Na co-cations promoted stability and activity of Pd/SSZ-13 for low-temperature NO adsorption

被引：20

作者：

Li, Dan ^{[1
]}

Yang, Guoju ^{[2
]}

Chen, Mengyang ^{[2
]}

Pang, Lei ^{[3
]}

Guo, Yanbing ^{[4
]}

Yu, Jihong ^{[2
,5
]}

Li, Tao ^{[1
]}

机构：

[1] Huazhong Univ Sci & Technol, Sch Chem & Chem Engn, Hubei Key Lab Mat Chem & Serv Failure, Key Lab Mat Chem Energy Convers & Storage,Minist, Wuhan 430074, Peoples R China

[2] Jilin Univ, Coll Chem, State Key Lab Inorgan Synth & Preparat Chem, Changchun 130012, Peoples R China

[3] Dongfeng Trucks R&D Ctr, Wuhan 430056, Peoples R China

[4] Cent China Normal Univ, Coll Chem, Inst Environm & Appl Chem, Key Lab Pesticide & Chem Biol,Minist Educ, Wuhan 430079, Peoples R China

[5] Jilin Univ, Int Ctr Future Sci, Changchun 130012, Peoples R China

来源：

APPLIED CATALYSIS B-ENVIRONMENT AND ENERGY | 2022年 / 309卷

基金：

中国国家自然科学基金;

关键词：

Cold start; Low-temperature NO adsorption; Pd/SSZ-13; Na co-cations; Hydrothermal stability; SELECTIVE CATALYTIC-REDUCTION; HYDROTHERMAL STABILITY; SI/AL RATIO; ADSORBERS; PD; PERFORMANCE; ACTIVATION; EMISSIONS; ZEOLITES; SSZ-13;

D O I：

10.1016/j.apcatb.2022.121266

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：

The abatement of harmful nitrogen oxides (NOx) emission during vehicle cold start is challenging. Passive NOx adsorbers (PNAs) have proven to effectively alleviate NOx emission at low temperatures. In this work, Pd-based Na-SSZ-13 (Pd/Na-13) was synthesized and hydrothermally aged to investigate the effect of Na co-cations on the structure and activity of Pd/SSZ-13 for low-temperature NO adsorption. Compared to Pd-based NH4-SSZ-13 (Pd/NH4-13), Pd/Na-13 exhibited superior stability and activity promoted by Na co-cations in SSZ-13. DRIFTS and Al-27 MAS NMR demonstrated that Na co-cations protected Si-O(H)-Al bonds and thus helping to mitigate dealumination during hydrothermal aging. NO- and CO-DRIFTS studies proved that Pd2+ sites existed in aged Pd/Na-13 dominantly. Strikingly, the aged Pd/Na-13 exhibited excellent adsorption capacity with additional NO adsorption at above 100 degrees C. Our work reveals the co-cation effects on the local environments of Pd/SSZ-13, expecting to provide guidance on the catalyst modification or optimization for low-temperature NO adsorption.

引用

页数：12

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