title: Fast pyrolysis of potassium impregnated poplar wood and characterization of its influence on the formation as well as properties of pyrolytic products.
abstract: TGA results indicated that the maximum decomposition temperature of the biomass decreased from 373.9 to 359.0°C with increasing potassium concentration. For fast pyrolysis, char yield of potassium impregnated biomass doubled regardless of pyrolysis temperature compared to demineralized one. The presence of potassium also affected bio-oil properties. Water content increased from 14.4 to 19.7 wt% and viscosity decreased from 34 to 16.2 cSt, but the pH value of the bio-oil remained stable. Gas chromatography/mass spectroscopy (GC/MS) analysis revealed that potassium promoted thermochemical reactions, thus causing a decrease of levoglucosan and an increase of small molecules and lignin-derived phenols in bio-oil. Additionally, various forms of aromatic hydrocarbons, probably derived from lignins, were detected in non-condensed pyrolytic gas fractions.
authors.affiliation: Department of Forest Sciences and Research Institute for Agriculture and Life Science, Seoul National University, 599 Gwanak-ro, Gwanak-gu, Seoul 151-921, Republic of Korea.
authors.forename: Hyewon
authors.initials: H
authors.lastname: Hwang
authors.forename: Shinyoung
authors.initials: S
authors.lastname: Oh
authors.forename: Tae-Su
authors.initials: TS
authors.lastname: Cho
authors.forename: In-Gyu
authors.initials: IG
authors.lastname: Choi
authors.forename: Joon Weon
authors.initials: JW
authors.lastname: Choi
mesh_terms: D056804:Biofuels / Q000032:analysis; D018533:Biomass; D001709:Biotechnology / Q000379:methods*; D002606:Charcoal / Q000737:chemistry; D006358:Hot Temperature; D008031:Lignin / Q000032:analysis; D008670:Metals / Q000032:analysis; D032107:Populus / Q000187:drug effects*; D011188:Potassium / Q000494:pharmacology*; D013818:Thermogravimetry; D014934:Wood / Q000187:drug effects*
chemical_list: D056804:Biofuels; D008670:Metals; C540010:biochar; D002606:Charcoal; D008031:Lignin; D011188:Potassium
keywords: Bio-oil; Char formation; Fast pyrolysis; Inorganic distribution; Potassium