Glycerol dry reforming for syngas production over ag-promoted on ni-based catalysts

The use of glycerol has been widely investigated and one of the possible alternatives is as a feedstock in the production of synthesis gas (syngas). The glycerol CO2 dry reforming process is an attractive process as it converts carbon dioxide, a greenhouse gas, into a synthesis gas and simultaneousl...

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Main Author:	Norazimah, Harun
Format:	Thesis
Language:	English
Published:	2017
Subjects:	TP Chemical technology
Online Access:	http://umpir.ump.edu.my/id/eprint/19630/19/Glycerol%20dry%20reforming%20for%20syngas%20production%20over%20ag-promoted%20on%20ni-based%20catalysts.pdf
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spelling	my-ump-ir.196302022-01-05T23:42:54Z Glycerol dry reforming for syngas production over ag-promoted on ni-based catalysts 2017-07 Norazimah, Harun TP Chemical technology The use of glycerol has been widely investigated and one of the possible alternatives is as a feedstock in the production of synthesis gas (syngas). The glycerol CO2 dry reforming process is an attractive process as it converts carbon dioxide, a greenhouse gas, into a synthesis gas and simultaneously removed from the carbon biosphere cycle. The main objective of this research work is to study the process of CO2 dry reforming of glycerol over noble catalyst i.e. a noble metal (silver) promoted on nickel-based catalyst supported on oxides (aluminium oxide and silicon oxide). Silver is rarely used as catalyst in reforming studies. However, it is proven that silver has the ability to reduce the carbon deposition and increase selectivity of hydrogen production besides lower in cost compared to other noble metal. The catalysts were formulated through wet impregnation method using different combinations of noble metal-oxides support. Their physicochemical characteristics were evaluated using nitrogen physisorption (Brunauer-Emmet-Teller (BET) method), X-ray diffraction (XRD), Scanning electron microscopy (SEM), Temperature programmed calcination (TPC), Temperature programmed reduction (H2-TPR) and Temperature programmed desorption (TPD). The screening study was conducted to evaluate the performance of different types of supports, and it was found that Ni/Al2O3 catalyst series gave higher glycerol conversion and hydrogen yield compared to Ni/SiO2 catalyst series due to their small crystallites size and high surface area. Moreover, alumina support could increase metal dispersion as well as avoiding the carbon deposition, which simultaneously improved the activity and stability of the catalyst. Apart from that, when different Ag loadings were introduced to these catalysts, 3wt% of Ag in Ni/Al2O3 was found to give the best catalyst performance due to the well-dispersion of active sites on the catalyst surface, which created high surface area. Higher Ag loading (>3wt%) resulted in formation of small particles, which covered the active sites of the catalyst thus impaired the catalyst performance. Further investigation on the effect of reaction variables (i.e. reaction temperature, weight hourly space velocity (WHSV) and CO2-to-glycerol ratio (CGR)) to the production of syngas were conducted using the best catalyst obtained from the screening study. The best reaction condition was found at temperature of 1073 K, CGR of 1 and WHSV of 36 L gcat-1 h-1 (catalyst loading of 0.2 g) which gave 41.09% glycerol conversion and 32.31% hydrogen yield. During the catalyst longevity study, Ag(3)-Ni/Al2O3 was found to stabilise along the 72 hours reaction after experiencing a reduction at tenth hour. Apart from that, the study on the catalyst deactivation of the used catalyst shows the presence of filamentous and encapsulated carbon types on the catalyst surface, which can be removed through oxidation. 2017-07 Thesis http://umpir.ump.edu.my/id/eprint/19630/ http://umpir.ump.edu.my/id/eprint/19630/19/Glycerol%20dry%20reforming%20for%20syngas%20production%20over%20ag-promoted%20on%20ni-based%20catalysts.pdf pdf en public masters Universiti Malaysia Pahang Faculty of Chemical and Natural Resources Engineering
institution	Universiti Malaysia Pahang Al-Sultan Abdullah
collection	UMPSA Institutional Repository
