Three-dimensionally ordered and wormhole-like mesoporous iron oxide catalysts highly active for the oxidation of acetone and methanol

Xia, Yunsheng; Dai, Hongxing; Jiang, Haiyan; Zhang, Lei; Deng, Jiguang; Liu, Yuxi

doi:10.1016/j.jhazmat.2010.10.073

Cited by 81 publications

(38 citation statements)

References 35 publications

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“…Iron oxide, apart from being inexpensive, environmentally friendly and readily available, is conveniently synthesised, and it is also reasonably active for the total oxidation of VOCs including propane. [16][17][18][19] For bulk iron oxide catalysts, it has been observed that high surface area and reducibility of the iron species are the key parameters needed to achieve high catalytic activity. This is in accordance with the redox Mars-van Krevelen mechanism that controls the oxidation of propane on iron oxide.…”

Section: Introductionmentioning

confidence: 99%

“…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. [18,19] Gold supported on nanostructured iron oxide has previously been prepared and tested as a catalyst for CO oxidation, and they show higher activities than other Au/FeO x catalysts. [21] This improved performance, in addition to factors such as small particle size and high surface area, is also related to the presence of a large amount of hydroxylated iron species.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Introductionmentioning

confidence: 99%

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 high cost, inferior thermal stability and low resistance to poisoning of noble metals limit their practical large-scale application, especially in the case of CVOC destruction [5,6]. Transition metal oxides are a proper alternative owing to their excellent thermal stability, superior durability against deactivation, and lower price [7]. Nonporous zirconia-based catalysts, manganese and copper oxides, have been claimed for their effectiveness in CVOC destruction or dechlorination reactions [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Catalytic destruction of chlorobenzene over mesoporous ACeOx (A=Co, Cu, Fe, Mn, or Zr) composites prepared by inorganic metal precursor spontaneous precipitation

Shi

et al. 2015

Fuel Processing Technology

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Mesostructured ACeO x (A = Co, Cu, Fe, Mn, or Zr) composites with large specific surface area and developed mesoporosity were prepared by inorganic metal precursor spontaneous precipitation (IMSP) method. Influences of catalyst surface area, pore structure, reducibility, and active oxygen concentration on catalytic performance were studied. Both preparation route and metal precursor type affect metal active site dispersion, and the IMSP is a desirable approach for synthesis of metal composites with homogeneous active phase distribution. The original crystalline structure of CeO 2 is well maintained although parts of transition metal cations are incorporated into its framework. The forming of A n+ -O 2− -Ce 4+ connections in ACeO x catalysts could reduce the redox potential of metal species, allowing effective redox cycles during oxidation reactions. CuCeO x demonstrates powerful catalytic efficiency with 99% of chlorobenzene (CB) destructed at 328°C, which is much lower than the other ACeO x oxides and Cu-doped catalysts synthesized via the incipient impregnation and coprecipitation methods (T 99 N 405°C). The active site reducibility is the foremost activity determining factor for CB destruction.

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“…Among transition metal oxides, those of manganese and cobalt have shown an excellent catalytic performance, in some cases comparable to noble metal-derived catalysts [7,8]. Iron oxide catalysts, if conveniently prepared [9,10,11,12,13], can also present high catalytic activity, being of great interest environmentally, as they are abundant and non-toxic. Thus, bare ferrite-type iron oxides or those impregnated on clays [14,15], obtained from different sources with positive environmental implications, have been studied [16].…”

Section: Introductionmentioning

confidence: 99%

Eco-Friendly Cavity-Containing Iron Oxides Prepared by Mild Routes as Very Efficient Catalysts for the Total Oxidation of VOCs

et al. 2018

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Iron oxides (FeOx) are non-toxic, non-expensive and environmentally friendly compounds, which makes them good candidates for many industrial applications, among them catalysis. In the present article five catalysts based on FeOx were synthesized by mild routes: hydrothermal in subcritical and supercritical conditions (Fe-HT, Few200, Few450) and solvothermal (Fe-ST1 and Fe-ST2). The catalytic activity of these catalysts was studied for the total oxidation of toluene using very demanding conditions with high space velocities and including water and CO2 in the feed. The samples were characterized by X-ray diffraction (XRD), scanning and high-resolution transmission electron microscopy (SEM and HRTEM), X-ray photoelectron spectroscopy (XPS) and nitrogen adsorption-desorption isotherms. It was observed that the most active catalyst was a cavity-containing porous sample prepared by a solvothermal method with a relatively high surface area (55 m2 g−1) and constituted by flower-like aggregates with open cavities at the catalyst surface. This catalyst displayed superior performance (100% of toluene conversion at 325 °C using highly demanding conditions) and this performance can be maintained for several catalytic cycles. Interestingly, the porous iron oxides present not only a higher catalytic activity than the non-porous but also a higher specific activity per surface area. The high activity of this catalyst has been related to the possible synergistic effect of compositional, structural and microstructural features emphasizing the role of the surface area, the crystalline phase present, and the properties of the surface.

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Three-dimensionally ordered and wormhole-like mesoporous iron oxide catalysts highly active for the oxidation of acetone and methanol

Cited by 81 publications

References 35 publications

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

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

Catalytic destruction of chlorobenzene over mesoporous ACeOx (A=Co, Cu, Fe, Mn, or Zr) composites prepared by inorganic metal precursor spontaneous precipitation

Eco-Friendly Cavity-Containing Iron Oxides Prepared by Mild Routes as Very Efficient Catalysts for the Total Oxidation of VOCs

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Three-dimensionally ordered and wormhole-like mesoporous iron oxide catalysts highly active for the oxidation of acetone and methanol

Cited by 81 publications

References 35 publications

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

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

Catalytic destruction of chlorobenzene over mesoporous ACeOx (A=Co, Cu, Fe, Mn, or Zr) composites prepared by inorganic metal precursor spontaneous precipitation

Eco-Friendly Cavity-Containing Iron Oxides Prepared by Mild Routes as Very Efficient Catalysts for the Total Oxidation of VOCs

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

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