Preparation, characterization, and properties of monolithic Fe/Al2O3/cordierite catalysts for NO reduction with C2H6

Zhou, Hao; Su, Yaxin; Liao, Wenyu; Deng, Wei; Zhong, Fangchuan

doi:10.1016/j.apcata.2015.08.025

Cited by 27 publications

(10 citation statements)

References 39 publications

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“…Different from the TPR profile of Fe 2 O 3 , the main reduction peaks of all Fe/Beta samples appeared above 600 • C, which were obvious higher than that of Fe 2 O 3 . According to our previous study [2,25], the TPR peaks of iron supported metal oxides (e.g., Al 2 O 3 , TiO 2 , and SiO 2 ) at temperature below 500 • C correspond to the reduction of Fe 3+ to Fe 2+ in nanoparticles, as well as the reduction of Fe 2 O 3 to Fe 3 O 4 , which indicated the presence of crystalline iron oxide phases. The difficulty in reducing the iron species implied that the chemical environment of the iron species of Fe/Beta was different from that of supported metal oxides.…”

Section: H 2 -Tprmentioning

confidence: 78%

“…According to our previous work [25,44], Fe 2 O 3 nanorods dispersed on the surface of supports play a crucial role for NO reduction while enhance the complete oxidation of hydrocarbon, then a small amount of excess hydrocarbons is required for achieving a satisfactory NO conversion in the presence of oxygen. Fierro et al [15] reported Fe x O y nanoparticles on over-exchanged Fe-ZSM-5 catalysts are not so effective for the HC-SCR reaction but enhance the propane combustion to CO 2 .…”

Section: Discussionmentioning

confidence: 99%

“…However, Fe x O y clusters have a higher oxidizing power than isolated Fe 3+ sites, then lead to the unselective oxidation of the isobutane reductant. Based on our previous work [25,46], the HC-SCR reaction usually begins with the formation of NO 2 /NO 3 − and C x H y O z species. Thus more isolated…”

Section: Discussionmentioning

confidence: 99%

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Selective Catalytic Reduction of Nitric Oxide with Propylene over Fe/Beta Catalysts Under Lean-Burn Conditions

Zhou

Zhao

et al. 2019

Catalysts

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Fe/Beta catalysts were used for the selective catalytic reduction of nitric oxide with propylene (C3H6-SCR) under lean-burn conditions, which were prepared by liquid ion-exchange (LIE), solid-state ion-exchange (SIE), and incipient wet-impregnation (IWI) methods. The iron species on Fe/Beta were characterized and identified by a combination of several characterization techniques. The results showed preparation methods had a significant influence on the composition and distribution of iron species, LIE method inclined to produce more isolated Fe3+ ions at ion-exchanged sites than IWI and SIE method. C3H6-SCR activity tests demonstrated Fe/Beta(LIE) possessed remarkable catalytic activity and N2 selectivity at temperature 300–450 °C. Kinetic studies of C3H6-SCR reaction suggested that isolated Fe3+ species were more active for NO reduction, whereas Fe2O3 nanoparticles enhanced the hydrocarbon combustion in excess of oxygen. According to the results of in situ DRIFTS, more isolated Fe3+ sites on Fe/Beta(LIE) would promote the formation of the key intermediates, i.e., NO2 adspecies and formate species, then led to the superior C3H6-SCR activity. The slight decrease of SCR activity after hydrothermal aging of Fe/Beta(LIE) catalyst might be due to the migration of isolated Fe3+ ions into oligomeric clusters and/or Fe2O3 nanoparticles.

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Section: H 2 -Tprmentioning

confidence: 78%

Section: Discussionmentioning

confidence: 99%

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Selective Catalytic Reduction of Nitric Oxide with Propylene over Fe/Beta Catalysts Under Lean-Burn Conditions

Zhou

Zhao

et al. 2019

Catalysts

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“…Giecko et al [15] interpret their TPR curve of Fe 2 O 3 /Al 2 O 3 catalysts assuming that the reduction takes place in two steps, with a peak in the 450-530 ºC zone, attributed to the reduction of Fe 2 O 3 to Fe 3 O 4 and a second peak between 750 and 850 ºC attributed to the reduction of Fe 3 O 4 or FeAl 2 O 4 to Fe 0 . In other cases [35], however, the TPR curve of supported Fe 2 O 3 is interpreted using the reduction scheme proposed by Zielinski et al described above [33].…”

