Nickel oxide based catalysts for the simultaneous reactions of methanation and desulfurization

Malaysian crude natural gas is categorized as a sour gas due to the contamination of carbon dioxide (CO2) and hydrogen sulfide (H2S). Recently, the removal of these sour gases via chemical conversion technique becomes the most promising technique. The objective of this novel catalyst development is...

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Main Author:	Ching, Kuan Yong
Format:	Thesis
Language:	English
Published:	2008
Subjects:	TP Chemical technology
Online Access:	http://eprints.utm.my/id/eprint/18070/1/ChingKuanYongMFS2008.pdf
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spelling	my-utm-ep.180702018-06-29T21:51:20Z Nickel oxide based catalysts for the simultaneous reactions of methanation and desulfurization 2008-11 Ching, Kuan Yong TP Chemical technology Malaysian crude natural gas is categorized as a sour gas due to the contamination of carbon dioxide (CO2) and hydrogen sulfide (H2S). Recently, the removal of these sour gases via chemical conversion technique becomes the most promising technique. The objective of this novel catalyst development is to achieve both low temperature and high conversion of sour gases to be applicable in gas industry. The advantage of catalytic technology is the utilization of CO2 present in the production of methane gas. Supported mixed metal oxide catalysts were prepared by wetness impregnation method for the in-situ reactions of H2S desulfurization and CO2 methanation from ambient temperature up to 300oC. Fe/ Co/ Ni (10: 30: 60)-Al2O3 and Pr/ Co/ Ni (5: 35: 60)-Al2O3 catalysts were revealed as the most potential resulted from the catalytic activity screening by Fourier Transform Infrared Spectroscopy (FTIR) and Gas Chromatography (GC). Results showed that the conversion of H2S to elemental sulfur over the catalysts was achieved 100% even around 250oC. Methanation of CO2 in the presence of H2S yielded 2.9% of CH4 over Fe/ Co/ Ni (10: 30: 60)-Al2O3 catalyst and 6.1% of CH4 over Pr/ Co/ Ni (5: 35: 60)- Al2O3 catalyst at maximum studied temperature of 300oC. X-ray Photoelectron Spectroscopy (XPS) revealed Ni2O3 and Fe3O4 as the surface active components on the Fe/ Co/ Ni (10: 30: 60)-Al2O3 catalyst, while Ni2O3 and Co3O4 on the Pr/ Co/ Ni (5: 35: 60)-Al2O3 catalyst. X-ray Diffraction (XRD) and Field Emission Scanning Electron Microscope (FESEM) showed that the supported catalysts are amorphous in structure. Results from Energy Dispersive X-ray Analysis (EDX) indicated the presence of 2.7% and 0.9% of sulfur on the spent Fe/ Co/ Ni (10: 30: 60)-Al2O3 and Pr/ Co/ Ni (5: 35: 60)-Al2O3 catalysts, respectively. There was 5.5% reduction of surface area over the spent Fe/ Co/ Ni (10: 30: 60)-Al2O3 catalyst characterized by Nitrogen Adsorption analysis. Meanwhile, there was 8.6% increment of surface area over the spent Pr/ Co/ Ni (5: 35: 60)-Al2O3 catalyst, which would explain the dramatic increased of catalytic performance over this catalyst at maximum studied temperature of 300oC. Characterization by FTIR and Thermogravimetry Analysis- Differential Thermal Analysis (TGA-DTA) revealed the existence of residue of nitrate and surface hydroxyl compounds on the catalysts. The aim to obtain high H2S desulfurization rate at low temperature was achieved. However, improvement is still needed for the CO2 methanation reaction at low temperature in the presence of H2S 2008-11 Thesis http://eprints.utm.my/id/eprint/18070/ http://eprints.utm.my/id/eprint/18070/1/ChingKuanYongMFS2008.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:85242?queryType=vitalDismax&query=Nickel+oxide+based+catalysts+for+the+simultaneous+reactions+of+methanation+and+desulfurization&public=true masters Universiti Teknologi Malaysia, Faculty of Science Faculty of Science
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	TP Chemical technology
