CeO_(2)-ZrO_(2)载体预处理对Pt、Pd基三效催化剂性能的影响  

Influence of Support Pretreatment on Pt and Pd-based TWCs Performance

作　　者：张俊 陈柳伶 苏敏 焦毅 王健礼[2] 胡志彪 张新波 姬存民 郑珩 ZHANG Jun;CHEN Liuling;SU Min;JIAO Yi;WANG Jianli;HU Zhibiao;ZHANG Xinbo;JI Cunmin;ZHENG Heng(Southwest Institute of Chemical Co.,Ltd.,State Key Laboratory of Industrial Vent Gas Reuse,National Engineering Research Center for C1 Chemistry,Chengdu 610225,China;College of Chemistry,Sichuan University,Chengdu 610064,China;Institute of New Energy and Low-Carbon Technology,Sichuan University,Chengdu 610207,China)

机构地区：[1]西南化工研究设计院有限公司,工业排放气综合利用国家重点实验室,国家碳一化学工程技术研究中心,四川成都610225 [2]四川大学化学学院,四川成都610064 [3]四川大学新能源与低碳技术研究院,四川成都610207

出　　处：《分子催化(中英文)》2025年第1期53-64,I0003,共13页Journal of Molecular Catalysis(China)

基　　金：四川省科技项目(2023ZDZX0005)。

摘　　要：金属-载体相互作用(MSI)能改变金属化学状态,与三效催化剂(TWCs)性能密切相关.采用热处理和NaBH4刻蚀两种手段预处理载体CeO_(2)-ZrO_(2)(CZ)调控MSI,载体热处理后的Pt/CZ高温热稳定性增强;而Pd/CZ活性降低.载体经NaBH4刻蚀后,Pt/CZ催化剂出现分相,MSI被削弱,较弱的相互作用使Pt颗粒烧结;而Pd/CZ则相反,相互作用较弱,使Pd物种更容易转变为活性物种,有效促进催化活性.此外,载体预处理引起的氧空位含量变化与MSI强度呈正相关,相较于NaBH4刻蚀CZ,载体经过热处理后催化剂氧空位含量更高.通过阐明MSI与TWCs性能之间的关系,为深入理解载体优化调控MSI提供了新的思路.Metal-support interaction(MSI)can change metal chemical state,which is closely related to three-way catalyst(TWCs)performance.The CeO_(2)-ZrO_(2)(CZ)support was pretreated by both heat treatment and NaBH4 etching to modulate the MSI of Pt-CZ and Pd-CZ.The Heat treatment significantly enhance the high-temperature stability of Pt/CZ,whereas the activity of Pd/CZ was observed to decrease.NaBH4 etching made the Pt/CZ catalyst appeared to be phased,the MSI was weakened.And the reduced interaction caused the sintering of Pt particles.For Pd/CZ,on the contrary,the weaker interaction facilitated to the conversion of Pd species into active species,thereby promoting catalytic activity.In addition,the change of oxygen vacancy content induced by support pretreatment was positively correlated with the MSI intensity,and the oxygen vacancy content in the catalyst was higher following heat treatment compared to NaBH_(4)etching of CZ support.By elucidating the relationship between MSI and the performance of TWCs,this work provides a new idea for a deeper understanding of support optimization to regulate MSI.

关 键 词：三效催化剂 CeO_(2)基复合氧化物 金属-载体相互作用 载体预处理 氧空位 

分 类 号：O643.32[理学—物理化学]