title: Effect of Potassium on the Mechanisms of Biomass Pyrolysis Studied using Complementary Analytical Techniques.
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 (1) H 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.
authors.affiliation: Reactions and processes Engineering laboratory, CNRS, Université de Lorraine, ENSIC, 1 rue Grandville, B.P.20451 54000, Nancy Cedex, France.
authors.forename: Yann
authors.initials: Y
authors.lastname: Le Brech
authors.affiliation: Reactions and processes Engineering laboratory, CNRS, Université de Lorraine, ENSIC, 1 rue Grandville, B.P.20451 54000, Nancy Cedex, France.
authors.forename: Thierry
authors.initials: T
authors.lastname: Ghislain
authors.affiliation: LEMTA, CNRS, Université de Lorraine, BP 54506, Vandoeuvre lès Nancy, France.
authors.forename: Sébastien
authors.initials: S
authors.lastname: Leclerc
authors.affiliation: Reactions and processes Engineering laboratory, CNRS, Université de Lorraine, ENSIC, 1 rue Grandville, B.P.20451 54000, Nancy Cedex, France.
authors.forename: Mohammed
authors.initials: M
authors.lastname: Bouroukba
authors.affiliation: IS2M, CNRS, Université de Haute Alsace, 15 rue Jean Starcky, BP 2488 68057, Mulhouse cedex, France.
authors.forename: Luc
authors.initials: L
authors.lastname: Delmotte
authors.affiliation: LERMAB, Université de Lorraine, BP239 54506, Vandoeuvre lès Nancy cedex, France.
authors.forename: Nicolas
authors.initials: N
authors.lastname: Brosse
authors.affiliation: Faculty of Engineering, The University of Nottingham, Energy Technologies Building, Nottingham, NG2 2 TU, United Kingdom.
authors.forename: Colin
authors.initials: C
authors.lastname: Snape
authors.affiliation: ICPM, LCPA2MC, Université de Lorraine, Metz, France.
authors.forename: Patrick
authors.initials: P
authors.lastname: Chaimbault
authors.affiliation: Reactions and processes Engineering laboratory, CNRS, Université de Lorraine, ENSIC, 1 rue Grandville, B.P.20451 54000, Nancy Cedex, France. anthony.dufour@univ-lorraine.fr.
authors.forename: Anthony
authors.initials: A
authors.lastname: Dufour
mesh_terms: D028202:Abies; D018533:Biomass; D002152:Calorimetry, Differential Scanning; D002482:Cellulose / Q000737:chemistry; D002850:Chromatography, Gel; D006358:Hot Temperature; D013058:Mass Spectrometry; D006109:Poaceae; D011188:Potassium / Q000737:chemistry*; D066244:Proton Magnetic Resonance Spectroscopy; D029963:Quercus; D013818:Thermogravimetry
chemical_list: D002482:Cellulose; D011188:Potassium
keywords: biomass; in situ analysis; nmr spectroscopy; potassium; reaction mechanisms