Syngas production from biomass in chemical looping using metal ferrites as oxygen carrying materials

Chemical looping gasification (CLG) is a promising technology that can possibly be used as a replacement to produce hydrogen as a source of renewable energy for the future. Through transferring oxygen by oxygen carriers, N2-free syngas can be produced without the use of air separation unit. Oxygen c...

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Main Author: Tey, Phoebe Min Ying
Other Authors: Grzegorz Lisak
Format: Final Year Project
Language:English
Published: Nanyang Technological University 2023
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Online Access:https://hdl.handle.net/10356/166717
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Institution: Nanyang Technological University
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spelling sg-ntu-dr.10356-1667172023-05-19T15:34:30Z Syngas production from biomass in chemical looping using metal ferrites as oxygen carrying materials Tey, Phoebe Min Ying Grzegorz Lisak School of Civil and Environmental Engineering Nanyang Environment and Water Research Institute g.lisak@ntu.edu.sg Engineering::Environmental engineering Chemical looping gasification (CLG) is a promising technology that can possibly be used as a replacement to produce hydrogen as a source of renewable energy for the future. Through transferring oxygen by oxygen carriers, N2-free syngas can be produced without the use of air separation unit. Oxygen carriers play an important role in CLG as they can determine the reactivity and stability of the reactions. Iron oxides are promising oxygen carriers due to their low economic cost and environmental impacts. The use of alkaline earth metal (Mg, Ca, Sr and Ba) ferrites have also been proven to improve the syngas production during CLG. Therefore, this study aims to utilise four metal ferrites, MgFe2O4, CaFe2O4, SrFe2O4 and BaFe2O4, with wood as biomass fuel, to compare their effects as viable oxygen carriers during the CLG process. Their reactivity, stability and resistance to agglomeration will be studied over 20 cycles of CLG using a fixed bed reactor. To further study these effects, thermogravimetric analysis (TGA) was conducted for the selected four oxygen carriers before and after 20 cycles of CLG. X-ray powder diffraction (XRD) and scanning electron microscopy (SEM) were used to monitor the physical characteristics and surface morphology of the selected four oxygen carriers before and after 20 cycles of CLG. This was to analyse their resistance to agglomeration. The results suggests that BaFe2O4 as the oxygen carrier had the best performance as it had the highest reactivity to carbon, highest stability in the fixed bed reactor (highest gas yield, carbon conversion, syngas selectivity and H2/CO ratio) and highest resistance to agglomeration as there were still gaps/spaces observed after 20 cycles of CLG. Bachelor of Engineering (Environmental Engineering) 2023-05-18T11:50:01Z 2023-05-18T11:50:01Z 2023 Final Year Project (FYP) Tey, P. M. Y. (2023). Syngas production from biomass in chemical looping using metal ferrites as oxygen carrying materials. Final Year Project (FYP), Nanyang Technological University, Singapore. https://hdl.handle.net/10356/166717 https://hdl.handle.net/10356/166717 en application/pdf Nanyang Technological University
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering::Environmental engineering
spellingShingle Engineering::Environmental engineering
Tey, Phoebe Min Ying
Syngas production from biomass in chemical looping using metal ferrites as oxygen carrying materials
description Chemical looping gasification (CLG) is a promising technology that can possibly be used as a replacement to produce hydrogen as a source of renewable energy for the future. Through transferring oxygen by oxygen carriers, N2-free syngas can be produced without the use of air separation unit. Oxygen carriers play an important role in CLG as they can determine the reactivity and stability of the reactions. Iron oxides are promising oxygen carriers due to their low economic cost and environmental impacts. The use of alkaline earth metal (Mg, Ca, Sr and Ba) ferrites have also been proven to improve the syngas production during CLG. Therefore, this study aims to utilise four metal ferrites, MgFe2O4, CaFe2O4, SrFe2O4 and BaFe2O4, with wood as biomass fuel, to compare their effects as viable oxygen carriers during the CLG process. Their reactivity, stability and resistance to agglomeration will be studied over 20 cycles of CLG using a fixed bed reactor. To further study these effects, thermogravimetric analysis (TGA) was conducted for the selected four oxygen carriers before and after 20 cycles of CLG. X-ray powder diffraction (XRD) and scanning electron microscopy (SEM) were used to monitor the physical characteristics and surface morphology of the selected four oxygen carriers before and after 20 cycles of CLG. This was to analyse their resistance to agglomeration. The results suggests that BaFe2O4 as the oxygen carrier had the best performance as it had the highest reactivity to carbon, highest stability in the fixed bed reactor (highest gas yield, carbon conversion, syngas selectivity and H2/CO ratio) and highest resistance to agglomeration as there were still gaps/spaces observed after 20 cycles of CLG.
author2 Grzegorz Lisak
author_facet Grzegorz Lisak
Tey, Phoebe Min Ying
format Final Year Project
author Tey, Phoebe Min Ying
author_sort Tey, Phoebe Min Ying
title Syngas production from biomass in chemical looping using metal ferrites as oxygen carrying materials
title_short Syngas production from biomass in chemical looping using metal ferrites as oxygen carrying materials
title_full Syngas production from biomass in chemical looping using metal ferrites as oxygen carrying materials
title_fullStr Syngas production from biomass in chemical looping using metal ferrites as oxygen carrying materials
title_full_unstemmed Syngas production from biomass in chemical looping using metal ferrites as oxygen carrying materials
title_sort syngas production from biomass in chemical looping using metal ferrites as oxygen carrying materials
publisher Nanyang Technological University
publishDate 2023
url https://hdl.handle.net/10356/166717
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