Preparation and catalytic performance of Fe-SBA-15 and FeO x /SBA-15 for toluene combustion

Zhang, Yujuan; Deng, Jiguang; Zhang, Lei; Dai, Hongxing

doi:10.1007/s11434-014-0494-0

Cited by 9 publications

(5 citation statements)

References 35 publications

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“…The values of T 50 and T 98 conversion for Al-rich Cu-*BEA indicate higher catalytic activity compared to most Fe and Cu oxides supported on silicalike materials (SBA-15, SBA-16) or aluminosilicates (montmorillonite, clinoptilolite, halloysite) (Table ). − While the Al-rich Cu-*BEA catalyst was more active than platinum in the oxidation of methane, the reaction rates for Al-rich Cu-*BEA in the toluene oxidation were approximately 2 times lower compared to those for the platinum-based Al-rich Pt-*BEA catalyst. The different order of the activities is most probably due to the different mechanisms of the oxidation of toluene proceeding via a surface dissociative adsorption of oxygen on Pt as the rate-determining step .…”

Section: Resultsmentioning

confidence: 99%

Effect of the Nuclearity and Coordination of Cu and Fe Sites in β Zeolites on the Oxidation of Hydrocarbons

et al. 2020

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Cu and Fe zeolites can activate oxygen for oxidative reactions of methane and stable hydrocarbon molecules. Here, we analyzed the activity of Cu and Fe sites with various nuclearities and coordinations in *BEA zeolites toward complete oxidation of methane, toluene, and ethanol by molecular oxygen. Spectral analysis of the interaction of methane with the individual Cu and Fe sites and a kinetic study show that the oxidation of methane is catalyzed by different active sites with different activation energies. In the low-temperature region (225–325 °C), the activity is primarily caused by reactive bridging oxygen atoms in dimeric Cu and Fe clusters. Isolated Fe3+-oxo ions in the octahedral coordination and Cu2+ partially charge-balanced by the framework with less rigid redox states contribute to the activity at higher temperatures of ≥350 °C. The isolated Fe3+-oxo ions tetrahedrally coordinated to the framework oxygen and the bare Cu2+ ions charge-balanced exclusively by the framework are strongly stabilized and cannot act as active sites. Oxidation of the hydrocarbons over both the dimeric and isolated Cu and Fe active sites is nonspecific with practically barrierless consecutive reactions of already activated molecules and therefore fully CO2-selective for all of the hydrocarbons in an excess of oxygen.

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Section: Resultsmentioning

confidence: 99%

Effect of the Nuclearity and Coordination of Cu and Fe Sites in β Zeolites on the Oxidation of Hydrocarbons

et al. 2020

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“…For supported iron oxide catalysts, the extent of iron oxide dispersion determines the catalytic activity. In particular, more highly dispersed iron oxide species have been reported to be more reducible than highly aggregated species, and consequently this leads to higher catalytic activity …”

Section: Introductionmentioning

confidence: 99%

“…In particular, more highly dispersed iron oxide species have been reported to be more reducible than highly aggregated species, and consequently this leads to higher catalytic activity. [20] For bulk oxide catalysts, the nano-architecture of the iron oxides does not seem to be of paramount importance for total oxidation of VOCs. Ordered mesoporous iron oxides can be highly active and stable, but do not seem to offer additional advantages when compared to other high surface area FeO x materials.…”

Section: Introductionmentioning

confidence: 99%

The Key Role of Nanocasting in Gold‐based Fe₂O₃ Nanocasted Catalysts for Oxygen Activation at the Metal‐support Interface

et al. 2019

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The total oxidation of propane, a representative Volatile Organic Compound, has been studied using gold‐based α‐Fe2O3 catalysts. Catalysts consisting of gold nanoparticles confined in nanostructured Fe2O3 prepared by a nanocasting route present the highest catalytic activity for propane total oxidation, and the activity is significantly greater than those of gold‐based catalysts where iron oxide supports are prepared by other conventional methods, such as calcination. Detailed characterisation and Density‐functional theory (DFT) studies have been undertaken in order to explain the enhancement in catalytic properties. The presence of confined gold nanoparticles on the nanocast Fe2O3 facilitates the production of highly reactive oxygen vacancies at the metal‐support interface, increasing the catalyst performance. Both the development of a microporous/mesoporous structure in the iron oxide support and the presence of a mixed surface phase of Si and Fe oxides, seem to be key parameters, being both features inherent in the nanocasting process from silica templates. Additionally, the catalytic activity is enhanced due to other positive effects, which are closely related to the nanocasting preparation method: i) a higher contact surface area between partially confined small gold nanoparticles in the internal mesoporosity of the nanostructured support and the metal oxide and; ii) a more reducible support due to the presence of more active surface lattice oxygen.

