Fe-Encapsulated ZSM-5 Zeolite with Nanosheet-Assembled Structure for the Selective Catalytic Reduction of NOx with NH3

Liu, Baoyu; Zheng, Ke; Liao, Zhantu; Chen, Peirong; Chen, Dongdong; Wu, Ying; Xia, Qibin; Xi, Hongxia; Dong, Jinxiang

doi:10.1021/acs.iecr.0c01095

Cited by 13 publications

(4 citation statements)

References 61 publications

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“…Many zeolites with various framework types, such as MFI, BEA, CHA, AEI, ERI, KFI, AFX, DDR, RTH, SFW, LEV, LTA, RHO, and UFI, have been investigated as SCR catalysts [3][4][5][6][7][8]. Iwamoto et al [9,10] first reported the catalytic activity of Cu-ZSM-5 for the decomposition of NO.…”

Section: Introductionmentioning

confidence: 99%

Cu-IM-5 as the Catalyst for Selective Catalytic Reduction of NOx with NH3: Role of Cu Species and Reaction Mechanism

Chen

Liang

et al. 2021

Catalysts

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The role of Cu species in Cu ion-exchanged IM-5 zeolite (Cu-IM-5) regarding the performance in selective catalytic reduction (SCR) of NOx with NH3 (NH3-SCR) and the reaction mechanism was studied. Based on H2 temperature-programmed reduction (H2-TPR) and electron paramagnetic resonance (EPR) results, Cu–O–Cu and isolated Cu species are suggested as main Cu species existing in Cu-IM-5 and are active for SCR reaction. Cu–O–Cu species show a good NH3-SCR activity at temperatures below 250 °C, whereas their NH3 oxidation activity at higher temperatures hinders the SCR performance. At low temperatures, NH4NO3 and NH4NO2 are key reaction intermediates. In situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) suggests a mixed Eley–Rideal (E–R) and Langmuir–Hinshelwood (L–H) mechanism over Cu-IM-5 at low temperatures.

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Section: Introductionmentioning

confidence: 99%

Cu-IM-5 as the Catalyst for Selective Catalytic Reduction of NOx with NH3: Role of Cu Species and Reaction Mechanism

Chen

Liang

et al. 2021

Catalysts

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“…% H 2 O and 500 ppm SO 2 [99] . Significant sulfur resistance was reported also for other catalysts, including Fe‐encapsulated ZSM‐5 zeolite with nanosheet‐assembled structure [143] and Pr x Mn 1‐ x O δ /3DOM ZSM‐5 [144] …”

Section: Micro‐/mesoporous Zsm‐5‐based Catalystsmentioning

confidence: 76%

“…% H 2 O and 500 ppm SO 2 . [99] Significant sulfur resistance was reported also for other catalysts, including Fe-encapsulated ZSM-5 zeolite with nanosheet-assembled structure [143] and Pr x Mn 1-x O δ /3DOM ZSM-5. [144] Although in some of the above studies the authors (e. g., [130,140,141] ) claimed that the presence of mesopores can enable faster transport of the reactants to active sites this proposal has not been confirmed experimentally.…”

Section: Micro-/mesoporous Zsm-5-based Catalystsmentioning

confidence: 88%

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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“…XRD analysis was performed to investigate the crystal structures of the catalyst samples (not shown). The diffraction peaks at 2θ of 7.9°, 8.8°, 23.1°, and 23.8° were detected in all samples, which are attributed to characteristic diffraction signals of the ZSM-5 zeolite [6] , illustrating that the catalysts maintained the original crystal structure of the ZSM-5 zeolite.…”

Section: Xrd and Bet Analysismentioning

confidence: 81%

Effect of Ce-modified Fe/ZSM-5 zeolite for selective catalytic reduction of NO_x by ammonia

Meng

2020

E3S Web Conf.

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A series of xCe-Fe/ZSM-5 (x = 0, 0.25, 0.5 wt%) samples were prepared by the impregnation method, and the catalytic activity was evaluated by the selective catalytic reduction of NOx with ammonia (NH3-SCR). The physicochemical properties of prepared samples were characterized by various techniques such as X-ray diffraction (XRD), Brunner-Emmet-Teller (BET) measurement, hydrogen temperatureprogrammed reduction (H2-TPR), X-ray photoelectron spectroscopy (XPS), ammonia temperatureprogrammed desorption (NH3-TPD) and in situ diffuse reflectance infrared Fourier transform spectroscopy (in situ DRIFTS). XRD and BET results demonstrated that Ce and Fe species were uniform dispersed on the surface of the ZSM-5 zeolite and the micropore structure of ZSM-5 was still maintained. H2-TPR analysis indicated that the doping of Ce created more isolated Ce4+ and Fe3+ on the surface of catalysts, and the abundant Ce4+ and Fe3+ could enhance the reduction ability of catalysts. XPS analysis suggested that the doping of Ce could generate more oxygen vacancies, thereby increasing the number of chemisorption oxygen. According to the in-situ DRIFTS and NH3-TPD results, Ce species provided more acidic sites, which is beneficial to the NH3 adsorption ability of ZSM-5 zeolite. Additionally, the abundant chemisorption oxygen, medium and strong Brønsted acid sites, excellent NH3 adsorption ability and outstanding reduction property are beneficial to the NH3-SCR reaction. Among all prepared samples, the 0.25Ce-Fe/ZSM-5 sample possessed the widest reaction temperature window and the best catalytic performance (NO conversion over 98% at 350-450 °C), which was associated with the abundant acid sites and remarkable adsorption ability of NH3, outstanding redox ability and abundant chemisorption oxygen after the doping of Ce.

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Fe-Encapsulated ZSM-5 Zeolite with Nanosheet-Assembled Structure for the Selective Catalytic Reduction of NO_x with NH₃

Cited by 13 publications

References 61 publications

Cu-IM-5 as the Catalyst for Selective Catalytic Reduction of NOx with NH3: Role of Cu Species and Reaction Mechanism

Cu-IM-5 as the Catalyst for Selective Catalytic Reduction of NOx with NH3: Role of Cu Species and Reaction Mechanism

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

Effect of Ce-modified Fe/ZSM-5 zeolite for selective catalytic reduction of NO_x by ammonia

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Fe-Encapsulated ZSM-5 Zeolite with Nanosheet-Assembled Structure for the Selective Catalytic Reduction of NOx with NH3

Cited by 13 publications

References 61 publications

Cu-IM-5 as the Catalyst for Selective Catalytic Reduction of NOx with NH3: Role of Cu Species and Reaction Mechanism

Cu-IM-5 as the Catalyst for Selective Catalytic Reduction of NOx with NH3: Role of Cu Species and Reaction Mechanism

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

Effect of Ce-modified Fe/ZSM-5 zeolite for selective catalytic reduction of NOx by ammonia

Contact Info

Product

Resources

About

Fe-Encapsulated ZSM-5 Zeolite with Nanosheet-Assembled Structure for the Selective Catalytic Reduction of NO_x with NH₃

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

Effect of Ce-modified Fe/ZSM-5 zeolite for selective catalytic reduction of NO_x by ammonia