The effect of thermal treatment on the ITDI activated carbon and calcination temperature on the thermocatalytic decomposition of methane

Thermocatalytic decomposition of methane is the focus of this study because of its environmental considerations. Nickel has been known as the most efficient catalyst for methane decomposition. To increase the activity and lifetime of monometallic catalysts, the development of bimetallic catalysts ha...

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Main Author: Dao, Tam Nha
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Language:English
Published: Animo Repository 2011
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Online Access:https://animorepository.dlsu.edu.ph/etd_masteral/6925
https://animorepository.dlsu.edu.ph/context/etd_masteral/article/12778/viewcontent/CDTG005037_P.pdf
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spelling oai:animorepository.dlsu.edu.ph:etd_masteral-127782023-11-10T08:10:21Z The effect of thermal treatment on the ITDI activated carbon and calcination temperature on the thermocatalytic decomposition of methane Dao, Tam Nha Thermocatalytic decomposition of methane is the focus of this study because of its environmental considerations. Nickel has been known as the most efficient catalyst for methane decomposition. To increase the activity and lifetime of monometallic catalysts, the development of bimetallic catalysts has been investigated. It was reported that the addition of palladium into nickel catalyst could improve the catalytic activity and life time for methane decomposition into hydrogen and carbon fibers. This study determined the combined effect of thermal treatment and calcination temperature on ITDI-AC (Industrial Technology Development Institute-Activated carbon) for the thermocatalytic decomposition of methane. The temperature for thermal treatment of activated carbon as well as the calcination temperature of catalyst were varied. Catalyst surface area, morphology, surface elemental composition, total composition and crystal structure were determined using BET, SEM, AAS, and XRD respectively. Activity test of the catalyst for thermocatalytic decomposition of the methane was conducted to determine methane conversion and the hydrogen yield. BET results revealed that surface area of activated carbon decreased with an increase in the temperature for thermal treatment while there was no significant effect of the calcination temperature on the surface area of activated carbon. The surface area of PdNi/AC catalysts increased as calcination temperature increased. This is due to formation of larger pores with an increase in the temperature for thermal treatment. AAS results showed that the average surface nickel content and palladium content of the catalyst were 1.08 and 3.2 wt.%, respectively. SEM results revealed that the size of nickel particles was larger than that of palladium particles and there was a formation of carbon fiber at reaction temperatures of 750 and 950oC. This formation increased as reaction temperature increased. XRD results revealed that there was only Ni and Pd in the catalyst and there was a formation of Pd-Ni alloy at 950oC. The catalyst (sample code PdNi/AC700_500) which included palladium nickel over activated carbon thermally treated at 700oC and calcined at 500oC showed a higher catalytic activity at 950oC than the others with hydrogen yield of 0.4057 and methane conversion of 36.62%. PdNi/AC700_500 catalyst also showed high stability at 950oC with hydrogen yield of 0.0276 after 24h. 2011-10-01T07:00:00Z text application/pdf https://animorepository.dlsu.edu.ph/etd_masteral/6925 https://animorepository.dlsu.edu.ph/context/etd_masteral/article/12778/viewcontent/CDTG005037_P.pdf Master's Theses English Animo Repository Methane Catalysts Decomposition (Chemistry) Chemical Engineering
institution De La Salle University
building De La Salle University Library
continent Asia
country Philippines
Philippines
content_provider De La Salle University Library
collection DLSU Institutional Repository
language English
topic Methane
Catalysts
Decomposition (Chemistry)
Chemical Engineering
spellingShingle Methane
Catalysts
Decomposition (Chemistry)
Chemical Engineering
Dao, Tam Nha
The effect of thermal treatment on the ITDI activated carbon and calcination temperature on the thermocatalytic decomposition of methane
description Thermocatalytic decomposition of methane is the focus of this study because of its environmental considerations. Nickel has been known as the most efficient catalyst for methane decomposition. To increase the activity and lifetime of monometallic catalysts, the development of bimetallic catalysts has been investigated. It was reported that the addition of palladium into nickel catalyst could improve the catalytic activity and life time for methane decomposition into hydrogen and carbon fibers. This study determined the combined effect of thermal treatment and calcination temperature on ITDI-AC (Industrial Technology Development Institute-Activated carbon) for the thermocatalytic decomposition of methane. The temperature for thermal treatment of activated carbon as well as the calcination temperature of catalyst were varied. Catalyst surface area, morphology, surface elemental composition, total composition and crystal structure were determined using BET, SEM, AAS, and XRD respectively. Activity test of the catalyst for thermocatalytic decomposition of the methane was conducted to determine methane conversion and the hydrogen yield. BET results revealed that surface area of activated carbon decreased with an increase in the temperature for thermal treatment while there was no significant effect of the calcination temperature on the surface area of activated carbon. The surface area of PdNi/AC catalysts increased as calcination temperature increased. This is due to formation of larger pores with an increase in the temperature for thermal treatment. AAS results showed that the average surface nickel content and palladium content of the catalyst were 1.08 and 3.2 wt.%, respectively. SEM results revealed that the size of nickel particles was larger than that of palladium particles and there was a formation of carbon fiber at reaction temperatures of 750 and 950oC. This formation increased as reaction temperature increased. XRD results revealed that there was only Ni and Pd in the catalyst and there was a formation of Pd-Ni alloy at 950oC. The catalyst (sample code PdNi/AC700_500) which included palladium nickel over activated carbon thermally treated at 700oC and calcined at 500oC showed a higher catalytic activity at 950oC than the others with hydrogen yield of 0.4057 and methane conversion of 36.62%. PdNi/AC700_500 catalyst also showed high stability at 950oC with hydrogen yield of 0.0276 after 24h.
format text
author Dao, Tam Nha
author_facet Dao, Tam Nha
author_sort Dao, Tam Nha
title The effect of thermal treatment on the ITDI activated carbon and calcination temperature on the thermocatalytic decomposition of methane
title_short The effect of thermal treatment on the ITDI activated carbon and calcination temperature on the thermocatalytic decomposition of methane
title_full The effect of thermal treatment on the ITDI activated carbon and calcination temperature on the thermocatalytic decomposition of methane
title_fullStr The effect of thermal treatment on the ITDI activated carbon and calcination temperature on the thermocatalytic decomposition of methane
title_full_unstemmed The effect of thermal treatment on the ITDI activated carbon and calcination temperature on the thermocatalytic decomposition of methane
title_sort effect of thermal treatment on the itdi activated carbon and calcination temperature on the thermocatalytic decomposition of methane
publisher Animo Repository
publishDate 2011
url https://animorepository.dlsu.edu.ph/etd_masteral/6925
https://animorepository.dlsu.edu.ph/context/etd_masteral/article/12778/viewcontent/CDTG005037_P.pdf
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