Vital roles of hydroxyl groups and gold oxidation states in Au/ZrO2 catalysts for 1,3-butadiene hydrogenation

Zhang, Xin; Shi, Hui; Xu, Bin

doi:10.1016/j.jcat.2011.01.002

Cited by 74 publications

(49 citation statements)

References 59 publications

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“…5 and 6). The high durability of gold catalysts in hydrogenation of ethyne at 357 K is in good agreement with results of Jia [28], Zhang [38], and Azizi [41]. For example, Azizi and co-workers investigated the hydrogenation of ethyne and the formation of carbonaceous deposits using Au/CeO 2 .…”

Section: Resultssupporting

confidence: 86%

“…Thus, Zhang reported that dehydroxylated Au/ ZrO 2 was inactive in semi-hydrogenation of 1,3-butadiene but became active after regeneration of the surface -M-O-M-groups by water treatment [38]. Hydroxyl groups on ZrO 2 were proposed to supply protons for hydrogenation and according to H/D exchange reactions between D 2 and the -OH groups occurred at above 323 K [38]. The specific surface of supports decreases in the row Al 2 O 3 >TiO 2 >ZnO >ZrO 2 , thus the concentration of hydroxyl groups in Au catalysts decreases during the transition from Al 2 O 3 to ZrO 2 .…”

Section: Resultsmentioning

confidence: 99%

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Sites for the selective hydrogenation of ethyne to ethene on supported NiO/Au catalysts

2012

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Au, NiO, and NiO/Au clusters of 2.5-16 nm, supported on Al 2 O 3 , ZrO 2 , TiO 2 , and ZnO, were studied in the purification of ethene feedstock from ethyne by hydrogenation at 357 K. The Au, NiO, and NiO/Au catalysts possessed 100 % selectivity to ethene. As the size of NiO clusters decreased from 7 to 3 nm, the turnover frequency (TOF) decreased from 812-1,023 to 276 h −1 . In contrast with NiO, Au activity increased with decreasing particle size. NiO/Au catalysts possessed higher stability and activity in comparison with Au and NiO catalysts. The synergistic gain on NiO/Au clusters (SG) calculated as TOF NiO/Au -TOF Au -TOF NiO was 1,466; 1,147; 563; and 569 h −1 for NiO/Au/Al 2 O 3, NiO/Au/TiO 2 , NiO/Au/ZnO, and NiO/Au/ ZrO 2 , respectively. The reasons of the observed catalytic trends and the origin of the most active and selective sites are discussed.

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Section: Resultssupporting

confidence: 86%

Section: Resultsmentioning

confidence: 99%

Sites for the selective hydrogenation of ethyne to ethene on supported NiO/Au catalysts

2012

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“…The lower binding energy peak is assigned to Zr 3d 5/2 , whereas that at higher BE side is due to Zr 3d 3/2 . The corresponding BE values for the two spin-orbit components in Zr 3d spectra indicate the presence of Zr 4+ ions [54]. The CO oxidation results of Au/C and Au/CZ samples as a function of reaction temperature are shown in Figure 10.…”

Section: Resultsmentioning

confidence: 94%

Enhanced Catalytic Activity of Supported Gold Catalysts for Oxidation of Noxious Environmental Pollutant CO

Saikia

Miah

Malakar

et al. 2015

Indian Journal of Materials Science

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Noble metal nanomaterials have attracted mounting research attention for applications in diverse fields of catalysis, biology, and nanotechnology. In the present study, we have undertaken a detailed investigation on synthesis, characterization, and catalytic activity studies for CO oxidation by nanogold catalysts supported over CeO 2 and CeO 2 -ZrO 2 (1 : 1 mole ratio). The support systems were prepared by modified, simple precipitation technique and the Au supported samples were synthesized using depositionprecipitation with urea method. The physicochemical characterization was performed by XRD, ICP-AES, BET surface area, FT-IR, UV-Vis DRS, Raman Spectroscopy, TEM, and XPS techniques. Au/CeO 2 catalyst showed more than 80% CO conversions at 30 ∘ C, whereas Au/CeO 2 -ZrO 2 exhibited ∼100% CO conversion at that temperature. The catalytic performance of Au catalysts is highly dependent on the nature of the support.

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“…금과 이산화지르코늄으로 구성된 물질들은 표면패턴화, 수소생산, 촉매제조, 그리고 태양광 전지 등의 여러 가지 분야들에 응용될 수 있는 가능성을 가지고 있다 [1][2][3][4][5][6]. 이 물질들은 빛에 의하여 태양에너 지 전환에 중요한 전자전송과정을 유도하는 여기상태로 전환되는데, 이 과정에서 물질의 활성도와 선택도는 구성물들의 분포에 따라 달 라진다 [7,8].…”

Section: 서 론unclassified

Surface Properties of Glutathione Layer Formed on Gold Surfaces Interacting with ZrO₂

Park

2014

Korean Chemical Engineering Research

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− It is investigated that that the physical properties of Glutathione layer formed on gold surfaces may make an effect on the distribution of either gold particle adsorbed to the ZrO 2 surface or vice versa with the adjustment of the electrostatic interactions. For the investigation, the atomic force microscope (AFM) was used to measure the surface forces between the surfaces as a function of the salt concentration and pH value. The forces were quantitatively analyzed with the Derjaguin-Landau-Verwey-Overbeek (DLVO) theory to estimate the surface potential and charge density of the surfaces for each condition of salt concentration and pH value. The estimated-value dependence on the salt concentration was described with the law of mass action, and the pH dependence was explained with the ionizable groups on the surface. The salt concentration dependence of the surface properties, found from the measurement at pH 4 and 8, was consistent with the prediction from the law. It was found that the Glutathione layer had higher values for the surface charge densities and potentials than the zirconium dioxide surfaces at pH 4 and 8, which may be attributed to the ionized-functional-groups of the Glutathione layer.

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Vital roles of hydroxyl groups and gold oxidation states in Au/ZrO2 catalysts for 1,3-butadiene hydrogenation

Cited by 74 publications

References 59 publications

Sites for the selective hydrogenation of ethyne to ethene on supported NiO/Au catalysts

Sites for the selective hydrogenation of ethyne to ethene on supported NiO/Au catalysts

Enhanced Catalytic Activity of Supported Gold Catalysts for Oxidation of Noxious Environmental Pollutant CO

Surface Properties of Glutathione Layer Formed on Gold Surfaces Interacting with ZrO₂

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Vital roles of hydroxyl groups and gold oxidation states in Au/ZrO2 catalysts for 1,3-butadiene hydrogenation

Cited by 74 publications

References 59 publications

Sites for the selective hydrogenation of ethyne to ethene on supported NiO/Au catalysts

Sites for the selective hydrogenation of ethyne to ethene on supported NiO/Au catalysts

Enhanced Catalytic Activity of Supported Gold Catalysts for Oxidation of Noxious Environmental Pollutant CO

Surface Properties of Glutathione Layer Formed on Gold Surfaces Interacting with ZrO2

Contact Info

Product

Resources

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Surface Properties of Glutathione Layer Formed on Gold Surfaces Interacting with ZrO₂