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Zhao H.,Shandong University of Science and Technology | Zhao H.,Shandong Provincial Key Laboratory of Low carbon Energy Chemical Engineering | Yan H.,Shandong University of Science and Technology | Yan H.,Shandong Provincial Key Laboratory of Low carbon Energy Chemical Engineering | And 17 more authors.
Journal of Thermal Analysis and Calorimetry | Year: 2013

Macrocystis pyrifera is one important marine macro-algae, while its residues produced by industrial alginate extraction is a hot potato. To figure out whether its residue is suitable for pyrolysis for biofuel, the pyrolytic characteristics and kinetics of macro-algae M. pyrifera residue was investigated using thermogravimetric method from 50 to 800 C in an inert argon atmosphere at different heating rates of 5, 10, 20, and 30 C min-1. The activation energy and pre-exponential factor was calculated by Flynn-Wall-Ozawa, Kissinger-Akahira-Sunose, and Popescu methods, and the kinetic mechanism was deduced by Popescu method. The results showed that the primary devolatilization stage of M. pyrifera residue can be described by Jander function ([1 - (1 - α)1/3]2). The average activation energy of M. pyrifera residue was 222.4 kJ mol-1. The results suggested that the experimental results and kinetic parameters provided useful information for the design of pyrolytic processing system using M. pyrifera residue as feedstock. © 2011 Akadémiai Kiadó, Budapest, Hungary. Source


Zhao H.,Shandong University of Science and Technology | Zhao H.,CAS Qingdao Institute of Oceanology | Zhao H.,University of Chinese Academy of Sciences | Zhao H.,Shandong Provincial Key Laboratory of Low carbon Energy Chemical Engineering | And 10 more authors.
Evidence-based Complementary and Alternative Medicine | Year: 2011

The pyrolytic kinetics of Phragmites australis was investigated using thermogravimetric analysis (TGA) method with linear temperature programming process under an inert atmosphere. Kinetic expressions for the degradation rate in devolatilization and combustion steps have been obtained for P. australis with Dollimore method. The values of apparent activation energy, the most probable mechanism functions, and the corresponding preexponential factor were determined. The results show that the model agrees well with the experimental data and provide useful information for the design of pyrolytic processing system using P. australis as feedstock to produce biofuel. Copyright © 2011 Hui Zhao et al. Source

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