Synergism of the catalytic effect of nanosized gold-nickel catalysts in the reaction of selective acetylene hydrogenation to ethylene

Николаев, С. А.; Смирнов, В. В.; Vasil’kov, A. Yu.; Podshibikhin, V. L.

doi:10.1134/s0023158410030080

Cited by 48 publications

(35 citation statements)

References 4 publications

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“…23 The introduction of an addi tional metal also affects the charge redistribution on the particle surface. 21 Thus, the models developed for the adsorption of hy drocarbons of various composition and structure on the gold surface showed that the active adsorption sites are the most coordinatively unsaturated gold atoms situated on the peaks and edges of the cluster. If the cluster contains positively charged atoms, the energy of the hydrocarboncluster bond increases more considerably than for the dis tortion of the planar 2D structure.…”

Section: Resultsmentioning

confidence: 99%

“…21 According to the performed simulation, the most probable adsorption and catalytic centers are Au δ+ (0 < δ < 1), which can appear on the surface due to the interaction of a particle with the support or with the frag ments of organic molecules remaining on the surface at some methods of production. 22 The use of supports con taining surface Brönsted and/or Lewis acid sites favors an increase in these centers.…”

Section: Resultsmentioning

confidence: 99%

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Effect of the structure and charge of Au10 clusters on adsorption of hydrocarbons

et al. 2010

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The interaction of gold clusters Au 10 of different structural and charge states with various hydrocarbons was studied by the PBE density functional method. Saturated hydrocarbons interact weakly with the neutral cluster Au 10 , for charged Au 10 + the alkane-cluster bond energies increase threefold. Unsaturated hydrocarbons interact with cluster surface more strongly than saturated hydrocarbons, while coordination to the benzene ring is possible for aromatic compounds PhC 2 H, PhC 2 H 3 , and PhC 2 H 5 . The low coordinative gold atoms located on the peaks and edges of the cluster are the active adsorption site of the cluster. The appearance of a positive charge on the cluster leads to a greater increase in the hydrocarbon-gold cluster bond energy than the transition from the planar 2D structure to the three dimensional (3D) structure of the neutral cluster.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Effect of the structure and charge of Au10 clusters on adsorption of hydrocarbons

et al. 2010

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“…Gold-nickel bimetallic catalysts have shown enhanced catalytic properties for a number of reactions [1][2][3][4][5][6][7][8][9], such as steaming reforming of hydrocarbons [1,2], the water-gas shift reaction [3], and hydrodechlorination [4,5]. A MgAl 2 O 4 -supported Au-Ni catalyst maintained almost constant activity for the steam reforming of n-butane, whereas a monometallic Ni catalyst deactivated rapidly [1].…”

Section: Introductionmentioning

confidence: 99%

Silica-Supported Au–Ni Catalysts for the Dehydrogenation of Propane

Yan

Goodman

2012

Catal Lett

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Inspired by previous studies on model systems, a series of silica-supported Au-Ni catalysts were prepared and tested for the conversion of propane in the presence of hydrogen. The Au-Ni/SiO 2 catalysts were prepared by successive impregnation, i.e. Ni was deposited first followed by Au. TEM/EDX results confirmed the presence of bimetallic Au-Ni nanoparticles. The dehydrogenation of propane to propylene was observed on the Au-Ni bimetallic catalysts, whereas only hydrogenolysis products were observed on the monometallic Ni catalyst. The selectivity to propylene was found to increase monotonically with the Au loading. The results are in good agreement with the results on model catalysts.

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“…Nickel-gold bimetallic catalysts have been shown to have promising catalytic properties for a variety of reactions [1][2][3][4][5][6][7][8][9], such as steaming reforming of hydrocarbons [1,2], the water-gas shift reaction [3], hydrodechlorination [4,5] and selective hydrogenation of alkynes [6]. Besenbacher et al showed that the activity of a MgAl 2 O 4 -supported Ni-Au catalyst was almost constant for the steam reforming of n-butane, whereas a pure Ni catalyst deactivated rapidly [1].…”

Section: Introductionmentioning

confidence: 99%

Dehydrogenation of Propane to Propylene over Supported Model Ni–Au Catalysts

2012

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Hydrogenolysis and dehydrogenation of propane were studied over model nickel-gold catalysts. The supported model Ni-Au catalysts were prepared by depositing Ni and Au onto a planar silica film. Infrared reflection absorption spectroscopic data showed that isolated Ni sites appeared and became dominant on the surface with the addition of Au to Ni. For the conversion of propane in the presence of hydrogen, the dehydrogenation of propane to propylene was observed on the Ni-Au bimetallic catalysts, whereas only hydrogenolysis products were observed on the monometallic Ni catalyst. A correlation was found between the concentration of isolated Ni sites and the catalytic activity for propane dehydrogenation.

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Synergism of the catalytic effect of nanosized gold-nickel catalysts in the reaction of selective acetylene hydrogenation to ethylene

Cited by 48 publications

References 4 publications

Effect of the structure and charge of Au10 clusters on adsorption of hydrocarbons

Effect of the structure and charge of Au10 clusters on adsorption of hydrocarbons

Silica-Supported Au–Ni Catalysts for the Dehydrogenation of Propane

Dehydrogenation of Propane to Propylene over Supported Model Ni–Au Catalysts

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