Journal
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
Volume 58, Issue 48, Pages 22006-22014Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.iecr.9b05551
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Funding
- National Natural Science Foundation of China [21878213]
- Scientific Research Project of Jilin Provincial Education Department [JJKH20180554KJ]
- Program of Introducing Talents of Disciplines to China Universities [B06006]
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Herein, we report the high performance of Bi2O3 interacted with ultrafine CeO2 nanoparticles (NPs) for soot oxidation. With the increased Bi content, Bi2O3 can be tuned from the amorphous phase to beta-Bi2O3 and finally to alpha-Bi2O3. The ultrafine CeO2 NPs possessing abundant defects and large surface area are beneficial to forming beta-Bi2O3. Our kinetic results show that the quantity of active oxygen species at the Bi-O-Ce interface is the determining factor for soot oxidation. Compared with other Bi2O3 phases, the interaction between beta-Bi2O3 and CeO2 can readily generate a larger quantity of active surface oxygen species with a higher turnover frequency. Consequently, the Bi2Ce8 catalyst containing beta-Bi2O3 exhibits high activity and stability for soot oxidation and has the potential to be applied in real operations. Our discoveries provide insights into controlling active phase transformation and tuning interaction of metal oxides for various catalyst systems.
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