Recent progress in performance optimization of Cu-SSZ-13 catalyst for selective catalytic reduction of NOx

Li, Pan; Xin, Ying; Zhang, Hanxue; Yang, Fuzhen; Tang, Ahui; Han, Dongxu; Jia, Junxiu; Wang, Jin; Li, Zhenguo; Zhang, Zhaoliang

doi:10.3389/fchem.2022.1033255

Cited by 8 publications

(4 citation statements)

References 166 publications

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“…The deposition of copper in the zeolite support (in the amount of 2–4 wt%) increases the deNO x efficiency up to 95% [ 158 ]. The Cu-SSZ-13 catalyst has found commercial application in diesel engines to reduce nitrogen oxides in the exhaust [ 160 ]. Paolucci et al [ 161 ] presented the mechanism of the deNO x process on Cu-SSZ-34, paying particular attention to the redox cycle of copper forms that change their degree of oxidation: CuII ↔ CuI.…”

Section: Applications Of Zeolitesmentioning

confidence: 99%

Zeolite Properties, Methods of Synthesis, and Selected Applications

Kordala,

Wyszkowski

2024

Molecules

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Zeolites, a group of minerals with unique properties, have been known for more than 250 years. However, it was the development of methods for hydrothermal synthesis of zeolites and their large-scale industrial applications (oil processing, agriculture, production of detergents and building materials, water treatment processes, etc.) that made them one of the most important materials of the 20th century, with great practical and research significance. The orderly, homogeneous crystalline and porous structure of zeolites, their susceptibility to various modifications, and their useful physicochemical properties contribute to the continuous expansion of their practical applications in both large-volume processes (ion exchange, adsorption, separation of mixture components, catalysis) and specialized ones (sensors). The following review of the knowledge available in the literature on zeolites aims to present the most important information on the properties, synthesis methods, and selected applications of this group of aluminosilicates. Special attention is given to the use of zeolites in agriculture and environmental protection.

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Section: Applications Of Zeolitesmentioning

confidence: 99%

Zeolite Properties, Methods of Synthesis, and Selected Applications

Kordala,

Wyszkowski

2024

Molecules

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“…To comply with current and future emission regulations, it is urgent and imperative to eliminate NO x emissions from diesel engines. Among the various NO x removal technologies, the selective catalytic reduction of NO x with ammonia (NH 3 -SCR) is regarded as the most efficient method [4,5], and copper (Cu)-exchanged SSZ-13 zeolites are now commercial products for NH 3 -SCR catalysts due to their outperformance in reducing diesel engine NO x emissions compared with traditional vanadia-based (V 2 O 5 -WO 3 /TiO 2 ) catalysts [6][7][8][9][10]. However, the SSZ-13 zeolite has a chabazite (CHA) structure with a relatively small pore radius of 3.8 Å in an eight-membered ring, which may limit the mass transfer of reactants in channels [11,12].…”

Section: Introductionmentioning

confidence: 99%

Hard Template-Assisted Trans-Crystallization Synthesis of Hierarchically Porous Cu-SSZ-13 with Enhanced NH3-SCR Performance

et al. 2023

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Small porous Cu-SSZ-13 catalysts have recently been commercialized for the selective catalytic reduction of NOx with ammonia (NH3-SCR) on diesel vehicles. Unfortunately, the conventional Cu-SSZ-13 catalyst still confronts the challenge of diffusion limitations, which represent a major obstacle that reduces the catalyst’s SCR performance. Herein, a hierarchically porous SSZ-13 zeolite was synthesized via a trans-crystallization method assisted by the use of carbon black as a hard template in a short synthetic period, and the corresponding Cu-SSZ-13 catalysts with mesopores exhibited improved low-temperature activity and hydrothermal stability when compared with their microporous counterpart. A series of characterizations revealed that the mesopores are conducive to an increase in Cu loading while helping to stabilize the CHA structure and maintain the Cu species in their ionic form. More importantly, intra-particle diffusion limitations are reduced via the introduction of the mesopores owing to the shortened diffusion path inside the SSZ-13 zeolite, thus not only enhancing the active sites’ accessibility but also promoting the diffusion of the reactants and products. This work contributes to the design and synthesis of a high-performance Cu-SSZ-13 zeolite SCR catalyst for the removal of NOx emitted from diesel vehicles.

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“…Currently, selective catalytic reduction (SCR) of NO x with ammonia (NH 3 ) has been proven to be one of the most efficient technologies for NO x purification [2]. Cu-based small-pore zeolite SCR catalysts (especially Cu-SSZ-13 zeolite with a CHA structure) have been widely adopted in diesel engines owing to their wide active temperature window and hydrothermal stability [3][4][5]. In practical applications, the periodically increased exhaust temperature required to stimulate diesel particulate filter (DPF) regeneration necessitates SCR catalysts with high hydrothermal stability [6].…”

Section: Introductionmentioning

confidence: 99%

Enhanced Low-Temperature Activity and Hydrothermal Stability of Ce-Mn Oxide-Modified Cu-SSZ-39 Catalysts for NH3-SCR of NOx

Tang,

Yang,

Xin

et al. 2023

Catalysts

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Cu-SSZ-39 zeolite with an AEI structure exhibits excellent hydrothermal stability and can be a potential alternative to Cu-SSZ-13 zeolite SCR catalysts for NOx removal in diesel vehicles. However, the inferior low-temperature performance of Cu-SSZ-39 leads to substantial NOx emissions during the cold-start period, impeding its practical application. In this study, Ce-Mn oxide-modified Cu-SSZ-39 catalysts (CeMnOx/Cu-SSZ-39) and references (CeO2/Cu-SSZ-39 and MnOx/Cu-SSZ-39) were prepared by the ion-exchange of Cu ions followed by impregnation of the oxide precursors, with the aim of enhancing the NH3-SCR performance at low temperatures. The modified catalysts exhibited improved low-temperature activity and hydrothermal stability compared to the unmodified counterpart. In particular, CeMnOx/Cu-SSZ-39 showed the highest activity among the three catalysts and achieved NOx conversions above 90% within the temperature range of 180 °C to 600 °C, even after undergoing hydrothermal aging at 800 °C. Experimental results indicated that the synergistic effect between Ce and Mn in CeMnOx improves the redox properties and acidity of the catalyst due to the presence of Ce3+, Mn4+, and abundant adsorbed oxygen species, which facilitate low-temperature SCR reactions. Furthermore, the interaction of CeMnOx with Cu-SSZ-39 stabilizes the zeolite framework and hinders the agglomeration of Cu species during the hydrothermal aging process, contributing to its exceptional hydrothermal stability. The kinetics and NO oxidation experiments demonstrated that CeMnOx provides access to fast SCR reaction pathways by oxidizing NO to NO2, resulting in a significant increase in low-temperature activity. This study provides novel guidelines for the design and preparation of Cu-SSZ-39 zeolite with outstanding SCR performance over a wide temperature range.

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Recent progress in performance optimization of Cu-SSZ-13 catalyst for selective catalytic reduction of NOx

Cited by 8 publications

References 166 publications

Zeolite Properties, Methods of Synthesis, and Selected Applications

Zeolite Properties, Methods of Synthesis, and Selected Applications

Hard Template-Assisted Trans-Crystallization Synthesis of Hierarchically Porous Cu-SSZ-13 with Enhanced NH3-SCR Performance

Enhanced Low-Temperature Activity and Hydrothermal Stability of Ce-Mn Oxide-Modified Cu-SSZ-39 Catalysts for NH3-SCR of NOx

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