language	English
topic	TP Chemical technology
spellingShingle	TP Chemical technology Norazimah, Harun Glycerol dry reforming for syngas production over ag-promoted on ni-based catalysts
description	The use of glycerol has been widely investigated and one of the possible alternatives is as a feedstock in the production of synthesis gas (syngas). The glycerol CO2 dry reforming process is an attractive process as it converts carbon dioxide, a greenhouse gas, into a synthesis gas and simultaneously removed from the carbon biosphere cycle. The main objective of this research work is to study the process of CO2 dry reforming of glycerol over noble catalyst i.e. a noble metal (silver) promoted on nickel-based catalyst supported on oxides (aluminium oxide and silicon oxide). Silver is rarely used as catalyst in reforming studies. However, it is proven that silver has the ability to reduce the carbon deposition and increase selectivity of hydrogen production besides lower in cost compared to other noble metal. The catalysts were formulated through wet impregnation method using different combinations of noble metal-oxides support. Their physicochemical characteristics were evaluated using nitrogen physisorption (Brunauer-Emmet-Teller (BET) method), X-ray diffraction (XRD), Scanning electron microscopy (SEM), Temperature programmed calcination (TPC), Temperature programmed reduction (H2-TPR) and Temperature programmed desorption (TPD). The screening study was conducted to evaluate the performance of different types of supports, and it was found that Ni/Al2O3 catalyst series gave higher glycerol conversion and hydrogen yield compared to Ni/SiO2 catalyst series due to their small crystallites size and high surface area. Moreover, alumina support could increase metal dispersion as well as avoiding the carbon deposition, which simultaneously improved the activity and stability of the catalyst. Apart from that, when different Ag loadings were introduced to these catalysts, 3wt% of Ag in Ni/Al2O3 was found to give the best catalyst performance due to the well-dispersion of active sites on the catalyst surface, which created high surface area. Higher Ag loading (>3wt%) resulted in formation of small particles, which covered the active sites of the catalyst thus impaired the catalyst performance. Further investigation on the effect of reaction variables (i.e. reaction temperature, weight hourly space velocity (WHSV) and CO2-to-glycerol ratio (CGR)) to the production of syngas were conducted using the best catalyst obtained from the screening study. The best reaction condition was found at temperature of 1073 K, CGR of 1 and WHSV of 36 L gcat-1 h-1 (catalyst loading of 0.2 g) which gave 41.09% glycerol conversion and 32.31% hydrogen yield. During the catalyst longevity study, Ag(3)-Ni/Al2O3 was found to stabilise along the 72 hours reaction after experiencing a reduction at tenth hour. Apart from that, the study on the catalyst deactivation of the used catalyst shows the presence of filamentous and encapsulated carbon types on the catalyst surface, which can be removed through oxidation.
format	Thesis
qualification_level	Master's degree
author	Norazimah, Harun
author_facet	Norazimah, Harun
author_sort	Norazimah, Harun
title	Glycerol dry reforming for syngas production over ag-promoted on ni-based catalysts
title_short	Glycerol dry reforming for syngas production over ag-promoted on ni-based catalysts
title_full	Glycerol dry reforming for syngas production over ag-promoted on ni-based catalysts
title_fullStr	Glycerol dry reforming for syngas production over ag-promoted on ni-based catalysts
title_full_unstemmed	Glycerol dry reforming for syngas production over ag-promoted on ni-based catalysts
title_sort	glycerol dry reforming for syngas production over ag-promoted on ni-based catalysts
granting_institution	Universiti Malaysia Pahang
granting_department	Faculty of Chemical and Natural Resources Engineering
publishDate	2017
url	http://umpir.ump.edu.my/id/eprint/19630/19/Glycerol%20dry%20reforming%20for%20syngas%20production%20over%20ag-promoted%20on%20ni-based%20catalysts.pdf
_version_	1783732043895537664

Glycerol dry reforming for syngas production over ag-promoted on ni-based catalysts

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