火焰喷雾热解合成Pt/TiO_(2)纳米颗粒的催化燃烧性能  

Catalytic Combustion Performance of Pt/TiO_(2)Nanoparticles Synthesized by Flame Spray Pyrolysis

作　　者：徐祖伟[1] 高富昌 龙周禾 赵海波[1] Xu Zuwei;Gao Fuchang;Long Zhouhe;Zhao Haibo(State Key Laboratory of Coal Combustion,School of Energy and Power Engineering,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]华中科技大学能源与动力工程学院煤燃烧国家重点实验室,武汉430074

出　　处：《燃烧科学与技术》2024年第2期103-110,共8页Journal of Combustion Science and Technology

基　　金：国家重点研发计划资助项目(2021YFF0601001);国家自然科学基金资助项目(52376111,51920105009).

摘　　要：采用火焰喷雾热解方法(FSP)合成了一系列不同Pt负载量的Pt/TiO_(2)催化剂,通过XPS、ICP-OES、ACHAADF-STEM、H_(2)-TPR等表征手段分析了催化剂的成分结构和金属-载体相互作用,在固定床催化反应系统上评估了这些催化剂对CO和CH_(4)的催化燃烧性能.结果表明,FSP合成的Pt/TiO_(2)催化剂具有较大的比表面积、Pt组分富集于TiO_(2)表面,能够显著降低CO和CH_(4)催化燃烧的反应温度,同时也具有较好的高温热稳定性.Pt组分的多种价态对CO和CH_(4)的催化表现出不同的特性,氧化态的单原子Pt对CO具有很好的低温催化活性,而金属态的颗粒Pt对CH_(4)的转化更有利.因此FSP能够在一定范围内调控贵金属催化剂的负载状态和配位环境以适应不同催化反应的需求,提高催化剂设计的灵活性和针对性.A series of Pt/TiO_(2)catalysts with different Pt loadings were synthesized by flame spray pyrolysis(FSP)method,and their compositional structures and metal-carrier interactions were analyzed by XPS,ICP-OES,ACHAADF-STEM,H_(2)-TPR and other characterization means.The catalytic combustion performance of the catalysts on CO and CH_(4)was evaluated on a fixed-bed catalytic reaction system.The results show that the Pt/TiO_(2)catalysts synthesized by FSP have a large specific surface area and the Pt fraction is enriched on the TiO_(2)surface,which can significantly reduce the reaction temperature of CO and CH_(4)catalytic combustion.Meanwhile,they have good high-temperature thermal stability.Various valence states of Pt fraction exhibit different catalytic combustion performance on CO and CH_(4),the oxidation state of single-atom PT shows good low-temperature CO catalytic activity,while the metallic state of particulate Pt is more favorable for the conversion of CH_(4).Therefore,FSP method can be adopted to regulate the loading state and coordination environment of noble metal catalysts within a certain range so as to adapt to different catalytic reactions and improve the flexibility and relevance of catalyst design.

关 键 词：火焰喷雾热解 单原子催化剂 催化燃烧 CO CH_(4) 

分 类 号：TK11[动力工程及工程热物理—热能工程]