Dual bed catalytic reactor system for direct conversion of methane to liquid hydrocarbons

The feasibility of upgrading natural gas that primarily consists of methane to valuable chemicals, especially liquid fuel has been investigated for years. However, the high cost and inefficient processes have hampered the widespread exploitation of natural gas. Accordingly, a system comprising of a...

Full description

Saved in:

Bibliographic Details
Main Author:	Ammasi, Sriraj
Format:	Thesis
Language:	English
Published:	2005
Subjects:	TP Chemical technology
Online Access:	http://eprints.utm.my/id/eprint/3220/1/SrirajAmmasiMFKKSA2005.pdf
Tags:	Add Tag No Tags, Be the first to tag this record!

id	my-utm-ep.3220
record_format	uketd_dc
spelling	my-utm-ep.32202018-06-26T07:56:24Z Dual bed catalytic reactor system for direct conversion of methane to liquid hydrocarbons 2005-12 Ammasi, Sriraj TP Chemical technology The feasibility of upgrading natural gas that primarily consists of methane to valuable chemicals, especially liquid fuel has been investigated for years. However, the high cost and inefficient processes have hampered the widespread exploitation of natural gas. Accordingly, a system comprising of a dual-bed catalytic has been investigated in this study to overcome the limitations and permit the direct conversion of methane to liquid hydrocarbons. In this dual-bed system, methane is converted in the first stage to Oxidative Coupling of Methane(OCM) products over La/MgO and the second bed comprises of H-ZSM-5 that has been tested as an oligomerization function to convert the OCM products to liquid hydrocarbons. The influence of SiO2/Al2O3 ratio of H-ZSM-5, temperature and CH4/O2 ratio on the process has been studied. The results implied that the Bronsted acid sites of H-ZSM- 5 were the active centers responsible for the oligomerization of primary ethylene products. Oxygen was absolutely necessary for the formation of the methyl radicals from methane, but it should be provided at a controllable manner in order to avoid undesired oxidation. The partial destruction and dealumination of H-ZSM-5 at higher temperature had caused the deactivation of the H-ZSM-5 catalyst for the oligomerization reaction. Investigation on the catalytic activity of various metals loaded H-ZSM-5 showed that incorporating nickel into H-ZSM-5 significantly enhances the yield of liquid hydrocarbons. The central composite design (CCD) coupled with response surface methodology (RSM) was successfully applied to map the response and to obtain the optimal reaction design. The results indicated that the optimum C5+ yield of 8.91% was attained at reaction temperature = 742 ÂºC, CH4/O2 ratio = 9.7 and Ni loading = 0.67 wt%. This exploration suggests that the concept of this dual-bed catalytic system is an interesting candidate for application in methane utilization to produce liquid hydrocarbons 2005-12 Thesis http://eprints.utm.my/id/eprint/3220/ http://eprints.utm.my/id/eprint/3220/1/SrirajAmmasiMFKKSA2005.pdf application/pdf en public masters Universiti Teknologi Malaysia, Faculty of Chemical and Natural Resources Engineering Faculty of Chemical and Natural Resources Engineering
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	TP Chemical technology
spellingShingle	TP Chemical technology Ammasi, Sriraj Dual bed catalytic reactor system for direct conversion of methane to liquid hydrocarbons
description	The feasibility of upgrading natural gas that primarily consists of methane to valuable chemicals, especially liquid fuel has been investigated for years. However, the high cost and inefficient processes have hampered the widespread exploitation of natural gas. Accordingly, a system comprising of a dual-bed catalytic has been investigated in this study to overcome the limitations and permit the direct conversion of methane to liquid hydrocarbons. In this dual-bed system, methane is converted in the first stage to Oxidative Coupling of Methane(OCM) products over La/MgO and the second bed comprises of H-ZSM-5 that has been tested as an oligomerization function to convert the OCM products to liquid hydrocarbons. The influence of SiO2/Al2O3 ratio of H-ZSM-5, temperature and CH4/O2 ratio on the process has been studied. The results implied that the Bronsted acid sites of H-ZSM- 5 were the active centers responsible for the oligomerization of primary ethylene products. Oxygen was absolutely necessary for the formation of the methyl radicals from methane, but it should be provided at a controllable manner in order to avoid undesired oxidation. The partial destruction and dealumination of H-ZSM-5 at higher temperature had caused the deactivation of the H-ZSM-5 catalyst for the oligomerization reaction. Investigation on the catalytic activity of various metals loaded H-ZSM-5 showed that incorporating nickel into H-ZSM-5 significantly enhances the yield of liquid hydrocarbons. The central composite design (CCD) coupled with response surface methodology (RSM) was successfully applied to map the response and to obtain the optimal reaction design. The results indicated that the optimum C5+ yield of 8.91% was attained at reaction temperature = 742 ÂºC, CH4/O2 ratio = 9.7 and Ni loading = 0.67 wt%. This exploration suggests that the concept of this dual-bed catalytic system is an interesting candidate for application in methane utilization to produce liquid hydrocarbons
format	Thesis
qualification_level	Master's degree
author	Ammasi, Sriraj
author_facet	Ammasi, Sriraj
author_sort	Ammasi, Sriraj
title	Dual bed catalytic reactor system for direct conversion of methane to liquid hydrocarbons
title_short	Dual bed catalytic reactor system for direct conversion of methane to liquid hydrocarbons
title_full	Dual bed catalytic reactor system for direct conversion of methane to liquid hydrocarbons
title_fullStr	Dual bed catalytic reactor system for direct conversion of methane to liquid hydrocarbons
title_full_unstemmed	Dual bed catalytic reactor system for direct conversion of methane to liquid hydrocarbons
title_sort	dual bed catalytic reactor system for direct conversion of methane to liquid hydrocarbons
granting_institution	Universiti Teknologi Malaysia, Faculty of Chemical and Natural Resources Engineering
granting_department	Faculty of Chemical and Natural Resources Engineering
publishDate	2005
url	http://eprints.utm.my/id/eprint/3220/1/SrirajAmmasiMFKKSA2005.pdf
_version_	1747814443372249088

Dual bed catalytic reactor system for direct conversion of methane to liquid hydrocarbons

Similar Items