Nanostructured iron oxide catalysts with gold for the oxidation of carbon monoxide

Carabineiro, Sónia A. C.; Bogdanchikova, Nina; Tavares, Pedro B.; Figueiredo, José L.

doi:10.1039/c2ra00724j

Cited by 76 publications

(49 citation statements)

References 105 publications

(240 reference statements)

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“…Increasing of Au loading to 0.5 and 1.0 wt.% resulted in the disappearance of the reduction peak at max = 723 K (reduction of Fe 2 O 3 to Fe 3 O 4 ). Carabineiro et al [40] reported similar results that Au supported Fe 2 O 3 catalysts showed two reduction peaks above 800 ∘ C, which could be due to the reduction of Fe 3 O 4 to FeO (or of FeO to Fe). The deposition of a larger amount of Au leads to the formation of agglomerated Au nanoparticles, which interact with Fe 2 O 3 leading to a shift in reduction temperature.…”

Section: Catalytic Oxidation Of Carbonmentioning

confidence: 66%

Low Temperature Oxidation of Carbon Monoxide over Mesoporous Au-Fe₂O₃Catalysts

Alshehri

Narasimharao

2017

Journal of Nanomaterials

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Low temperature active and stable mesoporous Au (0.1, 0.2, 0.5, and 1.0 wt.%) supported -Fe 2 O 3 catalysts were prepared via deposition-precipitation method. The H 2 -pretreated catalyst with 0.5 wt.% Au loading offered CO conversion of 100% at 323 K and showed continual activity for at least 120 h. X-ray diffraction and transmission electron microscopy analysis indicate that Au species were highly dispersed as nanoparticles (20-40 nm) on the surface of -Fe 2 O 3 support even after thermal treatment at 773 K. The N 2 -physisorption measurements show that the synthesized -Fe 2 O 3 support and Au-Fe 2 O 3 nanocomposites possessed mesopores with high specific surface area of about 158 m 2 g −1 . X-ray photoelectron spectroscopy and H 2 -TPR results reveal that the Au species exist in metallic and partially oxidized state due to strong interaction with the support. Effective Au-Fe 2 O 3 interaction resulted in a high activity for Au nanoparticles, locally generated by the thermal treatment at 773 K in air.

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Section: Catalytic Oxidation Of Carbonmentioning

confidence: 66%

Low Temperature Oxidation of Carbon Monoxide over Mesoporous Au-Fe₂O₃Catalysts

Alshehri

Narasimharao

2017

Journal of Nanomaterials

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“…The DIM method is similar to the traditional wetness impregnation, but it involves a second impregnation step with the addition of an aqueous solution of Na2CO3 [33,37,38]. First, the support was impregnated with an aqueous solution (5×10 -3 M) of HAuCl4.3H2O (Alfa Aesar) and then with an aqueous solution of Na2CO3 (10 -2 M), under constant ultrasonic stirring.…”

Section: Double Impregnation Methods (Dim)mentioning

confidence: 99%

Effect of the preparation method on the catalytic activity and stability of Au/Fe2O3 catalysts in the low-temperature water–gas shift reaction

Soria

Pérez

Carabineiro

et al. 2014

Applied Catalysis A: General

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The low temperature water-gas-shift reaction has been studied over a series of nanosized Au/Fe2O3 catalysts. The effect of the synthesis method on the catalytic activity has been analysed. A series of catalysts with different Au loadings has been prepared by different methods: Deposition-Precipitation (DP), Liquid Phase Reductive Deposition (LPRD) and Double Impregnation Method (DIM). The Au/Fe2O3 catalysts prepared by DP showed the highest CO conversion. The catalysts were characterised by hydrogen temperature programmed reduction (TPR-H2), high-resolution transmission electron microscopy (HRTEM), X-ray powder diffraction and X-ray photoelectron spectroscopy. TPR-H2 analysis revealed that gold promotes the reducibility of the Fe2O3 support, which is crucial in this redox reaction. HRTEM evidences a very good dispersion of gold over the iron support, with nanoparticles in the range 2.2-3.1 nm for the DP and LPRD series, and a negligible increase in the average particle size of the used samples. For the DIM series, much larger Au particles (~6.6 nm) were obtained.

