Redispersion of PdOx to Pd ions in Pd/BEA and Pd/ZSM-5 during low-temperature NO adsorption in the presence of H2O and CO

被引：0
|
作者：
Wang, Yingjie [1 ,2 ,3 ]
Shi, Xiaoyan [3 ,4 ]
Wang, Yuxin [3 ,4 ]
Xu, Guangyan [3 ]
Shan, Yulong [3 ]
Yu, Yunbo [3 ,4 ]
He, Hong [3 ,4 ]
机构：
[1] Univ Sci & Technol China, Sch Rare Earths, Hefei 230026, Peoples R China
[2] Chinese Acad Sci, Ganjiang Innovat Acad, Ganzhou 341000, Peoples R China
[3] Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Joint Lab Environm Simulat & Pollut Cont, Beijing 100085, Peoples R China
[4] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
来源：
APPLIED CATALYSIS A-GENERAL | 2024年 / 672卷
基金：
国家重点研发计划; 中国国家自然科学基金;
关键词：
Passive NOx adsorber; Pd-based zeolite catalyst; Redispersion of PdOx; H2O and CO; PASSIVE NOX; ADSORBERS; PERFORMANCE; PALLADIUM; CONVERSION; CHEMISTRY; CATALYSTS; ZEOLITES; CATIONS; STORAGE;
D O I：
10.1016/j.apcata.2024.119605
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Pd-based zeolites are promising materials for passive NOx adsorbers (PNA) to remove cold-start NOx emissions. H2O and CO are common components in cold-start exhaust. In this work, Pd/BEA and Pd/ZSM-5 with similar to 1 wt% Pd were prepared to investigate the effect of H2O and CO on the NO uptake at low temperature (120 degrees C). It was found that Pd sites in Pd/ZSM-5 and Pd/BEA can be almost fully utilized as NO adsorption sites by formation of Pd-nitrosyl complexes in the presence of CO and H2O. By combining the results of NO adsorption reactions and in-situ DRIFTS, it was found that the redispersion of PdOx to Pd2+ ions can occur during NOx adsorption in the presence of CO and H2O and NO uptake via formation of Pd-nitrosyl complexes. A mechanism for the improvement of low-temperature NO uptake by Pd/BEA and Pd/ZSM-5 in the presence of CO and H2O was proposed.
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页数：10
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