An investigation into the use of mesoporous Pd films and silicon microfabricated microhotplates as a methane sensor
An investigation into the use of mesoporous Pd films and silicon microfabricated microhotplates as a methane sensor
Mesoporous Pd films with an hexagonal array of pores (H1-e Pd) were electrodeposited from an ammonium tetrachloropalladate dodecyl octa(ethylene oxide) template mixture in the hexagonal phase. The films were characterised using electrochemical techniques are found to have high surface areas of up to 56 m2 g-1. TEM analysis showed that the films had a regular array of pores with pore diameters of 3 nm.
H1-e Pd films were electro-deposited from Brij®56 – ammonium tetrachoropalladate template mixtures onto microhotplates and found to give reproducible, stable catalytic responses to methane. H1-e Pd films from Pd(NO3)2 precursors were found to have significantly greater initial catalytic activity. The maximum methane response was also greater.
The resistance of the methane responses to poisoning by hexamethyldisiloxane (HMDS) was also investigated. It was found that the response was rapidly and irreversibly poisoned. Attempts were made to improve the poison resistance. Mesoporous bi-layers with interconnecting pores were prepared by electodepositing mesoporous platinum on top of the palladium layer (H1-e Pd-Pt bi-layer). Results indicated that the methane response of these H1-e Pd-Pt bi-layers was poisoned more slowly.
The poisoning by HMDS in other flammable gases was also investigated. It was found that poisoning in n-butane was reversible whilst HMDS had negligible effect on the hydrogen response of mesoporous palladium catalysts.
University of Southampton
Dunford, Timothy Peter
49d55e1b-a93b-4e4d-8fa9-c4bb25269820
2006
Dunford, Timothy Peter
49d55e1b-a93b-4e4d-8fa9-c4bb25269820
Dunford, Timothy Peter
(2006)
An investigation into the use of mesoporous Pd films and silicon microfabricated microhotplates as a methane sensor.
University of Southampton, Doctoral Thesis.
Record type:
Thesis
(Doctoral)
Abstract
Mesoporous Pd films with an hexagonal array of pores (H1-e Pd) were electrodeposited from an ammonium tetrachloropalladate dodecyl octa(ethylene oxide) template mixture in the hexagonal phase. The films were characterised using electrochemical techniques are found to have high surface areas of up to 56 m2 g-1. TEM analysis showed that the films had a regular array of pores with pore diameters of 3 nm.
H1-e Pd films were electro-deposited from Brij®56 – ammonium tetrachoropalladate template mixtures onto microhotplates and found to give reproducible, stable catalytic responses to methane. H1-e Pd films from Pd(NO3)2 precursors were found to have significantly greater initial catalytic activity. The maximum methane response was also greater.
The resistance of the methane responses to poisoning by hexamethyldisiloxane (HMDS) was also investigated. It was found that the response was rapidly and irreversibly poisoned. Attempts were made to improve the poison resistance. Mesoporous bi-layers with interconnecting pores were prepared by electodepositing mesoporous platinum on top of the palladium layer (H1-e Pd-Pt bi-layer). Results indicated that the methane response of these H1-e Pd-Pt bi-layers was poisoned more slowly.
The poisoning by HMDS in other flammable gases was also investigated. It was found that poisoning in n-butane was reversible whilst HMDS had negligible effect on the hydrogen response of mesoporous palladium catalysts.
Text
1043589.pdf
- Version of Record
More information
Published date: 2006
Identifiers
Local EPrints ID: 466137
URI: http://eprints.soton.ac.uk/id/eprint/466137
PURE UUID: f8acd4e4-21b3-43c3-9976-f20c2ba4ba8b
Catalogue record
Date deposited: 05 Jul 2022 04:27
Last modified: 16 Mar 2024 20:32
Export record
Contributors
Author:
Timothy Peter Dunford
Download statistics
Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.
View more statistics