Effect of flame temperature on structure and CO oxidation properties of Pt/CeO2 catalyst by flame-assisted spray pyrolysis
Flame synthesis offers the potential for the synthesis of structure-controlled catalysts. In this study, Pt/CeO2 nanoparticles were synthesized via flame-assisted spray pyrolysis (FASP) and used as CO oxidation catalysts. The catalysts were synthesized using a burner diffusion flame at three differe...
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Elsevier
2024-12-01
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| Series: | Applications in Energy and Combustion Science |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2666352X2400058X |
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| author | Naoya Minegishi Peizhou Li Tsuyoshi Nagasawa Hidenori Kosaka |
| author_facet | Naoya Minegishi Peizhou Li Tsuyoshi Nagasawa Hidenori Kosaka |
| author_sort | Naoya Minegishi |
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| description | Flame synthesis offers the potential for the synthesis of structure-controlled catalysts. In this study, Pt/CeO2 nanoparticles were synthesized via flame-assisted spray pyrolysis (FASP) and used as CO oxidation catalysts. The catalysts were synthesized using a burner diffusion flame at three different flame temperatures (maximum flame temperatures, Tf = 1556, 1785, and 2026 K), and their particle structure and CO oxidation activity were evaluated. The synthesized Pt/CeO2 catalysts had a bimodal structure containing 100 nm-scale CeO2 loaded with 10 nm-scale Pt and fine CeO2 < 10 nm loaded with highly dispersed Pt (less than 1 nm). As the flame temperature increases from 1556 to 2026 K, the formation of fine CeO2 particles dominates, resulting in an increase in BET specific surface area from 7.97 to 112 m2/g and Pt dispersion from 4.67 to 20.6%. Insight into the particle formation routes that determine the catalyst structure is provided by numerical simulation of droplet evaporation in a burner flame. CO oxidation experiments showed that the temperature at which CO conversion reached 100% (T100) decreased from 513 to 378 K with increasing flame temperature in FASP. In addition, the thermal stability test showed that the Pt dispersion after thermal degradation was higher for Pt/CeO2 catalyst made by FASP at Tf = 2026 K than that prepared by the impregnation method, and the T100 for CO oxidation was lower by 20 K. |
| format | Article |
| id | doaj-art-bef7b77a706941fbb82bd35ffbe59d98 |
| institution | Kabale University |
| issn | 2666-352X |
| language | English |
| publishDate | 2024-12-01 |
| publisher | Elsevier |
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| series | Applications in Energy and Combustion Science |
| spelling | doaj-art-bef7b77a706941fbb82bd35ffbe59d982024-11-21T06:06:36ZengElsevierApplications in Energy and Combustion Science2666-352X2024-12-0120100303Effect of flame temperature on structure and CO oxidation properties of Pt/CeO2 catalyst by flame-assisted spray pyrolysisNaoya Minegishi0Peizhou Li1Tsuyoshi Nagasawa2Hidenori Kosaka3School of Engineering, Department of Systems and Control Engineering, Institute of Science Tokyo, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8550, JapanSchool of Engineering, Department of Systems and Control Engineering, Institute of Science Tokyo, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8550, JapanSchool of Engineering, Department of Mechanical Engineering, Institute of Science Tokyo, Japan; Corresponding author.School of Engineering, Department of Mechanical Engineering, Institute of Science Tokyo, JapanFlame synthesis offers the potential for the synthesis of structure-controlled catalysts. In this study, Pt/CeO2 nanoparticles were synthesized via flame-assisted spray pyrolysis (FASP) and used as CO oxidation catalysts. The catalysts were synthesized using a burner diffusion flame at three different flame temperatures (maximum flame temperatures, Tf = 1556, 1785, and 2026 K), and their particle structure and CO oxidation activity were evaluated. The synthesized Pt/CeO2 catalysts had a bimodal structure containing 100 nm-scale CeO2 loaded with 10 nm-scale Pt and fine CeO2 < 10 nm loaded with highly dispersed Pt (less than 1 nm). As the flame temperature increases from 1556 to 2026 K, the formation of fine CeO2 particles dominates, resulting in an increase in BET specific surface area from 7.97 to 112 m2/g and Pt dispersion from 4.67 to 20.6%. Insight into the particle formation routes that determine the catalyst structure is provided by numerical simulation of droplet evaporation in a burner flame. CO oxidation experiments showed that the temperature at which CO conversion reached 100% (T100) decreased from 513 to 378 K with increasing flame temperature in FASP. In addition, the thermal stability test showed that the Pt dispersion after thermal degradation was higher for Pt/CeO2 catalyst made by FASP at Tf = 2026 K than that prepared by the impregnation method, and the T100 for CO oxidation was lower by 20 K.http://www.sciencedirect.com/science/article/pii/S2666352X2400058XFlame spray pyrolysisCatalystCO oxidationCharacterization |
| spellingShingle | Naoya Minegishi Peizhou Li Tsuyoshi Nagasawa Hidenori Kosaka Effect of flame temperature on structure and CO oxidation properties of Pt/CeO2 catalyst by flame-assisted spray pyrolysis Applications in Energy and Combustion Science Flame spray pyrolysis Catalyst CO oxidation Characterization |
| title | Effect of flame temperature on structure and CO oxidation properties of Pt/CeO2 catalyst by flame-assisted spray pyrolysis |
| title_full | Effect of flame temperature on structure and CO oxidation properties of Pt/CeO2 catalyst by flame-assisted spray pyrolysis |
| title_fullStr | Effect of flame temperature on structure and CO oxidation properties of Pt/CeO2 catalyst by flame-assisted spray pyrolysis |
| title_full_unstemmed | Effect of flame temperature on structure and CO oxidation properties of Pt/CeO2 catalyst by flame-assisted spray pyrolysis |
| title_short | Effect of flame temperature on structure and CO oxidation properties of Pt/CeO2 catalyst by flame-assisted spray pyrolysis |
| title_sort | effect of flame temperature on structure and co oxidation properties of pt ceo2 catalyst by flame assisted spray pyrolysis |
| topic | Flame spray pyrolysis Catalyst CO oxidation Characterization |
| url | http://www.sciencedirect.com/science/article/pii/S2666352X2400058X |
| work_keys_str_mv | AT naoyaminegishi effectofflametemperatureonstructureandcooxidationpropertiesofptceo2catalystbyflameassistedspraypyrolysis AT peizhouli effectofflametemperatureonstructureandcooxidationpropertiesofptceo2catalystbyflameassistedspraypyrolysis AT tsuyoshinagasawa effectofflametemperatureonstructureandcooxidationpropertiesofptceo2catalystbyflameassistedspraypyrolysis AT hidenorikosaka effectofflametemperatureonstructureandcooxidationpropertiesofptceo2catalystbyflameassistedspraypyrolysis |