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Pyrolysis kinetic analysis of poly(methyl methacrylate) using evolved gas analysis-mass spectrometry
한태욱,김용민,Atsushi Watanabe,Norio Teramae,박영권,김승도 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.4
The results of evolved gas analysis-mass spectrometry (EGA-MS) analysis were used for the kinetic analysis of poly-methyl methacrylate (PMMA) pyrolysis for the first time. Various kinetic methods, such as model-free, integral master-plots, and model-fitting methods, have been applied to derive the kinetic parameters (activation energy, pre-exponential factor and reaction model). The PMMA pyrolysis reaction mechanism was suggested to occur via a single step unzipping reaction producing methyl methacrylate (MMA) as the main pyrolyzate from the kinetic analysis results and mass spectrum obtained from the EGA-MS measurements. The kinetic parameters derived from modelfree method combined with the integral master-plots method were comparable to those obtained from the peak property method (PPM). The theoretical curve derived from the kinetic results by the PPM was also well matched with the experimental thermal conversion curve using the EGA-MS measurements.
Analytical pyrolysis properties of waste medium-density fiberboard and particle board
한태욱,김승도,김영민,Chuichi Watanabe,Norio Teramae,박영권,이윤희 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.32 No.-
Medium-density fiberboard (MDF) and particle board (PB) showed similar pyrolysis characteristics. Thermogravimetric analysis displayed the main weight loss between 200 and 400 8C, continued up to600 8C. The activation energy (Ea) values at each conversion were in the range of 166–372 kJ/mol for MDFand 161–325 kJ/mol for PB and indicated independent reactions of hemicellulose, cellulose, lignin andchar stabilization. Isothermal pyrolysis produced hemicellulose pyrolyzates at 300 8C. The mainproducts at 400 8C had similar distribution between MDF and PB. At 600 8C, gas products were increaseddue to the secondary cracking of pyrolyzates.
Non-isothermal pyrolysis properties of <i>Laminaria japonica</i>
Han, Tae Uk,Kim, Young-Min,Siddiqui, Muhammad Zain,Lee, Taeho,Watanabe, Atsushi,Teramae, Norio,Kim, Seungdo,Park, Young-Kwon Elsevier 2018 JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS Vol.130 No.-
<P><B>Abstract</B></P> <P>The pyrolysis of <I>Laminaria</I> (<I>L.</I>) <I>japonica</I> was examined using non-isothermal analytical pyrolysis techniques, such as thermogravimetric (TG) and multi-shot pyrolyzer (Py)-gas chromatography/mass spectrometry (GC/MS) analysis. TG, derivative TG curves, and the apparent activation energy suggested that the decomposition of <I>L. japonica</I> has three thermal decomposition stages. The average mass spectra and multi-shot Py-GC/MS chromatograms obtained at each thermal decomposition stage confirmed the main decomposition reaction at each thermal zone. At the first stage, the decomposition of lipids and carbohydrates was initiated. The main decomposition of carbohydrates occurred at the second stage. At the final stage, proteins were decomposed and char intermediates were stabilized by supplying a higher temperature. A low activation energy at the second stage and the presence of metals in <I>L. japonica</I> suggests that during the non-isothermal pyrolysis of <I>L. japonica</I>, the catalytic effect is enhanced and involves the decomposition of carbohydrates.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Pyrolysis reaction pathway of <I>L. Japonica</I> was investigated using TGA and Py-GC/MS. </LI> <LI> Pyrolysis of <I>L. Japonica</I> was accounted for three independent decomposition reactions of biomass components. </LI> <LI> Low activation energy was achieved on the pyrolysis of <I>L. japonica</I> by the presence of inorganics. </LI> </UL> </P>