Removal Of Hydrogen Sulfide From Biogas Using Ceo2 Naoh Psac Synthesis And Performance From Laboratory Scale To Scale Up Process Design

In this study, CeO2/NaOH/PSAC sorbent was successfully synthesized and applied in hydrogen sulfide removal from biogas. Preliminary study showed that the best synthesis route was using soaking method to impregnate cerium oxide and sodium hydroxide onto palm shell activated carbon (PSAC). In addit...

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Main Author:	Lau, Lee Chung
Format:	Thesis
Language:	English
Published:	2015
Subjects:	T Technology TP155-156 Chemical engineering
Online Access:	http://eprints.usm.my/47075/1/Removal%20Of%20Hydrogen%20Sulfide%20From%20Biogas%20Using%20Ceo2%20Naoh%20Psac%20Synthesis%20And%20Performance%20From%20Laboratory%20Scale%20To%20Scale%20Up%20Process%20Design.pdf
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spelling	my-usm-ep.470752021-11-17T03:42:18Z Removal Of Hydrogen Sulfide From Biogas Using Ceo2 Naoh Psac Synthesis And Performance From Laboratory Scale To Scale Up Process Design 2015-12-01 Lau, Lee Chung T Technology TP155-156 Chemical engineering In this study, CeO2/NaOH/PSAC sorbent was successfully synthesized and applied in hydrogen sulfide removal from biogas. Preliminary study showed that the best synthesis route was using soaking method to impregnate cerium oxide and sodium hydroxide onto palm shell activated carbon (PSAC). In addition, calcination must be applied as final step of the preparation because it increased the sorption capacity. Preparation parameters studied were impregnation time (0 – 180 min), cerium amount (1 – 10% wt Ce), sodium hydroxide concentration (0.2 – 1.0M NaOH), calcination temperature (250 – 500oC) and duration (1 – 4 hours). Optimization of sorbent preparation parameters was successful and the optimum values were 1.5 hours impregnation time, 5 wt% cerium, 1.0 M NaOH, 400oC calcination temperature and 3 hours of calcination time. Operating parameters that were found to affect the sorption capacity were sorption temperature, H2S concentration, sorbent amount, and flow rate. Maximum value of sorption capacity can be identified for each of these operating parameters. Moreover, other gas components such as water, carbon dioxide and methane can also affect the sorption capacity differently. Data analysis showed that Freundlich sorption isotherm can best described the sorption behavior. Thermodynamic study showed that enthalpy change (ΔH) and entropy change (ΔS) were calculated to be –6.0 kJ/mol and 25.7 J/mol.K. The sorption was pseudo–second order with activation energy 11.7 kJ/mol and rate constant was between 2.387–4.066 X 10-6 g/mg.min for temperature 30–70oC. Breakthrough curve was fitted well by using breakthrough model developed by Chu (2004). Up to 78% of original sorption capacity was achieved in the regeneration study using heat treatment under inert atmosphere. The regeneration temperature and time were 500oC and 4 hours, respectively. Scale up sorption process using the developed CeO2/NaOH/PSAC sorbent was successfully designed with a rate of return (ROR) of two years. Simulation study was also performed and increased efficiency at higher flow rate and smaller sorption column was discovered. 2015-12 Thesis http://eprints.usm.my/47075/ http://eprints.usm.my/47075/1/Removal%20Of%20Hydrogen%20Sulfide%20From%20Biogas%20Using%20Ceo2%20Naoh%20Psac%20Synthesis%20And%20Performance%20From%20Laboratory%20Scale%20To%20Scale%20Up%20Process%20Design.pdf application/pdf en public phd doctoral Universiti Sains Malaysia Pusat Pengajian Kejuruteraan Kimia
institution	Universiti Sains Malaysia
collection	USM Institutional Repository
language	English
topic	T Technology TP155-156 Chemical engineering