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“…It has been well established that the presence of a shake-up peak at about 940-945 eV, and the Cu 2p3/2 binding energy at 933.0-933.8 eV, are two major XPS characteristics of CuO [12,18,40]. The characteristic peaks of Au 4f7/2 and Au 4f5/2 spin-orbital splitting photoelectrons are located at 84.0 and 87.5 eV (Figure 5e), which is characteristic for zero valent gold [41]. For catalysts, the presence of metallic Au might benefit the catalytic performance in the catalytic CO oxidation.…”

Section: Xps Spectramentioning

confidence: 99%

“…For catalysts, the presence of metallic Au might benefit the catalytic performance in the catalytic CO oxidation. The binding energy of oxidized gold species, which should be located at around 85.5 and 86.3 eV [41], has been not detected. The Au-content of Au/Bi 2 WO 6 -400: Au 1.30 wt % (300 • C), the Cu-content of CuO/Bi 2 WO 6 -400: Cu 5.10 wt %, and Cu-content and Au-content of Au-CuO/Bi 2 WO 6 -400 (Cu 4.85 wt %, Au 0.438 wt %) detected by XPS, is listed in Tables S1-S3, respectively.…”

Section: Xps Spectramentioning

confidence: 99%

Flower-Like Au–CuO/Bi2WO6 Microsphere Catalysts: Synthesis, Characterization, and Their Catalytic Performances for CO Oxidation

et al. 2017

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Abstract:The flower-like Bi 2 WO 6 microsphere was synthesized through a simple hydrothermal route, and three catalysts, Au/Bi 2 WO 6 , CuO/Bi 2 WO 6 , and Au-CuO/Bi 2 WO 6 , were prepared by a deposition-precipitation method. The morphology and structure of the catalysts were characterized by X-ray powder diffraction, surface area analyzer, inductively coupled plasma optical emission spectrometer, scanning electron microscope, transmission electron microscopy, UV/Vis spectrometer, as well as X-ray photoelectron spectroscopy. Their catalytic performances in catalytic CO oxidation were evaluated. For Au/Bi 2 WO 6 and CuO/Bi 2 WO 6 , Au and CuO nanoparticles highly dispersed on Bi 2 WO 6 are 3 and 10 nm, respectively, in average size. For Au-CuO/Bi 2 WO 6 , a part of the Au nanoparticles (Au NPs) strongly adheres to the CuO, due to the strong interaction between Au NPs and CuO, which has a positive effect on catalytic activity of Au-CuO/Bi 2 WO 6 . Au-CuO/Bi 2 WO 6 can convert CO into CO 2 completely at 40 • C, as the contents of Au and Cu are 0.438 wt % and 4.85 wt %, respectively.

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Nanostructured iron oxide catalysts with gold for the oxidation of carbon monoxide

Cited by 76 publications

References 105 publications

Low Temperature Oxidation of Carbon Monoxide over Mesoporous Au-Fe₂O₃Catalysts

Low Temperature Oxidation of Carbon Monoxide over Mesoporous Au-Fe₂O₃Catalysts

Effect of the preparation method on the catalytic activity and stability of Au/Fe2O3 catalysts in the low-temperature water–gas shift reaction

Flower-Like Au–CuO/Bi2WO6 Microsphere Catalysts: Synthesis, Characterization, and Their Catalytic Performances for CO Oxidation

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Nanostructured iron oxide catalysts with gold for the oxidation of carbon monoxide

Cited by 76 publications

References 105 publications

Low Temperature Oxidation of Carbon Monoxide over Mesoporous Au-Fe2O3Catalysts

Low Temperature Oxidation of Carbon Monoxide over Mesoporous Au-Fe2O3Catalysts

Effect of the preparation method on the catalytic activity and stability of Au/Fe2O3 catalysts in the low-temperature water–gas shift reaction

Flower-Like Au–CuO/Bi2WO6 Microsphere Catalysts: Synthesis, Characterization, and Their Catalytic Performances for CO Oxidation

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Low Temperature Oxidation of Carbon Monoxide over Mesoporous Au-Fe₂O₃Catalysts

Low Temperature Oxidation of Carbon Monoxide over Mesoporous Au-Fe₂O₃Catalysts