spellingShingle	TP Chemical technology Ching, Kuan Yong Nickel oxide based catalysts for the simultaneous reactions of methanation and desulfurization
description	Malaysian crude natural gas is categorized as a sour gas due to the contamination of carbon dioxide (CO2) and hydrogen sulfide (H2S). Recently, the removal of these sour gases via chemical conversion technique becomes the most promising technique. The objective of this novel catalyst development is to achieve both low temperature and high conversion of sour gases to be applicable in gas industry. The advantage of catalytic technology is the utilization of CO2 present in the production of methane gas. Supported mixed metal oxide catalysts were prepared by wetness impregnation method for the in-situ reactions of H2S desulfurization and CO2 methanation from ambient temperature up to 300oC. Fe/ Co/ Ni (10: 30: 60)-Al2O3 and Pr/ Co/ Ni (5: 35: 60)-Al2O3 catalysts were revealed as the most potential resulted from the catalytic activity screening by Fourier Transform Infrared Spectroscopy (FTIR) and Gas Chromatography (GC). Results showed that the conversion of H2S to elemental sulfur over the catalysts was achieved 100% even around 250oC. Methanation of CO2 in the presence of H2S yielded 2.9% of CH4 over Fe/ Co/ Ni (10: 30: 60)-Al2O3 catalyst and 6.1% of CH4 over Pr/ Co/ Ni (5: 35: 60)- Al2O3 catalyst at maximum studied temperature of 300oC. X-ray Photoelectron Spectroscopy (XPS) revealed Ni2O3 and Fe3O4 as the surface active components on the Fe/ Co/ Ni (10: 30: 60)-Al2O3 catalyst, while Ni2O3 and Co3O4 on the Pr/ Co/ Ni (5: 35: 60)-Al2O3 catalyst. X-ray Diffraction (XRD) and Field Emission Scanning Electron Microscope (FESEM) showed that the supported catalysts are amorphous in structure. Results from Energy Dispersive X-ray Analysis (EDX) indicated the presence of 2.7% and 0.9% of sulfur on the spent Fe/ Co/ Ni (10: 30: 60)-Al2O3 and Pr/ Co/ Ni (5: 35: 60)-Al2O3 catalysts, respectively. There was 5.5% reduction of surface area over the spent Fe/ Co/ Ni (10: 30: 60)-Al2O3 catalyst characterized by Nitrogen Adsorption analysis. Meanwhile, there was 8.6% increment of surface area over the spent Pr/ Co/ Ni (5: 35: 60)-Al2O3 catalyst, which would explain the dramatic increased of catalytic performance over this catalyst at maximum studied temperature of 300oC. Characterization by FTIR and Thermogravimetry Analysis- Differential Thermal Analysis (TGA-DTA) revealed the existence of residue of nitrate and surface hydroxyl compounds on the catalysts. The aim to obtain high H2S desulfurization rate at low temperature was achieved. However, improvement is still needed for the CO2 methanation reaction at low temperature in the presence of H2S
format	Thesis
qualification_level	Master's degree
author	Ching, Kuan Yong
author_facet	Ching, Kuan Yong
author_sort	Ching, Kuan Yong
title	Nickel oxide based catalysts for the simultaneous reactions of methanation and desulfurization
title_short	Nickel oxide based catalysts for the simultaneous reactions of methanation and desulfurization
title_full	Nickel oxide based catalysts for the simultaneous reactions of methanation and desulfurization
title_fullStr	Nickel oxide based catalysts for the simultaneous reactions of methanation and desulfurization
title_full_unstemmed	Nickel oxide based catalysts for the simultaneous reactions of methanation and desulfurization
title_sort	nickel oxide based catalysts for the simultaneous reactions of methanation and desulfurization
granting_institution	Universiti Teknologi Malaysia, Faculty of Science
granting_department	Faculty of Science
publishDate	2008
url	http://eprints.utm.my/id/eprint/18070/1/ChingKuanYongMFS2008.pdf
_version_	1747815185424318464

Nickel oxide based catalysts for the simultaneous reactions of methanation and desulfurization

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