Metal oxide modified limestone catalysts for gasification of rice straw in hydrogen production

Hydrogen has great potential for energy and environmental sustainability. Hydrogen is considered as a secondary source of energy, commonly referred to as an energy carrier which is used to store and transport energy in a form that can be easily used. Hydrogen does not exist freely in nature, it o...

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Main Author:	Mohamad @ Mahmud, Surahim
Format:	Thesis
Language:	English
Published:	2016
Subjects:	Hydrogen as fuel Hydrogen Metallic oxides
Online Access:	http://psasir.upm.edu.my/id/eprint/69195/1/FS%202016%2055%20IR.pdf
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id	my-upm-ir.69195
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spelling	my-upm-ir.691952019-06-27T03:41:27Z Metal oxide modified limestone catalysts for gasification of rice straw in hydrogen production 2016-05 Mohamad @ Mahmud, Surahim Hydrogen has great potential for energy and environmental sustainability. Hydrogen is considered as a secondary source of energy, commonly referred to as an energy carrier which is used to store and transport energy in a form that can be easily used. Hydrogen does not exist freely in nature, it only produced from other sources. The potential of utilization of biomass as renewable and sustainable energy resources have attracted researchers to produce hydrogen from cheap and highly available resources such as lignocellulosic biomass waste. Biomass gasification of rice straw using modified natural limestone based catalysts has been studied to promote the production of hydrogen. This study is aimed to develop natural calcined limestone (CL) based catalysts with high activity and selectivity. Modification with addition of mono and bimetallic metal dopants (Ni, Fe, Co, NiCo, NiFe and CoFe) on CL were performed for gasification of rice straw biomass for hydrogen conversion. The catalysts were synthesized through wet impregnation method and characterized by using X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) surface area, Thermogravimetry analysis (TGA), Field emission scanning electron microscopy - Energy dispersive Xray (FESEM-EDX) and Temperature programmed desorption of carbon dioxide (TPDCO2) to determine the structure, physical and chemical properties of the catalysts. Temperature programmed gasification (TPG) was conducted to investigate the gasification reaction of rice straw and the product gases were analysed using online mass spectrometer. The gasification process was carried out in partial oxygen (5% O2/Helium) environment heating from 50 to 900 °C with mass ratio of biomass to catalyst of 2:1. The results revealed that the addition of metal dopants on CL significantly improves the activity and selectivity towards hydrogen production. For monometallic doped catalysts, Ni-CL was found to give the highest H2 conversion followed by Co-CL and Fe-CL. Moreover, The CL had shown to act both as catalyst and CO2 sorbent thus enhanced the production of hydrogen. The additions of bimetallic dopant have shown a further increment of hydrogen yield. The NiCo-CL catalyst exhibit highest hydrogen selectivity compared to other catalysts due to improvement in catalytic activity that enhanced gasification of rice straw and promoted hydrogen favoured reactions. Hydrogen as fuel Hydrogen Metallic oxides 2016-05 Thesis http://psasir.upm.edu.my/id/eprint/69195/ http://psasir.upm.edu.my/id/eprint/69195/1/FS%202016%2055%20IR.pdf text en public masters Universiti Putra Malaysia Hydrogen as fuel Hydrogen Metallic oxides
institution	Universiti Putra Malaysia
collection	PSAS Institutional Repository
language	English
topic	Hydrogen as fuel Hydrogen Metallic oxides
spellingShingle	Hydrogen as fuel Hydrogen Metallic oxides Mohamad @ Mahmud, Surahim Metal oxide modified limestone catalysts for gasification of rice straw in hydrogen production
description	Hydrogen has great potential for energy and environmental sustainability. Hydrogen is considered as a secondary source of energy, commonly referred to as an energy carrier which is used to store and transport energy in a form that can be easily used. Hydrogen does not exist freely in nature, it only produced from other sources. The potential of utilization of biomass as renewable and sustainable energy resources have attracted researchers to produce hydrogen from cheap and highly available resources such as lignocellulosic biomass waste. Biomass gasification of rice straw using modified natural limestone based catalysts has been studied to promote the production of hydrogen. This study is aimed to develop natural calcined limestone (CL) based catalysts with high activity and selectivity. Modification with addition of mono and bimetallic metal dopants (Ni, Fe, Co, NiCo, NiFe and CoFe) on CL were performed for gasification of rice straw biomass for hydrogen conversion. The catalysts were synthesized through wet impregnation method and characterized by using X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) surface area, Thermogravimetry analysis (TGA), Field emission scanning electron microscopy - Energy dispersive Xray (FESEM-EDX) and Temperature programmed desorption of carbon dioxide (TPDCO2) to determine the structure, physical and chemical properties of the catalysts. Temperature programmed gasification (TPG) was conducted to investigate the gasification reaction of rice straw and the product gases were analysed using online mass spectrometer. The gasification process was carried out in partial oxygen (5% O2/Helium) environment heating from 50 to 900 °C with mass ratio of biomass to catalyst of 2:1. The results revealed that the addition of metal dopants on CL significantly improves the activity and selectivity towards hydrogen production. For monometallic doped catalysts, Ni-CL was found to give the highest H2 conversion followed by Co-CL and Fe-CL. Moreover, The CL had shown to act both as catalyst and CO2 sorbent thus enhanced the production of hydrogen. The additions of bimetallic dopant have shown a further increment of hydrogen yield. The NiCo-CL catalyst exhibit highest hydrogen selectivity compared to other catalysts due to improvement in catalytic activity that enhanced gasification of rice straw and promoted hydrogen favoured reactions.
format	Thesis
qualification_level	Master's degree
author	Mohamad @ Mahmud, Surahim
author_facet	Mohamad @ Mahmud, Surahim
author_sort	Mohamad @ Mahmud, Surahim
title	Metal oxide modified limestone catalysts for gasification of rice straw in hydrogen production
title_short	Metal oxide modified limestone catalysts for gasification of rice straw in hydrogen production
title_full	Metal oxide modified limestone catalysts for gasification of rice straw in hydrogen production
title_fullStr	Metal oxide modified limestone catalysts for gasification of rice straw in hydrogen production
title_full_unstemmed	Metal oxide modified limestone catalysts for gasification of rice straw in hydrogen production
title_sort	metal oxide modified limestone catalysts for gasification of rice straw in hydrogen production
granting_institution	Universiti Putra Malaysia
publishDate	2016
url	http://psasir.upm.edu.my/id/eprint/69195/1/FS%202016%2055%20IR.pdf
_version_	1747812670736695296

Metal oxide modified limestone catalysts for gasification of rice straw in hydrogen production

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