Effect of flame temperature on structure and CO oxidation properties of Pt/CeO2 catalyst by flame-assisted spray pyrolysis

IF 5 Q2 ENERGY & FUELS

Applications in Energy and Combustion Science Pub Date : 2024-11-01 DOI:10.1016/j.jaecs.2024.100303

Naoya Minegishi , Peizhou Li , Tsuyoshi Nagasawa , Hidenori Kosaka

{"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/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, <math><msub><mi>T</mi><mi>f</mi></msub></math> = 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 <math><msub><mi>T</mi><mi>f</mi></msub></math> = 2026 K than that prepared by the impregnation method, and the T100 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}

引用次数: 0

Abstract

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,

T_{f}

= 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

T_{f}

= 2026 K than that prepared by the impregnation method, and the T₁₀₀ for CO oxidation was lower by 20 K.

Abstract Image

查看原文本刊更多论文

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

火焰合成为合成结构可控的催化剂提供了可能。本研究通过火焰辅助喷雾热解（FASP）合成了 Pt/CeO2 纳米颗粒，并将其用作 CO 氧化催化剂。催化剂是在三种不同的火焰温度（最高火焰温度 Tf = 1556、1785 和 2026 K）下使用燃烧器扩散火焰合成的，并对其颗粒结构和 CO 氧化活性进行了评估。合成的 Pt/CeO2 催化剂具有双峰结构，其中 100 nm 级 CeO2 上负载有 10 nm 级 Pt，而细 CeO2 < 10 nm 上负载有高度分散的 Pt（小于 1 nm）。随着火焰温度从 1556 K 升至 2026 K，细小 CeO2 颗粒的形成占主导地位，导致 BET 比表面积从 7.97 m2/g 增至 112 m2/g，铂分散度从 4.67% 增至 20.6%。通过对燃烧器火焰中液滴蒸发的数值模拟，可以深入了解决定催化剂结构的颗粒形成途径。一氧化碳氧化实验表明，随着 FASP 中火焰温度的升高，一氧化碳转化率达到 100% 的温度（T100）从 513 K 降至 378 K。此外，热稳定性测试表明，在 Tf = 2026 K 时，FASP 制备的 Pt/CeO2 催化剂热降解后的铂分散度比浸渍法制备的催化剂高，CO 氧化的 T100 降低了 20 K。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Applications in Energy and Combustion Science

CiteScore

4.20

自引率

0.00%

发文量