Catalytic N2O decomposition and reduction by NH3 over Fe/Beta and Fe/SSZ-13 catalysts

Wang, Aiyong; Wang, Yilin; Walter, Éric; Kukkadapu, Ravi; Guo, Yanglong; Lu, Guanzhong; Weber, Robert S.; Peden, Charles H. F.; Gao, Feng

doi:10.1016/j.jcat.2017.12.011

Cited by 85 publications

(64 citation statements)

References 61 publications

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“…Small absorption band observed below 250 nm is possibly related to the presence of Fe 3+ cations in tetrahedral coordination, although it is also possible that this signal is associated with charge transfer (CT) in the zeolite framework (O 2-→ Al 3+ ) [47]. The following bands with maxima at about 250-300 and 300-400 nm can be connected with the presence of monomeric iron cations in octahedral coordination and FexOy oligomeric species, respectively, while the band located above 400 nm Fe2O3 is related to oxide particles [48,49]. In the case of the Fe-Beta and Fe-Beta/meso samples iron was introduced mainly in the form of monomeric Fe 3+ cations, while in the case of the samples modified by Fe3 oligocations the contribution of oligomeric species…”

Section: Samples Modified With Fexcry Oligocationsmentioning

confidence: 99%

Mesoporous Beta zeolite functionalisation with FexCry oligocations; catalytic activity in the NH3SCO process

Rutkowska

Duda

Macina

et al. 2019

Microporous and Mesoporous Materials

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In the presented studies H-Beta zeolite and H-Beta/meso (mesoporous Beta zeolite obtained by mesotemplate-free method) were modified with Fe3, Fe2Cr, FeCr2 and Cr3, triple-metallic aggregates (oligocations) by ion-exchange method (for comparison also modification with Fe isolated cations was done). Successful synthesis of mesoporous Beta zeolite was confirmed by several techniques such as N2-sorption, PXRD, AAS or NH3-TPD. Modified porosity and acidity of Beta zeolite, as well as the used source of metals, influenced the form (coordination and aggregation), content and reducibility of Fe-and Cr-species in the samples (UV-vis-DRS, AAS, H2-TPR). The obtained samples were tested as catalysts in the process of selective catalytic oxidation of ammonia to dinitrogen (NH3-SCO). The highest activity and selectivity

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Section: Samples Modified With Fexcry Oligocationsmentioning

confidence: 99%

Mesoporous Beta zeolite functionalisation with FexCry oligocations; catalytic activity in the NH3SCO process

Rutkowska

Duda

Macina

et al. 2019

Microporous and Mesoporous Materials

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“…[36][37][38][59][60][61] Also, in order to decrease the process temperature, the additional reducing agents in a gas mixture can be used, for example, carbon dioxide, methane, and ammonia. [62][63][64][65][66][67] It was shown that the preparation method also influences the catalytic activity. Samples of bare Co 3 O 4 were synthesized via sol-gel, calcination and precipitation methods 68 ; it was found that precipitated samples demonstrate a higher catalytic activity in the N 2 O decomposition process.…”

Section: Introductionmentioning

confidence: 99%

“…As a rule, in case of spinel‐type oxides, alkali, transition metals, and lanthanides are used as promoters, 45‐58 while for perovskite‐like oxides and hexaaluminates, Ba, Sr, Bi, Sn are often suggested 36‐38,59‐61 . Also, in order to decrease the process temperature, the additional reducing agents in a gas mixture can be used, for example, carbon dioxide, methane, and ammonia 62‐67 …”

Section: Introductionmentioning

confidence: 99%

Hydrothermal microwave‐assisted synthesis of LaFeO₃ catalyst for N₂O decomposition

et al. 2020

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Lanthanum orthoferrite powders were synthesized via one-step hydrothermal reactions under mild conditions using microwave and conventional heating. The use of microwave irradiation during the synthesis allows one to obtain nanocrystalline LaFeO 3 with a higher yield and reduced crystallite and particle size within a 16 times shorter duration (3 hours) at a lower temperature of 220°C as compared to the conventional heating. The catalytic decomposition of nitrous oxide was performed over both samples, it was shown that the sample obtained under microwave conditions demonstrates enhanced activity as a catalyst: N 2 O decomposes completely at 700°C over the catalyst formed at microwave conditions, while the comparative catalyst prepared by conventional heating reaches a lower conversion of only 60% at the same temperature and catalytic reaction conditions.

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“…In recent years, many researches have been focused upon the adsorption and decomposition of N 2 O on various catalyst surfaces. Through the experimental studies, it is known that spinel Ni 0.75 Co 2.25 O 4 modified with cesium cations [7], Fe/SSZ-13 [8], Co–Mn–Al mixed oxides [9] and Cu–Zn/ZnAl 2 O 4 [10] have good catalytic effects on the N 2 O decomposition.…”

Section: Introductionmentioning

confidence: 99%

DFT Study of N2O Adsorption onto the Surface of M-Decorated Graphene Oxide (M = Mg, Cu or Ag)

et al. 2019

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In order to reduce the harm of nitrous oxide (N2O) on the environment, it is very important to find an effective way to capture and decompose this nitrous oxide. Based on the density functional theory (DFT), the adsorption mechanism of N2O on the surfaces of M-decorated (M = Mg, Cu or Ag) graphene oxide (GO) was studied in this paper. The results show that the effects of N2O adsorbed onto the surfaces of Mg–GO by O-end and Cu–GO by N-end are favorable among all of the adsorption types studied, whose adsorption energies are −1.40 eV and −1.47 eV, respectively. Both adsorption manners belong to chemisorption. For Ag–GO, however, both the adsorption strength and electron transfer with the N2O molecule are relatively weak, indicating it may not be promising for N2O removal. Moreover, when Gibbs free energy analyses were applied for the two adsorption types on Mg–GO by O-end and Cu–GO by N-end, it was found that the lowest temperatures required to undergo a chemisorption process are 209 °C and 338 °C, respectively. After being adsorbed onto the surface of Mg–GO by O-end, the N2O molecule will decompose into an N2 molecule and an active oxygen atom. Because of containing active oxygen atom, the structure O–Mg–GO has strong oxidizability, and can be reduced to Mg–GO. Therefore, Mg–GO can be used as a catalyst for N2O adsorption and decomposition. Cu–GO can be used as a candidate material for its strong adsorption to N2O.

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Catalytic N2O decomposition and reduction by NH3 over Fe/Beta and Fe/SSZ-13 catalysts

Cited by 85 publications

References 61 publications

Mesoporous Beta zeolite functionalisation with FexCry oligocations; catalytic activity in the NH3SCO process

Mesoporous Beta zeolite functionalisation with FexCry oligocations; catalytic activity in the NH3SCO process

Hydrothermal microwave‐assisted synthesis of LaFeO₃ catalyst for N₂O decomposition

DFT Study of N2O Adsorption onto the Surface of M-Decorated Graphene Oxide (M = Mg, Cu or Ag)

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Catalytic N2O decomposition and reduction by NH3 over Fe/Beta and Fe/SSZ-13 catalysts

Cited by 85 publications

References 61 publications

Mesoporous Beta zeolite functionalisation with FexCry oligocations; catalytic activity in the NH3SCO process

Mesoporous Beta zeolite functionalisation with FexCry oligocations; catalytic activity in the NH3SCO process

Hydrothermal microwave‐assisted synthesis of LaFeO3 catalyst for N2O decomposition

DFT Study of N2O Adsorption onto the Surface of M-Decorated Graphene Oxide (M = Mg, Cu or Ag)

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Hydrothermal microwave‐assisted synthesis of LaFeO₃ catalyst for N₂O decomposition