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“…All the above metal oxides are considered in the order of effectiveness for VOCs. Compared to others, cerium and 2 of 15 manganese oxides exhibited better catalytic activities at low temperatures in previous research [6][7][8][9]. Furthermore, both CeO 2 and MnO X have abundant valence changes of metal cations, surface defect sites and reactive oxygen species, which exhibit excellent electron transfer ability and make them potential catalysts [10][11][12].…”

Section: Introductionmentioning

confidence: 86%

Interfaces in MOF-Derived CeO2–MnOX Composites as High-Activity Catalysts for Toluene Oxidation: Monolayer Dispersion Threshold

et al. 2020

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A series of CeO2–MnOX catalysts with different Ce contents was prepared using Mn–BTC MOF as a sacrificial template for toluene oxidation. Interestingly, the performance of CeO2–MnOX increased rapidly only when the Ce content lower than 5%. The 1%-, 3%- and 10%-Ce-content samples exhibited the T90 value of 325 °C, 291 °C and 277 °C, respectively. XRD shows that the catalyst phase changes significantly before (Mn3O4 only) and after (Mn2O3, Mn3O4 and CeO2) 3% Ce loading. All other results indicated that the Ce–Mn interface properties of different Ce content composite oxides was quite distinguishable in terms of removal and energy efficiency. XRD and XPS results further showed that there a Ce monolayer dispersion threshold existed on the interface of MnOX (3.2 wt%, confirmed by XPS), which caused the difference in performance increment. The dispersed Ce could be divided into a monolayer dispersion state (1–3%) and a crystalline phase state (>3%), according to the existence form, which corresponded to the significant and minor enhancements of toluene conversion rate. Importantly, the Ce in monolayer dispersion state obviously improved the redox properties of catalysts interface, while the Ce in crystal state not. The interfaces with monolayer dispersion Ce result in more abundant metal ion states, oxygen vacancies, better electron transfer performance and catalytic activity.

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Preparation and catalytic performance of Fe-SBA-15 and FeO x /SBA-15 for toluene combustion

Abstract: High-surface-area and well-ordered mesopor-

Cited by 9 publications

References 35 publications

Effect of the Nuclearity and Coordination of Cu and Fe Sites in β Zeolites on the Oxidation of Hydrocarbons

Effect of the Nuclearity and Coordination of Cu and Fe Sites in β Zeolites on the Oxidation of Hydrocarbons

The Key Role of Nanocasting in Gold‐based Fe₂O₃ Nanocasted Catalysts for Oxygen Activation at the Metal‐support Interface

Interfaces in MOF-Derived CeO2–MnOX Composites as High-Activity Catalysts for Toluene Oxidation: Monolayer Dispersion Threshold

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Preparation and catalytic performance of Fe-SBA-15 and FeO x /SBA-15 for toluene combustion

Abstract: High-surface-area and well-ordered mesopor-

Cited by 9 publications

References 35 publications

Effect of the Nuclearity and Coordination of Cu and Fe Sites in β Zeolites on the Oxidation of Hydrocarbons

Effect of the Nuclearity and Coordination of Cu and Fe Sites in β Zeolites on the Oxidation of Hydrocarbons

The Key Role of Nanocasting in Gold‐based Fe2O3 Nanocasted Catalysts for Oxygen Activation at the Metal‐support Interface

Interfaces in MOF-Derived CeO2–MnOX Composites as High-Activity Catalysts for Toluene Oxidation: Monolayer Dispersion Threshold

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The Key Role of Nanocasting in Gold‐based Fe₂O₃ Nanocasted Catalysts for Oxygen Activation at the Metal‐support Interface