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Huang, Junqin, Teng, Zihao, Kang, Running, Bin, Feng, Wei, Xiaolin, Hao, Qinglan, Nam Hui, Kwun, San Hui, Kwan 
ORCID: https://orcid.org/0000-0001-7089-7587 and Dou, Baojuan
(2021)
Study on activity, stability limit and reaction mechanism of CO self-sustained combustion over the LaMnO3, La0.9Ce0.1MnO3 and La0.9Sr0.1MnO3 perovskite catalysts using sugar agent.
Fuel, 292.
ISSN 0016-2361
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Abstract
The LaMnO 3, La 0.9Ce 0.1MnO 3 and La 0.9Sr 0.1MnO 3 catalysts are synthesized using sugar agent, and the CO self-sustained combustion is investigated, where the catalytic performance is decided by temperature with CO conversions of 10% (T 10), 50% (T 50), and 90% (T 90). The results show that self-sustaining combustion is successfully realized on the catalyst, and the order of activity decrease is as follows: La 0.9Ce 0.1MnO 3 (with sugar) > La 0.9Sr 0.1MnO 3 (with sugar) > LaMnO 3 (with sugar) > LaMnO 3 (without sugar) > La 0.9Sr 0.1MnO 3 (without sugar) > La 0.9Ce 0.1MnO 3 (without sugar). Combined with the results of XPS, H 2-TPR, O 2-TPD and CO-TPD techniques, the excellent activity of La 0.9Ce 0.1MnO 3 (with sugar) can be attributed to the high content of Mn 4+ ions and reactive oxygen vacancies enriched on the catalyst surface, sound low-temperature reduction, and uniform dispersion. Besides, in situ IR spectroscopy results indicate that the catalytic combustion of CO over manganese-based perovskite catalysts follows the L-H mechanism: the chemisorption of CO and O 2 takes place to produce monodentate carbonates and bicarbonate species, which then decompose to yield CO 2 release. The high-temperature stability test provides evidence that the La 0.9Ce 0.1MnO 3 (with sugar) gives 100% CO conversion and that the activities remain almost unchanged after reaction for 12 h, where the temperature of catalyst bed reaches about 717 °C. The results obtained are helpful to accept this technology on efficient and clean energy utilization in iron and steel industry.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | carbon monoxide,perovskite,self-sustained combustion,stability limit,sugar agent,chemical engineering(all),fuel technology,energy engineering and power technology,organic chemistry ,/dk/atira/pure/subjectarea/asjc/1500 |
| Faculty \ School: | Faculty of Science > School of Engineering Faculty of Science > School of Mathematics |
| UEA Research Groups: | Faculty of Science > Research Groups > Emerging Technologies for Electric Vehicles (EV) Faculty of Science > Research Groups > Energy Materials Laboratory |
| Related URLs: | |
| Depositing User: | LivePure Connector |
| Date Deposited: | 15 Apr 2021 23:49 |
| Last Modified: | 20 Apr 2023 20:35 |
| URI: | https://ueaeprints.uea.ac.uk/id/eprint/79788 |
| DOI: | 10.1016/j.fuel.2021.120289 |
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