title: Catalytic fast pyrolysis of lignin over mesoporous Y zeolite using Py-GC/MS.
abstract: The catalytic pyrolysis of lignin was carried out at 500 degrees C using pyrolysis gas chromatography/mass spectrometry. In-situ vapor cracking method, in which the vapor-phase products from the noncatalytic pyrolysis step were catalytically upgraded in the second step, was used. Mesoporous Y zeolite, which was synthesized from commercial zeolite Y (CBV720) using the pseudomorphic synthesis method, was used for the catalytic pyrolysis of lignin for the first time. Further, a representative mesoporous material, Al-MCM-41, was applied for the catalytic pyrolysis of lignin. The main products of the non-catalytic pyrolysis of lignin were phenolic compounds because lignin mainly comprises phenylpropane units. Catalytic upgrading of the non-catalytic pyrolysis products resulted in increased yields of low-molecular-mass phenolics, mono aromatics, and poly aromatic hydrocarbons (PAHs). The production of mono aromatics and PAHs was enhanced remarkably when the more acidic mesoporous Y zeolite was used. Conversely, the yield-of alkoxy phenolics was higher when the less acidic Al-MCM-41 was used. With increasing mesoporous Y/lignin ratio, the yield of total phenolics decreased and that of light phenolics increased. The yields of mono aromatics and PAHs increased sharply with increasing mesoporous Y/lignin ratio.
authors.affiliation: Graduate School of Energy and Environmental System Engineering, University of Seoul, Seoul 130-743, Korea.
authors.forename: Hyung Won
authors.initials: HW
authors.lastname: Lee
authors.forename: Tae Hwan
authors.initials: TH
authors.lastname: Kim
authors.forename: Sung Hoon
authors.initials: SH
authors.lastname: Park
authors.forename: Jong-Ki
authors.initials: JK
authors.lastname: Jeon
authors.forename: Dong Jin
authors.initials: DJ
authors.lastname: Suh
authors.forename: Young-Kwon
authors.initials: YK
authors.lastname: Park