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Title: Pyrolysis of walnut shell residues in a fixed bed reactor: Effects of process parameters, chemical and functional properties of bio-oil
Authors: Shah M.A.
Khan N.S.
Kumar, Vimal
Qurashi A.
Published in: Journal of Environmental Chemical Engineering
Abstract: In the present work the products and characteristics of bio-yields obtained from pyrolysis of different types of walnut shells (WS) by using a fixed bed pyrolyzer. The different walnut shells considered are paper (PSW), thin (TSW), medium (MSW) and hard (HSW) shelled walnut. The biomass samples were pyrolyzed at various temperatures, particle sizes, heating and sweep gas flow rates. The results revealed that the maximum bio-oil 44.7, biochar 37.6 and gas 40.4 wt% yields have been obtained for HSW, MSW and HSW at a pyrolysis temperature of 550, 375 and 750 0C respectively at heating rate 0.33 K/sec, particle size 0.5-1.5 mm with swept gas flow rate 1.6 × 10-6 m3/s. The higher heating value (HHV) of bio-oil obtained from different walnut shells are ranged from 26 to 27.3 MJ/kg. Comprehensive physiochemical characteristics such as density, viscosity, flash point, pour point and water content of bio-oils have been obtained. Chemical composition analysis of bio-oils revealed that the pyrolytic bio-oil composition is predominated by oxygenated compounds such as carbonyl, methoxy, phenols and carboxyl groups determined by GC-MS, FTIR, 1H NMR and 13C NMR. The pyrolysis gas mainly contained CH4 CO, H2, CO2, and light hydrocarbons. Based on these results and structural analysis of the bio-oil, it can be concluded that the bio-oil obtained from WS may be used as a feedstock for furnaces, as a fuel, as a lubricant after modifications and value-added products via pyrolysis. © 2021 Elsevier Ltd.
Citation: Journal of Environmental Chemical Engineering, 9(4)
Issue Date: 2021
Publisher: Elsevier Ltd
Keywords: Bio-oil
Fixed bed reactor
Pyrolysis products
ISSN: 22133437
Author Scopus IDs: 57203128051
Author Affiliations: Shah, M.A., Department of Chemical Engineering, Kombolchia Institute of Technology, Kombolchia, Ethiopia
Khan, N.S., Department of Chemical Engineering, National Institute of Technology, Srinagar J and K, 190006, India
Kumar, V., Department of Chemical Engineering, Indian Institute of Technology, Roorkee Uttarakhand, 247667, India
Qurashi, A., Department of Chemistry, Khalifa University, Abu Dhabi, 127788, United Arab Emirates
Funding Details: The authors would like to acknowledge to Dr. Desavath V. Naik and Mr. Rakesh Singh CSIR-IIP for his unconditional support in the continuous operation of the biomass pyrolysis unit. We greatly appreciate the financial support provided by Minister of Human Resources Department (MHRD), Govt. of India. The authors also thankful to the Department of Chemical Engineering, Indian Institute of Technology Roorkee and Department of Chemical Engineering, National Institute of Technology Srinagar, Jammu & Kashmir.
Corresponding Author: Qurashi, A.; Department of Chemistry, United Arab Emirates; email:
Appears in Collections:Journal Publications [CH]

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