Study on the gas evolution and char structural change during pyrolysis of cotton stalk |
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| Institution: | 1. State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China;2. School of Agricultural and Food Engineering, Shandong University of Technology, Zibo 255049, China;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 Mechanical Engineering, University of Zaragoza, Mariano Esquillor 15, E-50018 Zaragoza, Spain;3. China-EU Institute for Clean and Renewable Energy, Huazhong University of Science and Technology, Wuhan 430074, China;1. State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;2. China-EU Institute for Clean and Renewable Energy at Huazhong University of Science and Technology, Wuhan 430074, China;3. Department of New Energy Science and Engineering, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;1. Academy of Scientific & Innovative Research (AcSIR), CSIR-Indian Institute of Petroleum (CSIR-IIP) Campus, Dehradun, India;2. Waste Plastics Conversion-Process Technology Area, Upstream & Wax Rheology Division, CSIR- Indian Institute of Petroleum, Haridwar Road, Dehradun 248005, India;1. Processes, Materials and Solar Energy Laboratory, PROMES-CNRS, 7 rue du Four Solaire, 66120 Font Romeu, France;2. Université de Toulouse, Mines Albi, UMR CNRS 5302, Centre RAPSODEE, Campus Jarlard, F-81013 Albi Cedex 09, France;1. College of Food Science and Engineering, Northwest A&F University, Yangling 712100, Shaanxi, China;2. Institute of Cotton Research of Chinese Academy of Agricultural Sciences, State Key Laboratory of Cotton Biology, Anyang 455000, Henan, China;1. School of Energy Science and Engineering, Nanjing Tech University, Nanjing 211816, China;2. School of Mechanical and Power Engineering, Nanjing Tech University, Nanjing 211816, China |
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| Abstract: | The gas release properties and char structural evolution during the pyrolysis of cotton stalk were investigated. The evolution characteristics of volatile products were examined by pyrolysis–Fourier transform infrared spectroscopy (FTIR)/thermal conductivity detection (TCD) analysis (Py–FTIR/TCD). The char chemical structure and physical characteristics were investigated by means of FTIR and N2 physisorption techniques. Evolution characteristics of the main volatile products were given. The evolution of CO2 was approximately 26 °C earlier than that of CO. CH4 evolution covered over a wider temperature range of 300–600 °C, with a maximum at 394 °C. The amount of hydroxyl, aliphatic C H and olefinic C C bonds in the char decreased significantly above 250 °C. The aromatization process started at ≈350 °C and continued to higher temperatures, leaving the char enriched with condensed aromatic ring systems. The BET surface area increased continually with increasing temperature to reach a maximum value of 4.68 m2/g at 500 °C and decreased at higher temperatures. The micropore volume showed a similar behavior to the surface area, while the mesopore volume and total pore volume always increased. |
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