{"title":"火焰温度对火焰辅助喷雾热解 Pt/CeO2 催化剂结构和 CO 氧化性能的影响","authors":"Naoya Minegishi , Peizhou Li , Tsuyoshi Nagasawa , Hidenori Kosaka","doi":"10.1016/j.jaecs.2024.100303","DOIUrl":null,"url":null,"abstract":"<div><div>Flame synthesis offers the potential for the synthesis of structure-controlled catalysts. In this study, Pt/CeO<sub>2</sub> 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, <span><math><msub><mi>T</mi><mi>f</mi></msub></math></span> = 1556, 1785, and 2026 K), and their particle structure and CO oxidation activity were evaluated. The synthesized Pt/CeO<sub>2</sub> catalysts had a bimodal structure containing 100 nm-scale CeO<sub>2</sub> loaded with 10 nm-scale Pt and fine CeO<sub>2</sub> < 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 CeO<sub>2</sub> particles dominates, resulting in an increase in BET specific surface area from 7.97 to 112 m<sup>2</sup>/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% (<em>T</em><sub>100</sub>) 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/CeO<sub>2</sub> catalyst made by FASP at <span><math><msub><mi>T</mi><mi>f</mi></msub></math></span> = 2026 K than that prepared by the impregnation method, and the <em>T</em><sub>100</sub> for CO oxidation was lower by 20 K.</div></div>","PeriodicalId":100104,"journal":{"name":"Applications in Energy and Combustion Science","volume":"20 ","pages":"Article 100303"},"PeriodicalIF":5.0000,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Effect of flame temperature on structure and CO oxidation properties of Pt/CeO2 catalyst by flame-assisted spray pyrolysis\",\"authors\":\"Naoya Minegishi , Peizhou Li , Tsuyoshi Nagasawa , Hidenori Kosaka\",\"doi\":\"10.1016/j.jaecs.2024.100303\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>Flame synthesis offers the potential for the synthesis of structure-controlled catalysts. In this study, Pt/CeO<sub>2</sub> 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, <span><math><msub><mi>T</mi><mi>f</mi></msub></math></span> = 1556, 1785, and 2026 K), and their particle structure and CO oxidation activity were evaluated. The synthesized Pt/CeO<sub>2</sub> catalysts had a bimodal structure containing 100 nm-scale CeO<sub>2</sub> loaded with 10 nm-scale Pt and fine CeO<sub>2</sub> < 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 CeO<sub>2</sub> particles dominates, resulting in an increase in BET specific surface area from 7.97 to 112 m<sup>2</sup>/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% (<em>T</em><sub>100</sub>) 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/CeO<sub>2</sub> catalyst made by FASP at <span><math><msub><mi>T</mi><mi>f</mi></msub></math></span> = 2026 K than that prepared by the impregnation method, and the <em>T</em><sub>100</sub> for CO oxidation was lower by 20 K.</div></div>\",\"PeriodicalId\":100104,\"journal\":{\"name\":\"Applications in Energy and Combustion Science\",\"volume\":\"20 \",\"pages\":\"Article 100303\"},\"PeriodicalIF\":5.0000,\"publicationDate\":\"2024-11-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Applications in Energy and Combustion Science\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S2666352X2400058X\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"ENERGY & FUELS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Applications in Energy and Combustion Science","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2666352X2400058X","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENERGY & FUELS","Score":null,"Total":0}
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 different flame temperatures (maximum flame temperatures, = 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 = 2026 K than that prepared by the impregnation method, and the T100 for CO oxidation was lower by 20 K.
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