Solid/liquid- and vapor-phase interactions between cellulose- and lignin-derived pyrolysis products |
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| Institution: | 1. Nanchang University, Engineering Research Center for Biomass Conversion, Ministry of Education, Nanchang 330047, China;2. Nanchang University, State Key Laboratory of Food Science and Technology, Nanchang 330047, China;3. Center for Biorefining and Department of Bioproducts and Biosystems Engineering University of Minnesota, 1390 Eckles Ave., St. Paul MN 55108, USA;1. Fuels and Energy Technology Institute, Curtin University of Technology, GPO Box U1987, Perth, WA 6845, Australia;2. State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China;1. Department of Chemical Engineering, Faculty of Engineering, Mahidol University, Nakhon Pathom, 73170, Thailand;2. Center of Excellence in Particle and Material Processing Technology, Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok, 10330, Thailand;3. Program of Green Materials and Precision Devices, National Taiwan University, No.1, Sec. 4, Roosevelt Road, Taipei, 10617, Taiwan;4. Department of Chemical Engineering, National Taiwan University, No.1, Sec. 4, Roosevelt Road, Taipei, 10617, Taiwan;5. Department of Chemical and Environmental Engineering, University of Nottingham Malaysia, B34, Semenyih, Selangor, 43500, Malaysia;6. Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, Ookayama, Mekuro-ku, Tokyo, 152-8552, Japan;7. Academy of Science, The Royal Society of Thailand, Sanam Sua Pa, Dusit District, Bangkok, 10300, Thailand;1. State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;2. Department of New Energy Science and Engineering, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China |
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| Abstract: | Solid/liquid- and vapor-phase interactions between cellulose- and lignin (Japanese cedar milled wood lignin)-derived pyrolysis products were studied under the conditions of N2/600 °C/40–80 s. A dual-space closed ampoule reactor was used to eliminate the solid/liquid-phase interactions, and careful comparison of the resulting data with those of the pyrolysis of the mixed samples gave some insights into the solid/liquid- and vapor-phase interactions separately. With the solid/liquid-phase interactions, the tar yields from both cellulose and lignin increased with the decreasing yields of the char fractions in a short pyrolysis time of 40 s (primary pyrolysis stage). Most of the identified tar components from cellulose and lignin increased in their yields. The vapor-phase interactions were significant at a longer pyrolysis time of 80 s (secondary reaction stage) when the methoxyl groups of the lignin-derived volatiles were cleaved homolytically. The vapor-phase interactions accelerated the gas formation from the cellulose-derived volatiles with suppressing the vapor-phase char formation of the lignin-derived volatiles. The yields of methane and catechols from lignin also increased greatly instead of the formation of o-cresols. Most of these influences are explained with a proposed interaction mechanism, in which the cellulose-derived volatiles act as H-donors while the lignin-derived volatiles (radicals) act as H-acceptors. |
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