impregnated cellulose has a very similar pattern to the evolution of the mass loss rate. This methodology has been also applied to analyze miscanthus, demineralized miscanthus, miscanthus re-impregnated with potassium after demineralization, raw oak, and Douglas fir. Hydrogen mobility and transfer are of high importance in the mechanisms of biomass pyrolysis.

Citation

Le Brech, Y., Ghislain, T., Leclerc, S., Bouroukba, M., Delmotte, L., Brosse, N., …Dufour, A. (2016). Effect of Potassium on the Mechanisms of Biomass Pyrolysis Studied using Complementary Analytical Techniques. ChemSusChem, 9(8), 863-872. https://doi.org/10.1002/cssc.201501560

• Journal Article Type: Article
• Acceptance Date: Nov 30, 2015
• Online Publication Date: Mar 15, 2016
• Publication Date: Apr 21, 2016
• Deposit Date: Jun 7, 2017
• Publicly Available Date: Jun 7, 2017
• Journal: ChemSusChem
• Print ISSN: 1864-5631
• Electronic ISSN: 1864-564X
• Publisher: Wiley
• Peer Reviewed: Peer Reviewed
• Volume: 9
• Issue: 8
• Pages: 863-872
• DOI: https://doi.org/10.1002/cssc.201501560
• Keywords: biomass; in situ analysis; nmr spectroscopy; potassium; reaction mechanisms
• Public URL: https://nottingham-repository.worktribe.com/output/784189
• Publisher URL: http://onlinelibrary.wiley.com/doi/10.1002/cssc.201501560/full
• Additional Information: This is the peer reviewed version of the following article: Y. Le Brech, T. Ghislain, S. Leclerc, M. Bouroukba, L. Delmotte, N. Brosse, C. Snape, P. Chaimbault, A. Dufour, ChemSusChem 2016, 9, 863, which has been published in final form at http://dx.doi.org/10.1002/cssc.201501560. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.