Improved activity and durability of Rh-based three-way catalyst under diverse aging atmospheres by ZrO2 support

被引：22
作者：
Cao, Yidan [1 ]
Ran, Rui [1 ]
Wu, Xiaodong [2 ]
Zhao, Baohuai [2 ]
Weng, Duan [1 ,2 ]
机构：
[1] Tsinghua Univ, Minist Educ, Sch Mat Sci & Engn, Key Lab Adv Mat, Beijing 100084, Peoples R China
[2] Tsinghua Univ, Dept Mat Sci & Engn, State Key Lab New Ceram & Fine Proc, Beijing 100084, Peoples R China
来源：
JOURNAL OF ENVIRONMENTAL SCIENCES | 2017年 / 52卷
基金：
中国国家自然科学基金;
关键词：
Rhodium; Zirconia; Aging atmosphere; durability; EXHAUST-GAS CATALYSTS; PLUS NO REACTION; THERMAL-STABILITY; CO; RHODIUM; REDUCTION; OXIDATION; DISPERSION; INSIGHT; AL2O3;
D O I：
10.1016/j.jes.2016.04.017
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
The catalytic activity and durability of Rh/ZrO2 catalyst were investigated compared with Rh/Al2O3 catalyst under diverse aging atmospheres, including lean, rich and lean-rich cyclic aging atmospheres, to simulate the real working conditions of three-way catalyst. Oxidation states and microstructures of rhodium species were investigated to correlate with the catalytic performance of the catalysts. The catalytic performance and durability of the Rh catalyst under diverse aging atmospheres were drastically enhanced by ZrO2 support. ZrO2 support was confirmed to be able to effectively inhibit rhodium sintering even under diverse aging conditions. It can also successfully keep Rh species in an active low-valence state on the surface of the catalyst. The superiority of ZrO2 support compared to Al2O3 was verified by the Rh-based monolith catalyst. (C) 2016 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.
引用
收藏
页码：197 / 203
页数：7
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