Research on unsupported nanoporous gold catalyst for CO oxidation

Xu, Caixia; Xu, Xin; Su, Jixin; Ding, Yi

doi:10.1016/j.jcat.2007.09.016

Cited by 167 publications

(108 citation statements)

References 41 publications

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“…Nanoporous gold (NPG), which was synthesized by dealloying method, could be regarded as another inversely supported gold system [95]. Applying NPG to catalytic reactions was initially claimed as a milestone in studying unsupported ''pure'' gold catalysts when Zielasek et al [96] and Xu et al [97,98] first applied NPG to CO oxidation reaction. However, it was then found there were traces of Ag residue after leaching Au-Ag alloy to make the NPG [96,97].…”

Section: Inversely Rmo Supported Gold Catalystsmentioning

confidence: 99%

Catalysis by gold: New insights into the support effect

et al. 2013

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Section: Inversely Rmo Supported Gold Catalystsmentioning

confidence: 99%

Catalysis by gold: New insights into the support effect

et al. 2013

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“…From the literature, it seems clear that the low coordinated gold atoms have to have a central role in the catalysis as is indicated by the fact that high dispersed gold nanoparticles catalyze the CO oxidation or by the fact that nanoparticles with diameters <2 nm catalyze the CO oxidation at low temperature and also by the fact that the nanoporous gold activity for this reaction depends on the number and size of the pores in the gold catalysts [1,[5][6][7][8][9]. Following these experimental evidences a series of theoretical works tried to clarify the role of the low coordinated gold atoms in the CO oxidation, i.e., they aimed to understand the reaction mechanism for the CO oxidation on gold.…”

Section: Resultsmentioning

confidence: 99%

“…On the other hand, it was found that gold cations supported on mordenite are inactive for the CO oxidation, being the reaction catalyzed at low temperature by gold clusters (diameter <2 nm) and at high temperature by gold nanoparticles [5]. Furthermore, unsupported gold may exhibit high catalytic activity for CO oxidation; this activity depends on its intrinsic structure (number and size of pores at nanometer scale), conferring a three-dimensional spongy morphology to the catalytic system [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Catalytic Reactions on Model Gold Surfaces: Effect of Surface Steps and of Surface Doping

et al. 2011

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Abstract:The adsorption energies and the activation energy barriers for a series of reactions catalyzed by gold surfaces and obtained theoretically through density functional theory (DFT) based calculations were considered to clarify the role of the low coordinated gold atoms and the role of doping in the catalytic activity of gold. The effect of the surface steps was introduced by comparison of the activation energy barriers and of the adsorption energies on flat gold surfaces such as the Au(111) surface with those on stepped surfaces such as the Au(321) or the Au(110) surfaces. It is concluded that the presence of low coordinated atoms on the latter surfaces increases the adsorption energies of the reactants and decreases the activation energy barriers. Furthermore, the increasing of the adsorption energy of the reaction products can lead to lower overall reaction rates in the presence of low gold coordinated atoms due to desorption limitations. On the other hand, the effect of doping gold surfaces with other transition metal atoms was analyzed using the dissociation reaction of molecular oxygen as a test case. The calculations showed that increasing the silver content in some gold surfaces was related to a considerable increment of the reactivity of bimetallic systems toward the oxygen dissociation. Importantly, that increment in the reactivity was enhanced by the presence of low coordinated atoms in the catalytic surface models considered.

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“…As some papers report that unsupported clusters may interact strongly with O 2 and even catalyze CO oxidation [26][27][28][29], we also include calculations on a gold cluster. We confirm that O 2 does not dissociate on a flat surface or even the stepped, relatively reactive (310) surface of gold that we used in previous work [30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Two Gold Surfaces and a Cluster with Remarkable Reactivity for CO Oxidation, a Density Functional Theory Study

et al. 2011

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We calculate the energetics of CO oxidation on extended surfaces of particular structures chosen to maximize their reactivity towards either O 2 dissociation, after which CO ? O to CO 2 is a facile reaction, or to CO 2 from molecular O 2 and CO. We identified two configurations of Au atoms for which the energetics of these reactions are feasible. A site consisting of four Au atoms in a square geometry appears well suited for dissociating oxygen.A Au 38 cluster exposing this site provides the most favourable energetics for the CO oxidation.

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Research on unsupported nanoporous gold catalyst for CO oxidation

Cited by 167 publications

References 41 publications

Catalysis by gold: New insights into the support effect

Catalysis by gold: New insights into the support effect

Catalytic Reactions on Model Gold Surfaces: Effect of Surface Steps and of Surface Doping

Two Gold Surfaces and a Cluster with Remarkable Reactivity for CO Oxidation, a Density Functional Theory Study

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