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Wang, Gui Ying; Lian, Hong; Zhang, Wen Xiang; Jiang, Da Zhen; Wu, Tonghao

doi:10.1023/a:1016026405985

Cited by 60 publications

(33 citation statements)

References 18 publications

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“…It is important to note that the higher the Au loading in the DP series, the higher is the shift of this peak towards lower temperatures with respect to that of the Fe2O3 support ( Figure 6). This trend is in agreement with previous studies of Au/Fe2O3 catalysts reported in literature [23,27,55,56] where this effect was explained in terms of the activation (adsorptiondissociation) of molecular hydrogen on the gold metal and the spillover of the atomic hydrogen to the -Fe2O3 material [23,27,57,58], and is supported by the fact that the Au-particle size is independent of the metal loading ( Figure 12). …”

Section: Effect Of Gold On the Reducibility Of The -Fe2o3 Supportsupporting

confidence: 93%

“…The reduction of bulk gold oxide was reported as two sharp reduction peaks at 195 °C and at 232 °C [53]. Some authors observed the reduction of gold oxide in the 100-150 ºC range for Au/Fe2O3 samples prepared by the co-precipitation method [48,58,59]. They claimed that the peak of reduction of AuxOy species appears at lower temperature, with respect to bulk gold oxide, as a consequence of a much higher surface area of Au/Fe2O3 catalysts [48,60].…”

Section: Effect Of Gold On the Reducibility Of The -Fe2o3 Supportmentioning

confidence: 99%

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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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Section: Effect Of Gold On the Reducibility Of The -Fe2o3 Supportsupporting

confidence: 93%

Section: Effect Of Gold On the Reducibility Of The -Fe2o3 Supportmentioning

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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“…Stable carbonate intermediates have been observed on the surface in several IR studies of real catalysts (191,358,375,377,403,421,422,430,473). Originally thought to be a key part of the mechanism (191,473), the prevailing view today is that CO3 is a spectator species in the reaction (3,4,496) and that it can even act to deactivate the catalyst by blocking reaction sites (382,467,(500)(501)(502)(503). However, the transition could very well be a non-symmetrical carbonate such that preferential cleavage of the O-OCO bond is conceivable as has been proposed by both theorists and experimentalists (226,247,474).…”

Section: 2mentioning

confidence: 99%

Surface chemistry of catalysis by gold

et al. 2004

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IntroductionGold has long been regarded as an "inert" surface and bulk gold surfaces do not chemisorb many molecules easily. However, in the last decade, largely through the efforts of Masatake Haruta, gold particles, particularly those below 5 nm in size, have begun to garner attention for unique catalytic properties (1-8). In recent years, supported gold particles have been shown to be effective as catalysts for low temperature CO oxidation (9), selective oxidation of propene to propene oxide (10), water gas shift (11), NO reduction (12), selective hydrogenation of acetylene (or butadiene) (13)

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“…However, high prices and deactivation drawbacks of these metal catalysts limit applications in many fields [5,[7][8][9]. The deactivation was mainly originated from aggregation of active metal, coverage of carbonates and competitive adsorption between CO and moisture [10,11]. In contrast, much lower cost Pd catalyst showed comparable activity and long lifespan for CO oxidation at low temperatures [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Preparation of Palladium Supported on Ferric Oxide Nano-catalysts for Carbon Monoxide Oxidation in Low Temperature

Wang

Zhao

et al. 2014

Nano-Micro Lett.

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Catalytic property of Pd/Fe2O3 catalysts on carbon monoxide (CO) oxidation at low temperature were investigated in this paper. Both the as-prepared and H2-pretreated Pd/Fe2O3 catalysts show catalytic performances on CO oxidation. The CO was completely converted at 333 K for the as-prepared sample, whereas at 313 K for H2-pretreated Pd/Fe2O3-573 catalyst. The catalytic performance of the Pd/Fe2O3 catalyst decreases with increased calcination temperature. This may be due to the increased crystallinity of the support and decreased metal-support interaction. Progressive deactivation of the catalysts during long-time reaction was associated with the formation of carbonates on the catalyst surface that inhibits CO activation or intermediate transformation.

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Cited by 60 publications

References 18 publications

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

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

Surface chemistry of catalysis by gold

Preparation of Palladium Supported on Ferric Oxide Nano-catalysts for Carbon Monoxide Oxidation in Low Temperature

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