title: Catalytic conversion of lignin pyrolysis model compound- guaiacol and its kinetic model including coke formation.
abstract: Lignin is the most difficult to be converted and most easy coking component in biomass catalytic pyrolysis to high-value liquid fuels and chemicals. Catalytic conversion of guaiacol as a lignin model compound was conducted in a fixed-bed reactor over ZSM-5 to investigate its conversion and coking behaviors. The effects of temperature, weight hourly space velocity (WHSV) and partial pressure on product distribution were studied. The results show the maximum aromatic carbon yield of 28.55% was obtained at temperature of 650 °C, WHSV of 8 h-1and partial pressure of 2.38 kPa, while the coke carbon yield was 19.55%. The reaction pathway was speculated to be removing methoxy group to form phenols with further aromatization to form aromatics. The amount of coke increased with increasing reaction time. The surface area and acidity of catalysts declined as coke formed on the acid sites and blocked the pore channels, which led to the decrease of aromatic yields. Finally, a kinetic model of guaiacol catalytic conversion considering coke deposition was built based on the above reaction pathway to properly predict product distribution. The experimental and model predicting data agreed well. The correlation coefficient of all equations were all higher than 0.90.
authors.affiliation: Ministry of Education of Key Laboratory of Energy Thermal Conversion and Control, School of Energy and Environment, Southeast University, Nanjing 210096, P.R. China.
authors.forename: Huiyan
authors.initials: H
authors.lastname: Zhang
authors.affiliation: Ministry of Education of Key Laboratory of Energy Thermal Conversion and Control, School of Energy and Environment, Southeast University, Nanjing 210096, P.R. China.
authors.forename: Yun
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Ministry of Education of Key Laboratory of Energy Thermal Conversion and Control, School of Energy and Environment, Southeast University, Nanjing 210096, P.R. China.
authors.forename: Shanshan
authors.initials: S
authors.lastname: Shao
authors.affiliation: Ministry of Education of Key Laboratory of Energy Thermal Conversion and Control, School of Energy and Environment, Southeast University, Nanjing 210096, P.R. China.
authors.forename: Rui
authors.initials: R
authors.lastname: Xiao
mesh_terms: D018533:Biomass; D002244:Carbon / Q000032:analysis; D002384:Catalysis; D003077:Coke / Q000032:analysis*; D006139:Guaiacol / Q000737:chemistry*; D006358:Hot Temperature; D007700:Kinetics; D008031:Lignin / Q000737:chemistry*; D008962:Models, Theoretical; D013818:Thermogravimetry; D013997:Time Factors; D014961:X-Ray Diffraction
chemical_list: D003077:Coke; D006139:Guaiacol; D002244:Carbon; D008031:Lignin