Li, Cunshuo and Li, Wenzhi and Chen, Kun and Ogunbiyi, Ajibola T and Zhou, Zean and Duan, Qiuyan and Xue, Fengyang (2020) Highly active Pd catalysts supported on surface-modified cobalt-nickel mixed oxides for low temperature oxidation of lean methane. Fuel.
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Abstract
A highly active palladium catalyst supported on SiO2-modified cobalt-nickel mixed oxide (denoted as 0.5Pd/MCo1Ni4) was prepared and used for lean methane combustion. It was found that such a surface modification strategy enhanced the synergistic interaction between deposited palladium phase and reactive cobalt-nickel oxide, leading to substantial improvement in performance towards methane combustion. Over 0.5Pd/M-Co1Ni4, 90% methane conversion was realized at 323℃ and a space velocity of 60,000 mLg−1 h−1, which is 62 °C lower than that required for its untreated counterpart, 0.5Pd/Co1Ni4. The results of XRD, TEM, transmission FTIR and XPS demonstrated that the introduced SiO2, which was presented as an amorphous phase covering the carrier surface, could effectively tune the electronic structure of both Co1Ni4 support and palladium entities. More importantly, H2-TPR and O2-TPD results of 0.5Pd/M-Co1Ni4 revealed that the presence of SiO2 could enhance the low-temperature redox capability and increase the supply of oxygen species during the reaction process. We believe that the combination of PdOx (1 < x < 2) phase and modified Co1Ni4 oxide with low Co3+/Co2+ ratio was responsible for such an excellent performance of 0.5Pd/M-Co1Ni4. This work provides a feasible method for the design of efficient CCM catalysts with reduced palladium content by maximizing the palladium species and reactive host materials.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Palladium Cobalt-nickel mixed oxides Surface modification Synergistic interaction Lean methane combustion |
| Subjects: | T Technology > TP Chemical technology |
| Divisions: | Faculty of Engineering, Science and Mathematics > School of Engineering Sciences |
| Depositing User: | nwokealisi |
| Date Deposited: | 09 Oct 2023 15:07 |
| Last Modified: | 09 Oct 2023 15:07 |
| URI: | http://eprints.covenantuniversity.edu.ng/id/eprint/17363 |
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