Effects of Crystallite Size on the Kinetics and Mechanism of NiO Reduction with H2
A kinetic investigation on the reduction of nanometer-sized nickel oxide particles (supported and unsupported) with hydrogen was carried out. The reduction behavior was found to be related to the average size of NiO crystallites. When the NiO crystallite size was less than about 20 nm, the dissociat...
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| Format: | Journal Article |
| Published: |
John Wiley & Sons, Inc.
2011
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| Online Access: | http://hdl.handle.net/20.500.11937/18846 |
| _version_ | 1848749863598030848 |
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| author | Syed-Hassan, Syed Li, Chun-Zhu |
| author_facet | Syed-Hassan, Syed Li, Chun-Zhu |
| author_sort | Syed-Hassan, Syed |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | A kinetic investigation on the reduction of nanometer-sized nickel oxide particles (supported and unsupported) with hydrogen was carried out. The reduction behavior was found to be related to the average size of NiO crystallites. When the NiO crystallite size was less than about 20 nm, the dissociation of H2 was the key rate-limiting factor and remained unchanged almost throughout the reduction process. However, when the NiO crystallite size was >20 nm, its reduction kinetics changed with conversion, showing two kinetic compensation effects at lower and higher NiO conversion levels. It is believed that the movement and rearrangement of H atoms inside such bulk Ni/NiO solid could be an important aspect of the reduction kinetics, especially at higher (50%–90%) NiO conversion levels. |
| first_indexed | 2025-11-14T07:27:42Z |
| format | Journal Article |
| id | curtin-20.500.11937-18846 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T07:27:42Z |
| publishDate | 2011 |
| publisher | John Wiley & Sons, Inc. |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-188462017-09-13T13:45:16Z Effects of Crystallite Size on the Kinetics and Mechanism of NiO Reduction with H2 Syed-Hassan, Syed Li, Chun-Zhu A kinetic investigation on the reduction of nanometer-sized nickel oxide particles (supported and unsupported) with hydrogen was carried out. The reduction behavior was found to be related to the average size of NiO crystallites. When the NiO crystallite size was less than about 20 nm, the dissociation of H2 was the key rate-limiting factor and remained unchanged almost throughout the reduction process. However, when the NiO crystallite size was >20 nm, its reduction kinetics changed with conversion, showing two kinetic compensation effects at lower and higher NiO conversion levels. It is believed that the movement and rearrangement of H atoms inside such bulk Ni/NiO solid could be an important aspect of the reduction kinetics, especially at higher (50%–90%) NiO conversion levels. 2011 Journal Article http://hdl.handle.net/20.500.11937/18846 10.1002/kin.20610 John Wiley & Sons, Inc. restricted |
| spellingShingle | Syed-Hassan, Syed Li, Chun-Zhu Effects of Crystallite Size on the Kinetics and Mechanism of NiO Reduction with H2 |
| title | Effects of Crystallite Size on the Kinetics and Mechanism of NiO Reduction with H2 |
| title_full | Effects of Crystallite Size on the Kinetics and Mechanism of NiO Reduction with H2 |
| title_fullStr | Effects of Crystallite Size on the Kinetics and Mechanism of NiO Reduction with H2 |
| title_full_unstemmed | Effects of Crystallite Size on the Kinetics and Mechanism of NiO Reduction with H2 |
| title_short | Effects of Crystallite Size on the Kinetics and Mechanism of NiO Reduction with H2 |
| title_sort | effects of crystallite size on the kinetics and mechanism of nio reduction with h2 |
| url | http://hdl.handle.net/20.500.11937/18846 |