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.

引用

页数：10

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