spellingShingle	T Technology TP155-156 Chemical engineering Lau, Lee Chung Removal Of Hydrogen Sulfide From Biogas Using Ceo2 Naoh Psac Synthesis And Performance From Laboratory Scale To Scale Up Process Design
description	In this study, CeO2/NaOH/PSAC sorbent was successfully synthesized and applied in hydrogen sulfide removal from biogas. Preliminary study showed that the best synthesis route was using soaking method to impregnate cerium oxide and sodium hydroxide onto palm shell activated carbon (PSAC). In addition, calcination must be applied as final step of the preparation because it increased the sorption capacity. Preparation parameters studied were impregnation time (0 – 180 min), cerium amount (1 – 10% wt Ce), sodium hydroxide concentration (0.2 – 1.0M NaOH), calcination temperature (250 – 500oC) and duration (1 – 4 hours). Optimization of sorbent preparation parameters was successful and the optimum values were 1.5 hours impregnation time, 5 wt% cerium, 1.0 M NaOH, 400oC calcination temperature and 3 hours of calcination time. Operating parameters that were found to affect the sorption capacity were sorption temperature, H2S concentration, sorbent amount, and flow rate. Maximum value of sorption capacity can be identified for each of these operating parameters. Moreover, other gas components such as water, carbon dioxide and methane can also affect the sorption capacity differently. Data analysis showed that Freundlich sorption isotherm can best described the sorption behavior. Thermodynamic study showed that enthalpy change (ΔH) and entropy change (ΔS) were calculated to be –6.0 kJ/mol and 25.7 J/mol.K. The sorption was pseudo–second order with activation energy 11.7 kJ/mol and rate constant was between 2.387–4.066 X 10-6 g/mg.min for temperature 30–70oC. Breakthrough curve was fitted well by using breakthrough model developed by Chu (2004). Up to 78% of original sorption capacity was achieved in the regeneration study using heat treatment under inert atmosphere. The regeneration temperature and time were 500oC and 4 hours, respectively. Scale up sorption process using the developed CeO2/NaOH/PSAC sorbent was successfully designed with a rate of return (ROR) of two years. Simulation study was also performed and increased efficiency at higher flow rate and smaller sorption column was discovered.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Lau, Lee Chung
author_facet	Lau, Lee Chung
author_sort	Lau, Lee Chung
title	Removal Of Hydrogen Sulfide From Biogas Using Ceo2 Naoh Psac Synthesis And Performance From Laboratory Scale To Scale Up Process Design
title_short	Removal Of Hydrogen Sulfide From Biogas Using Ceo2 Naoh Psac Synthesis And Performance From Laboratory Scale To Scale Up Process Design
title_full	Removal Of Hydrogen Sulfide From Biogas Using Ceo2 Naoh Psac Synthesis And Performance From Laboratory Scale To Scale Up Process Design
title_fullStr	Removal Of Hydrogen Sulfide From Biogas Using Ceo2 Naoh Psac Synthesis And Performance From Laboratory Scale To Scale Up Process Design
title_full_unstemmed	Removal Of Hydrogen Sulfide From Biogas Using Ceo2 Naoh Psac Synthesis And Performance From Laboratory Scale To Scale Up Process Design
title_sort	removal of hydrogen sulfide from biogas using ceo2 naoh psac synthesis and performance from laboratory scale to scale up process design
granting_institution	Universiti Sains Malaysia
granting_department	Pusat Pengajian Kejuruteraan Kimia
publishDate	2015
url	http://eprints.usm.my/47075/1/Removal%20Of%20Hydrogen%20Sulfide%20From%20Biogas%20Using%20Ceo2%20Naoh%20Psac%20Synthesis%20And%20Performance%20From%20Laboratory%20Scale%20To%20Scale%20Up%20Process%20Design.pdf
_version_	1747821753050071040

Removal Of Hydrogen Sulfide From Biogas Using Ceo2 Naoh Psac Synthesis And Performance From Laboratory Scale To Scale Up Process Design

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