Comparative study of Au/ZrO2 catalysts in CO oxidation and 1,3-butadiene hydrogenation

Zhang, Xin; Shi, Hui; Xu, Bin

doi:10.1016/j.cattod.2007.02.016

Cited by 100 publications

(66 citation statements)

References 26 publications

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“…These results are in good agreement with the results of Zhang et al [45,46]. This group used Au/ZrO 2 to investigate the effects of Au 3+ /Au 0 ratio on 1,3-butadiene hydrogenation.…”

Section: The Nature Of Au Activation In Nio/au Clusterssupporting

confidence: 91%

“…This group used Au/ZrO 2 to investigate the effects of Au 3+ /Au 0 ratio on 1,3-butadiene hydrogenation. It was reported that metallic Au 0 atoms at the surface of the gold particles were not the only active catalytic sites and that isolated Au 3+ ions were the most active [45,46]. The enhanced activation of H 2 on charged gold could be explained by mechanism of Au n -H 2 formation.…”

Section: The Nature Of Au Activation In Nio/au Clustersmentioning

confidence: 98%

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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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“…These results are in good agreement with the results of Zhang et al [45,46]. This group used Au/ZrO 2 to investigate the effects of Au 3+ /Au 0 ratio on 1,3-butadiene hydrogenation.…”

Section: The Nature Of Au Activation In Nio/au Clusterssupporting

confidence: 91%

Section: The Nature Of Au Activation In Nio/au Clustersmentioning

confidence: 98%

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

2012

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“…ZrO 2 is an excellent support in the field of catalysis and has been successfully applied in many catalytic reaction systems because of its ideal chemical and mechanical stability [1][2][3]. However, fundamental studies on the roles of ZrO 2 in these reactions using modern surface science techniques are often hampered by charging problems because of the poor electrical conductivity of bulk ZrO 2 ; the band gap of ZrO 2 is approximately 5 eV [4].…”

mentioning

confidence: 99%

Epitaxial growth of ultrathin ZrO2(111) films on Pt(111)

et al. 2011

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Ordered epitaxial ZrO 2 films were grown on Pt(111) and characterized by low energy electron diffraction (LEED), synchrotron radiation photoemission spectroscopy (SRPES) and X-ray photoelectron spectroscopy (XPS). The films were prepared by vapor deposition of zirconium in an O 2 atmosphere followed by annealing under ultra high vacuum. At low coverages, the films grew as discontinuous two-dimentional islands with ordered structures. The size and structure of these islands were dependent on the coverage of ZrO 2 films. At coverage <0.5 monolayer (ML), ( )

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“…Zirconia was used also as a support and/or catalyst material with unique properties in a great variety * E-mail: rehamfattah2012@gmail.com of reactions. As a support, zirconia supported metal and metal oxides have been used in numerous catalytic reactions such as CO oxidation [10,11], water gas shift reaction [12,13] and selective hydrogenation of unsaturated organic compounds [14]. As an active catalyst component, zirconia has been used for catalytic reactions, such as alkene isomerization [15], alcohol dehydration [16] and hydrogenation and dehydrogenation of hydrocarbons [17].…”

Section: Introductionmentioning

confidence: 99%

Effects of thermal treatment and fluoride ion doping on surface and catalytic properties of NiO–ZrO₂catalysts

Fattah

Kiwaan

Ahmed

et al. 2016

Materials Science-Poland

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ZrO 2 and a series of NiO/ZrO 2 hydrogels (5 to 25 wt.% NiO) were co-precipitated with the aid of NaOH-Na 2 C 2 O 4 solution. Two fluorinated hydrogels were also prepared by wet impregnation method. The samples were calcined in the temperature range of 550 to 850 • C. The surface properties of the samples were determined using DTA, XRD and nitrogen adsorption at −196 • C. The conversion of isopropanol was tested using microcatalytic pulse technique. DTA measurements showed that the addition of nickel oxide to zirconia influences the phase transition of ZrO 2 . XRD revealed that the tetragonal phase was formed at T 650 • C, while a biphasic mixture was obtained at T 750 • C. No spinel structure was detected by both DTA and XRD techniques and only traces of cubic NiO were detected for the samples containing 15 wt.% nickel oxide and calcined at T 750 • C. Significant changes in texture, surface acidity and catalytic activity were found as a result of the effects of thermal treatment and chemical composition. Incorporation of fluoride ions greatly increased the surface acidity and consequently enhanced the dehydration activity. It has been found that dehydration activity is related to the amount of surface acidity while the dehydrogenation of this alcohol is sensitive to NiO content.

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Comparative study of Au/ZrO2 catalysts in CO oxidation and 1,3-butadiene hydrogenation

Cited by 100 publications

References 26 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

Epitaxial growth of ultrathin ZrO2(111) films on Pt(111)

Effects of thermal treatment and fluoride ion doping on surface and catalytic properties of NiO–ZrO₂catalysts

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Comparative study of Au/ZrO2 catalysts in CO oxidation and 1,3-butadiene hydrogenation

Cited by 100 publications

References 26 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

Epitaxial growth of ultrathin ZrO2(111) films on Pt(111)

Effects of thermal treatment and fluoride ion doping on surface and catalytic properties of NiO–ZrO2catalysts

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Effects of thermal treatment and fluoride ion doping on surface and catalytic properties of NiO–ZrO₂catalysts