Steam reforming of gasified biomass tar for hydrogen production over nickel–dolomite based catalyst

Catalytic steam reforming is a promising approach to address tar formation and improve hydrogen (H2) production from biomass gasification. In this research, multi-compound tar model (phenol, toluene, naphthalene, and pyrene) was steam reformed for H2 production over various types of 10 wt.% dolomite...

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Main Author:	Tan, Ru Shien
Format:	Thesis
Language:	English
Published:	2019
Subjects:	TP Chemical technology
Online Access:	http://eprints.utm.my/id/eprint/87148/1/TanRuShienMSChE2019.pdf
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spelling	my-utm-ep.871482020-11-30T08:56:52Z Steam reforming of gasified biomass tar for hydrogen production over nickel–dolomite based catalyst 2019 Tan, Ru Shien TP Chemical technology Catalytic steam reforming is a promising approach to address tar formation and improve hydrogen (H2) production from biomass gasification. In this research, multi-compound tar model (phenol, toluene, naphthalene, and pyrene) was steam reformed for H2 production over various types of 10 wt.% dolomite promoted 10 wt.% nickel based catalysts supported on alumina, lanthana, ceria, and zirconia. The research aims to synthesize nickel-dolomite catalyst for steam reforming of gasified biomass tar for optimum H2 production. The catalysts were characterized by thermogravimetric analysis, temperature programmed reduction, temperature programmed desorption, nitrogen physisorption, and X-ray diffraction. The results showed that the addition of dolomite promoter to the catalysts strengthened the metal-support interaction and basicity of the catalyst. Steam reforming for catalyst screening was carried out at 700 oC with steam to carbon (S/C) molar ratio of 1 and gas hourly space velocity (GHSV) of 20,453 mL/h·gcat. The Ni/dolomite/La2O3 (NiDLa) catalyst displayed mesoporous structure, high reducibility, and basicity, which lead to superior carbon conversion to gas (77.66 mol%) and H2 yield (66.20 mol%). In addition, spent NiDLa exhibited the lowest amount of filamentous coke (110 mg/gcat) formation after 5 hours of reaction compared to the other catalysts investigated. Findings on effect of reaction condition revealed that higher temperature (> 750 oC), S/C ratio that is close to the stoichiometric value (1), and moderate GHSV (12,000 – 18,000 h-1) can improve carbon conversion to gas and H2 yield. The optimum conditions were found to be 775 oC of temperature, 1.02 of S/C molar ratio, and 14,648 h-1 of GHSV which resulted in 99.94 mol% of carbon conversion to gas and 82.84 mol% of H2 yield. This finding is close to the predicted 98.96 mol% of carbon conversion to gas and 82.00 mol% of H2 yield by response surface method. 2019 Thesis http://eprints.utm.my/id/eprint/87148/ http://eprints.utm.my/id/eprint/87148/1/TanRuShienMSChE2019.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:131863 masters Universiti Teknologi Malaysia, Faculty of Chemical and Energy Engineering Faculty of Chemical and Energy Engineering
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	TP Chemical technology
spellingShingle	TP Chemical technology Tan, Ru Shien Steam reforming of gasified biomass tar for hydrogen production over nickel–dolomite based catalyst
description	Catalytic steam reforming is a promising approach to address tar formation and improve hydrogen (H2) production from biomass gasification. In this research, multi-compound tar model (phenol, toluene, naphthalene, and pyrene) was steam reformed for H2 production over various types of 10 wt.% dolomite promoted 10 wt.% nickel based catalysts supported on alumina, lanthana, ceria, and zirconia. The research aims to synthesize nickel-dolomite catalyst for steam reforming of gasified biomass tar for optimum H2 production. The catalysts were characterized by thermogravimetric analysis, temperature programmed reduction, temperature programmed desorption, nitrogen physisorption, and X-ray diffraction. The results showed that the addition of dolomite promoter to the catalysts strengthened the metal-support interaction and basicity of the catalyst. Steam reforming for catalyst screening was carried out at 700 oC with steam to carbon (S/C) molar ratio of 1 and gas hourly space velocity (GHSV) of 20,453 mL/h·gcat. The Ni/dolomite/La2O3 (NiDLa) catalyst displayed mesoporous structure, high reducibility, and basicity, which lead to superior carbon conversion to gas (77.66 mol%) and H2 yield (66.20 mol%). In addition, spent NiDLa exhibited the lowest amount of filamentous coke (110 mg/gcat) formation after 5 hours of reaction compared to the other catalysts investigated. Findings on effect of reaction condition revealed that higher temperature (> 750 oC), S/C ratio that is close to the stoichiometric value (1), and moderate GHSV (12,000 – 18,000 h-1) can improve carbon conversion to gas and H2 yield. The optimum conditions were found to be 775 oC of temperature, 1.02 of S/C molar ratio, and 14,648 h-1 of GHSV which resulted in 99.94 mol% of carbon conversion to gas and 82.84 mol% of H2 yield. This finding is close to the predicted 98.96 mol% of carbon conversion to gas and 82.00 mol% of H2 yield by response surface method.
format	Thesis
qualification_level	Master's degree
author	Tan, Ru Shien
author_facet	Tan, Ru Shien
author_sort	Tan, Ru Shien
title	Steam reforming of gasified biomass tar for hydrogen production over nickel–dolomite based catalyst
title_short	Steam reforming of gasified biomass tar for hydrogen production over nickel–dolomite based catalyst
title_full	Steam reforming of gasified biomass tar for hydrogen production over nickel–dolomite based catalyst
title_fullStr	Steam reforming of gasified biomass tar for hydrogen production over nickel–dolomite based catalyst
title_full_unstemmed	Steam reforming of gasified biomass tar for hydrogen production over nickel–dolomite based catalyst
title_sort	steam reforming of gasified biomass tar for hydrogen production over nickel–dolomite based catalyst
granting_institution	Universiti Teknologi Malaysia, Faculty of Chemical and Energy Engineering
granting_department	Faculty of Chemical and Energy Engineering
publishDate	2019
url	http://eprints.utm.my/id/eprint/87148/1/TanRuShienMSChE2019.pdf
_version_	1747818527649169408

Steam reforming of gasified biomass tar for hydrogen production over nickel–dolomite based catalyst

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