Supported gold/MOx catalysts for NO/H2 and CO/O2 reactions

Dekkers, Matthijn; Lippits, M.J.; Nieuwenhuys, B.E.

doi:10.1016/s0920-5861(99)00201-1

Cited by 115 publications

(52 citation statements)

References 39 publications

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“…Besides the frequency shift the absorption bands become narrower and more symmetrical. The frequency of the CO absorption bands on gold and copper can be assigned to CO adsorbed on metallic particles [13].…”

Section: Ftirmentioning

confidence: 99%

“…A DFT study [23] shows that gold and copper have a lower barrier for CO oxidation than for H 2 oxidation. Previously reported results show that ceria has a promoting effect on the activity of the Au/Al 2 O 3 catalyst in CO oxidation [13,24]. It was argued that the active oxygen is supplied by the ceria.…”

Section: Introductionmentioning

confidence: 99%

“…Highly dispersed gold on suitable metal oxides exhibits extraordinarily high activity in low-temperature CO oxidation [10][11][12][13][14]. In addition, several studies have indicated that the rate of CO oxidation over supported Au catalysts exceeds that of H 2 oxidation [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, gold is a promising catalyst for the preferential catalytic oxidation of CO (PROX) in the presence of H 2 in the temperature range up to 100°C. By promoting Au catalysts great improvements in activity can be obtained [13,15,16,18] and the temperature range of CO conversion can be enlarged. Recent studies have shown that also CuO mixed with ZnO [19] and CuO mixed with cerium oxide [20][21][22] are promising PROX catalysts.…”

Section: Introductionmentioning

confidence: 99%

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A comparative study of the effect of addition of CeO x and Li2O on γ-Al2O3 supported copper, silver and gold catalysts in the preferential oxidation of CO

2007

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In the study described in this paper we deposited gold, silver and copper on c-Al 2 O 3 as nanoparticles (<4 nm) and investigated the behavior of these nanoparticles in the preferential oxidation of CO in presence of H 2 . In addition, the effect of addition of CeO x and/or Li 2 O was investigated. All the three metals show preferential oxidation of CO at low temperatures. The oxides added to Au/c-Al 2 O 3 , Ag/c-Al 2 O 3 and Cu/c-Al 2 O 3 improve the catalytic performance of the gold, silver and copper. Interesting and synergistic effects were observed when both the CeO x and Li 2 O were added. Possible mechanisms are proposed.

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Section: Ftirmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A comparative study of the effect of addition of CeO x and Li2O on γ-Al2O3 supported copper, silver and gold catalysts in the preferential oxidation of CO

2007

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“…However, Au catalysts supported on reducible transition metal oxides exhibited very high activities. Perhaps, this resulted from synergistic effects between the gold nanoparticles and support material [2,8,10,14,15]. Therefore, gold catalysts supported on composite MO x /Al 2 O 3 supports seem to have the possibility to realize the commercialization of high-activity catalysts.…”

Section: Introductionmentioning

confidence: 99%

Influence of pretreatment conditions on low-temperature CO oxidation over Au/MOx/Al2O3 catalysts

Wang

Hao

Cheng³

et al. 2003

Journal of Molecular Catalysis A: Chemical

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Composite oxide MO x /Al 2 O 3 supported gold catalysts for low-temperature CO oxidation were prepared and investigated. The presence of transition metal oxide was proved to be beneficial to the improvement of catalytic performance of Au/Al 2 O 3 catalysts for low-temperature CO oxidation. Furthermore, the influence of various pretreatment conditions on Au/MO x /Al 2 O 3 catalysts was studied carefully. The image of TEM showed that gold catalyst with small gold particles only in the form of a fine dispersion exhibited highly catalytic activity. The XPS, Fourier transform infrared (FTIR) spectroscopy characterization results of Au/FeO x /Al 2 O 3 catalyst showed that gold catalysts having partially oxidized gold species have the best catalytic performance. One possible pathway for CO oxidation on Au/FeO x /Al 2 O 3 catalyst is that the CO adsorbed on gold particles reacts with adsorbed oxygen, which is possible to occur on oxygen vacancies on the support or at the metal-support interface.

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Gold Nanoparticles as Chemical Catalysts

Overbury

Dai

2005

Encyclopedia of Inorganic Chemistry

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Gold, often known as being chemically inert , has rich inorganic and organic chemistry. In particular, gold nanoparticles, either protected by organic ligands or supported on solid surfaces, have attracted wide attention for their applications in catalysis, electronics, nonlinear optics, and biology. In this article, we summarize some recent advances in the synthesis of supported gold catalysts from the perspective of inorganic materials chemistry. These advances include new methods used to load gold, to prepare functionalized supports, and to postdecorate supported gold catalysts. More recent advances in the use of nanoparticle supports and other ordered nanostructures in making supported gold catalysts are also highlighted, and a critical analysis of the status of the field is presented. From this review, it is hoped that the reader will get an impression that inorganic materials chemistry can contribute to the synthesis of novel gold catalysts with good catalytic performance.

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Supported gold/MOx catalysts for NO/H2 and CO/O2 reactions

Cited by 115 publications

References 39 publications

A comparative study of the effect of addition of CeO x and Li2O on γ-Al2O3 supported copper, silver and gold catalysts in the preferential oxidation of CO

A comparative study of the effect of addition of CeO x and Li2O on γ-Al2O3 supported copper, silver and gold catalysts in the preferential oxidation of CO

Influence of pretreatment conditions on low-temperature CO oxidation over Au/MOx/Al2O3 catalysts

Gold Nanoparticles as Chemical Catalysts

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