Hydrothermal Deactivation of Fe-ZSM-5 Prepared by Different Methods for the Selective Catalytic Reduction of NOx with NH3

Shi, Xun; LIU, Fudong; Shan, Wenpo; He, Hui

doi:10.1016/s1872-2067(11)60326-4

Cited by 26 publications

(19 citation statements)

References 26 publications

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“…After the saturation of NH 3 adsorption over Fe-ZSM-5 catalysts, an obvious negative band at around 3610 cm −1 could be observed by in situ DRIFTS. This could be assigned to the OH stretching vibration mode, confirming the presence of abundant Brønsted acidic sites in these samples, and the negative band was mainly due to the relatively strong interaction between surface hydroxyls and NH 3 [26,39].…”

Section: Acid Sites Of Fe-zeolite Catalysts In the Nh 3 -Scr Reactionmentioning

confidence: 53%

“…However, they further pointed out that the SCR activity was more dependent on the preparation method than on the Fe loading, according to the sequence of CVD > reductive SSIE > impregnation [38]. Shi et al [39] concluded that the SCR activities of Fe-ZSM-5 catalysts prepared by different methods with similar Fe loadings were quite different ( Fig. 12.1).…”

Section: Summary Of Preparation Methodsmentioning

confidence: 99%

“…[52] investigated the hydrothermal stability of an Fe-ZSM-5 catalyst coated on cordierite and observed 5-15 % loss in the deNO x activity after hydrothermal aging at 650 °C in 10 % H 2 O for 50 h. The hydrothermal treatment could result in the dealumination of zeolite supports, leading to an decrease of Brønsted acid sites or breakdown of the framework structure, and more severely, the migration of active Fe 3+ species to form clustered Fe x O y /Fe 2 O 3 species, leading to the decline of NH 3 -SCR activity and N 2 selectivity [26,39,53,54]. Brandenberger et al [26] concluded that the hydrothermal breakdown of Fe-ZSM-5 catalyst was dominated by three parallel processes ( Fig.…”

Section: Hydrothermal Stability Of Fe-zeolite Catalysts For Nh 3 -Scrmentioning

confidence: 99%

“…The remaining NH 3 -SCR activity after hydrothermal aging under different conditions was mainly attributed to the residual monomeric Fe 3+ species located at ion exchange sites [26], and the loss of active Fe sites with high redox ability, rather than the loss of Brønsted acidity, was responsible for the decreased activity [50]. Besides, hydrothermal deactivation could result in a slight increase in the high temperature NH 3 -SCR activity of Fe-ZSM-5 catalysts, mainly due to a decrease in over-oxidation of the reducing agent NH 3 at high temperatures [26,39].…”

Section: Hydrothermal Stability Of Fe-zeolite Catalysts For Nh 3 -Scrmentioning

confidence: 99%

“…Recently, the data from Shi et al [39] showed that the difference in NO x conversion over Fe-ZSM-5 catalysts prepared from IE, SSIE and IWI methods became less distinct after hydrothermal aging at 700 °C for 8 h and was more significant over the fresh catalysts. Therefore, it seems that the influence of preparation methods on the hydrothermal stability of Fe-ZSM-5 catalysts is actually insignificant.…”

Section: Hydrothermal Stability Of Fe-zeolite Catalysts For Nh 3 -Scrmentioning

confidence: 99%

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Emerging Applications of Environmentally Friendly Zeolites in the Selective Catalytic Reduction of Nitrogen Oxides

Xie

Shi

2016

Green Chemistry and Sustainable Technology

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The catalytic removal of nitrogen oxides (NO x ) from diesel exhaust under oxygen-rich conditions remains a major challenge in the field of environmental catalysis, and the selective catalytic reduction of NO x with NH 3 (NH 3 -SCR), especially over zeolite catalysts, is a well-proven technique for the catalytic deNO x process for diesel vehicles. The comprehensive understanding of the structure-activity relationship of zeolite catalysts in the NH 3 -SCR reaction and the elucidation of the detailed reaction mechanism are very important for the practical use of these catalytic materials. In this chapter, using the environmentally friendly Fe-and Cu-based zeolite catalysts (i.e. Fe-ZSM-5, Cu-ZSM-5, Cu-SSZ-13 and Cu-SAPO-34, etc.) as examples, the influence of preparation methods on NH 3 -SCR performance, the role of metal active sites/surface acid sites, the impact of NO 2 and co-existing pollutants, the hydrothermal stability and also the possible SCR reaction pathways over these materials are discussed in detail, which can provide theoretical and empirical guidance for the redesign and activity improvement of these catalysts in their practical applications.

