Design of MoFe/Beta@CeO2 catalysts with a core−shell structure and their catalytic performances for the selective catalytic reduction of NO with NH3

Liu, Jixing; Du, Yuhao; Zhao, Zhen; Cheng, Kai; Chen, Yongsheng; Wei, Yuechang; Song, Weiyu; Zhang, Xiao

doi:10.1016/j.apcatb.2016.10.039

Cited by 112 publications

(47 citation statements)

References 59 publications

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“…The CeO 2 shell not only improved the thermal stability of the inside active core, but also inhibited the loss of active species by the formation of sulfate species. [48] Zhang's group did a lot of work in the design of poisoning-resistant oxide catalysts by core-shell structure. [24a,49] Zhang et al demonstrated that the mesoporous TiO 2 shell effectively inhibited the migration and agglomeration of the MnO x À CeO x core and prevented the blockage of active sites during the NH 3 À SCR.…”

Section: Porous Metal Oxidesmentioning

confidence: 99%

“…suggested that the strong interaction between the shell of CeO 2 and the core of MoFe oxides contributed to the enhanced NH 3 −SCR activity and SO 2 tolerance. The CeO 2 shell not only improved the thermal stability of the inside active core, but also inhibited the loss of active species by the formation of sulfate species [48] . Zhang's group did a lot of work in the design of poisoning‐resistant oxide catalysts by core‐shell structure [24a,49] .…”

Section: The Design Of Spatial Confined Architectures For Nh3−scr Catmentioning

confidence: 99%

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Spatially Nanoconfined Architectures: A Promising Design for Selective Catalytic Reduction of NO_x

Guo

Yang

2020

ChemCatChem

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Nitrogen oxides, including NO and NO 2 , are notorious air pollutants. The selective catalytic reduction of NO x with NH 3 (NH 3 À SCR) is the most widely studied and used technology for NO x removal. The spatially confined architectures in porous materials are promising designs for NH 3 À SCR catalysts. Porous metal oxides, metal-based zeolite, and the metal organic frameworks catalysts, featuring active sites disperse in the pores, cavities, and frameworks, are the most widely studied NH 3 À SCR catalysts. In this review, we review the application of these three typical catalysts for NH 3 À SCR, emphasizing the spatial confined structure provided by the porous materials.

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Section: Porous Metal Oxidesmentioning

confidence: 99%

Section: The Design Of Spatial Confined Architectures For Nh3−scr Catmentioning

confidence: 99%

Spatially Nanoconfined Architectures: A Promising Design for Selective Catalytic Reduction of NO_x

Guo

Yang

2020

ChemCatChem

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“…Nevertheless, it is noted that the hydrothermal stability and active window of these traditionally "mixed Fe-based" catalysts are still undesirable, especially in the presence of water vapor and sulfur dioxide, which can lead to the seriously deactivation of these cataysts. 15,16 Thus, it is very important to improve the intrinsic performance of the iron-based zeolite catalyst for its practical application.…”

Section: Introductionmentioning

confidence: 99%

Fe‐Beta@CeO₂ core‐shell catalyst with tunable shell thickness for selective catalytic reduction of NO_x with NH₃

Liu

Zhao

et al. 2017

AIChE Journal

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A series of core-shell structural deNO x catalysts using small-grain Beta supporting FeO x nanoparticles as the core and tunable CeO 2 thin film thickness as sheaths were designed and controllably synthesized. Their catalytic performances were tested for selective catalytic reduction of NO x with NH 3 (NH 3 -SCR). It was found that CeO 2 shell thickness plays an important role in influencing the acidity and redox properties of the catalysts. Fe-Beta@CeO 2 core-shell catalysts exhibit excellent resistance to H 2 O and SO 2 and high NO x conversion (above 90%) in the wide temperature range (225-5658C). The kinetics result indicates that the coating of CeO 2 shell significantly increases the pore diffusion resistance of Fe-Beta@CeO 2 catalysts. Furthermore, in situ DRIFT results reveal that CeO 2 shell can promote the formation of NO 2 and cis-N 2 O 2 2 species. But too thick CeO 2 shell ($20 nm) would result in the formation of inactive nitrate species, and thereby lead to a decrease of high-temperature activity of the catalysts.

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“…As is well known, NO x is one of main contaminants contained in diesel vehicle exhausts. While selective catalytic reduction with NH 3 (NH 3 ‐SCR) is regarded as the best way to remove NO x , therefore, the technology of denitrification is widely used . In NH 3 ‐SCR reaction system, the NH 3 can theoretically reduce NO x completely to N 2 , and the key point is to find an ideal catalyst.…”

Section: Introductionmentioning

confidence: 99%

A New Insight into Active Cu²⁺ Species Properties in One‐Pot Synthesized Cu‐SSZ‐13 Catalysts for NO_x Reduction by NH₃

2018

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The Cu‐SSZ‐13 catalysts with different copper content are prepared by one‐pot method and changing the mole ratio of Cu‐tetraethylenepentamine/Al2O3. Cu‐SSZ‐13 catalyst with 3.25 wt.% Cu exhibits excellent catalytic activity (operation temperature window of 145–490 °C), adaptability to high GHSV (gas hourly space velocity) and hydrothermal stability in NH3‐SCR reaction. The results of XRD Rietveld refinement coupled with H2‐TPR and EPR show that three active Cu2+ species (Cu1, Cu2 and Cu3) locate in various sites in the CHA (chabazite) structure and play different action in NH3‐SCR reaction. Cu1 species situated close to an eight‐membered‐ring play a crucial role in the low temperature activity for its optimum reduction ability. While Cu3 species located in the center of the hexagonal prism are the most stable and its content basically remains unchanged after SO2 pretreatment, which contributes to the excellent SO2 resistance.

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Design of MoFe/Beta@CeO2 catalysts with a core−shell structure and their catalytic performances for the selective catalytic reduction of NO with NH3

Cited by 112 publications

References 59 publications

Spatially Nanoconfined Architectures: A Promising Design for Selective Catalytic Reduction of NO_x

Spatially Nanoconfined Architectures: A Promising Design for Selective Catalytic Reduction of NO_x

Fe‐Beta@CeO₂ core‐shell catalyst with tunable shell thickness for selective catalytic reduction of NO_x with NH₃

A New Insight into Active Cu²⁺ Species Properties in One‐Pot Synthesized Cu‐SSZ‐13 Catalysts for NO_x Reduction by NH₃

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Design of MoFe/Beta@CeO2 catalysts with a core−shell structure and their catalytic performances for the selective catalytic reduction of NO with NH3

Cited by 112 publications

References 59 publications

Spatially Nanoconfined Architectures: A Promising Design for Selective Catalytic Reduction of NOx

Spatially Nanoconfined Architectures: A Promising Design for Selective Catalytic Reduction of NOx

Fe‐Beta@CeO2 core‐shell catalyst with tunable shell thickness for selective catalytic reduction of NOx with NH3

A New Insight into Active Cu2+ Species Properties in One‐Pot Synthesized Cu‐SSZ‐13 Catalysts for NOx Reduction by NH3

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Product

Resources

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Spatially Nanoconfined Architectures: A Promising Design for Selective Catalytic Reduction of NO_x

Spatially Nanoconfined Architectures: A Promising Design for Selective Catalytic Reduction of NO_x

Fe‐Beta@CeO₂ core‐shell catalyst with tunable shell thickness for selective catalytic reduction of NO_x with NH₃

A New Insight into Active Cu²⁺ Species Properties in One‐Pot Synthesized Cu‐SSZ‐13 Catalysts for NO_x Reduction by NH₃