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https://ptsldigital.ukm.my/jspui/handle/123456789/487202Full metadata record
| DC Field | Value | Language |
|---|---|---|
| dc.contributor.advisor | Zahira Yaakob, Prof. Ir. Dr. | - |
| dc.contributor.author | Norhasyimi Rahmat @ A Rahman (P83810) | - |
| dc.date.accessioned | 2023-10-11T02:30:17Z | - |
| dc.date.available | 2023-10-11T02:30:17Z | - |
| dc.date.issued | 2021-03-31 | - |
| dc.identifier.other | ukmvital:124567 | - |
| dc.identifier.uri | https://ptsldigital.ukm.my/jspui/handle/123456789/487202 | - |
| dc.description | Hydrogen has been identified as one of interesting zero concept emission fuel to power electricity and transportation. The production of hydrogen includes carbon dioxide reforming of methane with steam which is scarcely reported and still has a lot of areas and scopes for investigations. Therefore, the main objective of this research is to investigate the catalytic activity of newly synthesized nickel, ferum and cobalt supported magnesium aluminate, different causes of catalytic performance and the factors that cause carbon deposition. In the present study, nickel, ferum and cobalt supported magnesium aluminate samples were synthesised using the newly method of one-pot fusion-impregnation. The unsupported nickel, ferum and cobalt were also synthesised through one-pot fusion method particularly as a reference for determining causes of catalytic differences. The calcined catalysts were characterised using x-ray diffraction, nitrogen adsorption-desorption isotherms, Brunauer-Emmett-Teller surface area, Barrett, Joyner and Halenda method, high resolution transmission electron microscopy and field emission electron microscope, whereas the spent catalysts were characterised using x-ray diffraction, high resolution transmission electron microscopy, field emission scanning electron microscope, temperature programme oxidation, Raman spectroscopy, and thermogravimetric analysis. These catalysts have high surface areas and pore volumes, as well as narrow pore size distribution. They were used to investigate carbon dioxide reforming reaction of methane with steam at different metal loadings and reaction temperatures between 700 to 900 °C. Methane and carbon dioxide conversions, as well as hydrogen yield, showed the highest values at 25 wt% of cobalt loading, which started to decrease with increased metal loading of more than 40 wt%. 25 wt% nickel supported magnesium aluminate 25 wt% ferum supported magnesium aluminate and 25 wt% cobalt supported magnesium aluminate demonstrated the highest catalytic activity in comparison with other catalysts with different metal loading and unsupported catalysts. From optimization method in this study, 54% hydrogen yield, 94% methane conversion and 54% carbon dioxide conversion were achieved. It can be postulated from this study that the high surface area and high metal loading are not the only factors to determine the superior catalytic conversion. The high surface area demonstrated by unsupported nickel, ferum and cobalt turned out to reflect only a moderate catalytic performance. Nonetheless, the higher metal loading of more than 40 wt% demonstrated by nickel supported magnesium aluminate and cobalt supported magnesium aluminate also did not present an improved trend of catalytic activity. This implies a saturated and agglomerated particle condition that hindered oxidation of carbon on catalyst surface. Thus, it can be concluded that the high catalytic activity and the coke resistance in this study of carbon dioxide reforming of methane with steam are attributed to, which includes, the formation of metallic form of nickel, ferum and cobalt that participates in methane and carbon dioxide activation, the existence of metallic oxide which susceptible to combine with surface carbon as well as the surface basicity, the presence of respective, magnesium nickel oxide, magnesioferrite and magnesium cobaltite in the lattice structure and sufficient surface area for carbon dioxide chemisorption as well as oxygen mobility.,Ph.D. | - |
| dc.language.iso | eng | - |
| dc.publisher | UKM, Bangi | - |
| dc.relation | Faculty of Engineering and Built Environment / Fakulti Kejuruteraan dan Alam Bina | - |
| dc.rights | UKM | - |
| dc.subject | Universiti Kebangsaan Malaysia -- Dissertations | - |
| dc.subject | Dissertations, Academic -- Malaysia | - |
| dc.subject | Hydrogen | - |
| dc.subject | Fusion-impregnation | - |
| dc.subject | Catalysts | - |
| dc.title | Synthesis of nickel magnesium aluminate via fusion-impregnation for hydrogen production | - |
| dc.type | Theses | - |
| dc.format.pages | 195 | - |
| dc.identifier.barcode | 005823(2021)(PL2) | - |
| Appears in Collections: | Faculty of Engineering and Built Environment / Fakulti Kejuruteraan dan Alam Bina | |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| ukmvital_124567+SOURCE1+SOURCE1.0.PDF Restricted Access | 661.32 kB | Adobe PDF |  View/Open |
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