Section: Temperature Programmed Reduction (Tpr)mentioning

confidence: 99%

ACTIVITY OF ALUMINA SUPPORTED Fe CATALYSTS FOR N2O DECOMPOSITION: EFFECTS OF THE IRON CONTENT AND THERMAL TREATMENT

Alvarez

Araya

Rojas

et al. 2017

J. Chil. Chem. Soc.

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The activity of Fe 2 O 3 /Al 2 O 3 catalysts prepared by impregnation of Al 2 O 3 with different amounts of Fe and calcination temperatures (650 and 900 ºC) in the direct N 2 O decomposition reaction was studied. High calcination temperature was introduced to study the effect of "aging", which are the conditions prevailing in the process-gas option for N 2 O abatement. The catalysts were characterized by BET, XRD, UV-DRS, and H 2-TPR. The incorporation of Fe promotes the alumina phase transition (g-Al 2 O 3 to a-Al 2 O 3) when the catalysts are calcined at 900 ºC, which is accompanied by a decrease in the specific area. The activity of the catalysts and the specific surface area depend on Fe loading and calcination temperature. It was found that highly dispersed Fe species are more active than bulk type Fe 2 O 3 particles. We conclude that Fe 2 O 3 /Al 2 O 3 catalysts prepared by impregnation method are active in the decomposition of N 2 O, to be used at low or high reaction temperatures (tail-gas or process-gas treatments, respectively), as part of nitric acid production plant.

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“…This, in addition to improving the stability of the catalyst, can increase the surface area. 33,[39][40][41][42][43][44][45] In the work reported here, the preparation of monolithic catalysts was proposed using commercial cordierite honeycombs as a structured substrate and alumina-supported iron oxide as active phase. This active phase was chosen because it showed good performance for degradation of organic compounds with hydrogen peroxide, [11][12][13][15][16][17] and also it meets the requirements of low cost and environmental friendliness.…”

Section: Introductionmentioning

confidence: 99%

Preparation, characterization, and application of nano‐FeO_x/Al₂O₃/cordierite monolithic catalysts for heterogeneous dark Fenton reaction

Martínez

Fixman

Cánepa

et al. 2020

J of Chemical Tech & Biotech

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BACKGROUND: Advanced oxidation processes are an interesting alternative for wastewater treatment. The classic Fenton process, involving ferrous ions and hydrogen peroxide, requires strict pH adjustment and further iron removal. To overcome these difficulties, heterogeneous reaction with solid catalysts has been proposed. Until now, the solid catalysts have been employed as powders in agitated batch reactors. In this work, the application of structured catalysts for processes in flow is proposed. Nano-FeO x /Al 2 O 3 /cordierite monolithic catalysts were prepared making firstly an alumina coating, and then impregnation with aqueous solution of iron nitrate at various concentrations. The synthesized catalysts were characterized using various techniques and then they were studied for the dark Fenton reaction. RESULTS: The coating adherence in the structured catalysts was better than 93%. Also, high homogeneity of the coating was confirmed. From results of physicochemical characterization, it was deduced that the active phase would consist of oligonuclear (FeO) n nanoclusters highly dispersed on the surface of the alumina support. The catalytic activity was evaluated in phenol peroxidation in aqueous phase (without light, pH 3, 30°C), as a model reaction. The monolithic catalysts were active and chemically stable. The most active catalyst (phenol conversion > 90% at 80 min of reaction) was reused 12 times. CONCLUSIONS: The monolithic catalysts show a high potential for application in heterogeneous dark Fenton-type reactions. Then, wastewater treatment by means of advanced oxidation processes could be carried out in continuous mode without further operation to separate the catalyst.

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Preparation, characterization, and properties of monolithic Fe/Al2O3/cordierite catalysts for NO reduction with C2H6

Cited by 27 publications

References 39 publications

Selective Catalytic Reduction of Nitric Oxide with Propylene over Fe/Beta Catalysts Under Lean-Burn Conditions

Selective Catalytic Reduction of Nitric Oxide with Propylene over Fe/Beta Catalysts Under Lean-Burn Conditions

ACTIVITY OF ALUMINA SUPPORTED Fe CATALYSTS FOR N2O DECOMPOSITION: EFFECTS OF THE IRON CONTENT AND THERMAL TREATMENT

Preparation, characterization, and application of nano‐FeO_x/Al₂O₃/cordierite monolithic catalysts for heterogeneous dark Fenton reaction

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Preparation, characterization, and properties of monolithic Fe/Al2O3/cordierite catalysts for NO reduction with C2H6

Cited by 27 publications

References 39 publications

Selective Catalytic Reduction of Nitric Oxide with Propylene over Fe/Beta Catalysts Under Lean-Burn Conditions

Selective Catalytic Reduction of Nitric Oxide with Propylene over Fe/Beta Catalysts Under Lean-Burn Conditions

ACTIVITY OF ALUMINA SUPPORTED Fe CATALYSTS FOR N2O DECOMPOSITION: EFFECTS OF THE IRON CONTENT AND THERMAL TREATMENT

Preparation, characterization, and application of nano‐FeOx/Al2O3/cordierite monolithic catalysts for heterogeneous dark Fenton reaction

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Preparation, characterization, and application of nano‐FeO_x/Al₂O₃/cordierite monolithic catalysts for heterogeneous dark Fenton reaction