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Section: Acid Sites Of Fe-zeolite Catalysts In the Nh 3 -Scr Reactionmentioning

confidence: 53%

Section: Summary Of Preparation Methodsmentioning

confidence: 99%

Section: Hydrothermal Stability Of Fe-zeolite Catalysts For Nh 3 -Scrmentioning

confidence: 99%

Section: Hydrothermal Stability Of Fe-zeolite Catalysts For Nh 3 -Scrmentioning

confidence: 99%

Section: Hydrothermal Stability Of Fe-zeolite Catalysts For Nh 3 -Scrmentioning

confidence: 99%

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Emerging Applications of Environmentally Friendly Zeolites in the Selective Catalytic Reduction of Nitrogen Oxides

Xie

Shi

2016

Green Chemistry and Sustainable Technology

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Activity of Zeolitic Catalysts

Meng

Wang

Xiao

2017

Handbook of Solid State Chemistry

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Approximately nine‐out‐of‐ten chemical processes worldwide utilize heterogeneous catalysts currently, where selectivity for the shape/size of the reactant, product or intermediate together with stability are the vital aspects. Combination of selectivity and stability for zeolites offers unique structural and chemical features that can be beneficial for many commercially important reactions/processes. Typically, the introduction of zeolites into refinery operations has been revolutionary as it resulted in a significant increase in gasoline yield from catalytic cracking; zeolite catalysts are selective for the formation of light olefins from methanol and syngas and the production of chemicals and fuels for renewable carbon sources; the applications of zeolite catalysts for environmental protection offer good opportunities to develop selective catalytic reduction of harmful gases. In this chapter, an overview of the current and potential applications of zeolites as catalysts in academic and commercially important chemical industry reactions/processes is summarized.

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Recent Progress in the Application of Transition‐Metal Containing MFI topologies for NH₃‐SCR‐DeNO_x and NH₃ oxidation

Jabłońska,

Potter,

Beale

2024

ChemCatChem

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Transition metal‐containing MFI‐based catalysts are widely investigated in the selective catalytic reduction of NOx with ammonia (NH3‐SCR‐DeNOx), and the selective catalytic oxidation of ammonia (NH3‐SCO) into nitrogen and water vapor. While MFI‐based catalysts are less intensively studied than smaller pore zeolites (i.e., chabazite, CHA) they are still used commercially for these processes and are of great interest for future study in particular to better understand structure‐activity relationships. Hierarchically porous MFI catalysts (containing both micropores and mesopores) often show enhanced catalytic properties compared to conventional (microporous) materials in both NH3‐SCR‐DeNOx and NH3‐SCO. Thus, a critical overview of the current understanding of the salient physico‐chemical properties that influence the performance of these catalysts is examined. Furthermore, strategies for the development of ZSM‐5 based catalysts with enhanced catalytic lifetime, supported by the investigations of reaction mechanisms are reviewed and discussed.

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Hydrothermal Deactivation of Fe-ZSM-5 Prepared by Different Methods for the Selective Catalytic Reduction of NOx with NH3

Cited by 26 publications

References 26 publications

Emerging Applications of Environmentally Friendly Zeolites in the Selective Catalytic Reduction of Nitrogen Oxides

Emerging Applications of Environmentally Friendly Zeolites in the Selective Catalytic Reduction of Nitrogen Oxides

Activity of Zeolitic Catalysts

Recent Progress in the Application of Transition‐Metal Containing MFI topologies for NH₃‐SCR‐DeNO_x and NH₃ oxidation

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Hydrothermal Deactivation of Fe-ZSM-5 Prepared by Different Methods for the Selective Catalytic Reduction of NOx with NH3

Cited by 26 publications

References 26 publications

Emerging Applications of Environmentally Friendly Zeolites in the Selective Catalytic Reduction of Nitrogen Oxides

Emerging Applications of Environmentally Friendly Zeolites in the Selective Catalytic Reduction of Nitrogen Oxides

Activity of Zeolitic Catalysts

Recent Progress in the Application of Transition‐Metal Containing MFI topologies for NH3‐SCR‐DeNOx and NH3 oxidation

Contact Info

Product

Resources

About

Recent Progress in the Application of Transition‐Metal Containing MFI topologies for NH₃‐SCR‐DeNO_x and NH₃ oxidation