- Title
- Reactivity of Pd–Cu/Al2O3 and Cu/Al2O3 during catalytic hydrogen combustion – In-situ mechanistic study and rate law determination
- Creator
- Kim, Jongho; Tahmasebi, Arash; Khoshk Rish, Salman; Jeon, Chung-Hwan; Yu, Jianglong
- Relation
- ARC.DP210103025 http://purl.org/au-research/grants/arc/DP210103025
- Relation
- Journal of the Energy Institute Vol. 109, Issue August 2023, no. 101297
- Publisher Link
- http://dx.doi.org/10.1016/j.joei.2023.101297
- Publisher
- Elsevier
- Resource Type
- journal article
- Date
- 2023
- Description
- This study compares the performance, including reactivity and stability, of Pd–Cu/Al2O3 and Cu/Al2O3 catalysts during catalytic hydrogen combustion in a temperature range of 20–600 °C. The physicochemical and catalytic properties of catalysts were characterized using various analytical techniques. The reaction rates were measured using a fixed-bed reactor connected to a micro-gas chromatograph, and the rate law equations containing a term for steam partial pressure were determined. The effects of reaction temperature and catalyst composition on the reaction mechanism were investigated using in-situ Fourier-transform infrared spectroscopy analysis, and the generation of OH groups was analyzed to compare the reaction pathways of catalytic hydrogen combustion over Pd–Cu/Al2O3 and Cu/Al2O3 catalysts. The results showed that at temperatures above 500 °C, Cu/Al2O3 achieved a comparable hydrogen conversion (96.5 and 98%) to that of Pd–Cu/Al2O3. The rate-limiting steps of catalytic combustion over Pd–Cu/Al2O3 and Cu/Al2O3 were the formation and breaking of metal-oxygen bonding, respectively. It was also found that the difference between the reactivity of Pd–Cu/Al2O3 and Cu/Al2O3 was less pronounced under wet conditions.
- Subject
- catalytic hydrogen combustion; reaction kinetics; palladium; copper; FTIR analysis
- Identifier
- http://hdl.handle.net/1959.13/1486236
- Identifier
- uon:51809
- Identifier
- ISSN:1743-9671
- Language
- eng
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