NDLI: Synthesis of sinter-resistant Au@silica catalysts derived from Au<sub>25</sub> clusters

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Crude oil to chemicals: light olefins from crude oil

Kinetic evidence: the rate-determining step for ammonia synthesis over electride-supported Ru catalysts is no longer the nitrogen dissociation step

Is iron nitride or carbide highly active for oxygen reduction reaction in acidic medium?

Kinetics study of the Ru/C-catalysed hydrogenolysis of polyols – insight into the interactions with the metal surface

Engineering of ZSM-5 zeolite crystals for enhanced lifetime in the production of light olefins via 2-methyl-2-butene cracking

CO oxidation on Rh-doped hexadecagold clusters

Synthesis of cyclic organic carbonates via catalytic oxidative carboxylation of olefins in flow reactors

A mechanistic study of the Lewis acid–Brønsted base–Brønsted acid catalysed asymmetric Michael addition of diethyl malonate to cyclohexenone

Ethene hydrogenation vs. dimerization over a faujasite-supported [Rh(C₂H₄)₂] complex. A computational study of mechanism

Tetronics/cyclodextrin-based hydrogels as catalyst-containing media for the hydroformylation of higher olefins

Z-scheme CdS–Au–BiVO₄ with enhanced photocatalytic activity for organic contaminant decomposition

Sulfur-tolerant BaO/ZrO₂/TiO₂/Al₂O₃ quaternary mixed oxides for deNO_X catalysis

Low-temperature H₂-plasma-assisted NO_x storage and reduction over a combined Pt/Ba/Al and LaMnFe catalyst

Role of lanthanum species in improving the photocatalytic activity of titanium dioxide

Highly active and selective binary MgO–SiO₂ catalysts for the production of 1,3-butadiene from ethanol

Effect of hierarchical porosity in Beta zeolites on the Beckmann rearrangement of oximes

New insights into the support morphology-dependent ammonia synthesis activity of Ru/CeO₂ catalysts

Ethanol gas-phase ammoxidation to acetonitrile: the reactivity of supported vanadium oxide catalysts

Catalytic oxidation of benzene over ruthenium–cobalt bimetallic catalysts and study of its mechanism

Highly selective oxidation of cyclohexene to 2-cyclohexene-1-one over polyoxometalate/metal–organic framework hybrids with greatly improved performances

Influence of the lanthanide(iii) ion in {[Cu₃Ln₂(oda)₆(H₂O)₆]·nH₂O}_n (Ln^III: La, Gd, Yb) catalysts on the heterogeneous oxidation of olefins

Hydrothermal synthesis of a layered-type W–Ti–O mixed metal oxide and its solid acid activity

The mechanism of H₂ and H₂O desorption from bridging hydroxyls of a TiO₂(110) surface

Organic-free synthesis of {001} facet dominated BiOBr nanosheets for selective photoreduction of CO₂ to CO

Synthesis of sinter-resistant Au@silica catalysts derived from Au₂₅ clusters

Hydrodeoxygenation of gamma-valerolactone on transition metal phosphide catalysts

Water oxidation mediated by ruthenium oxide nanoparticles supported on siliceous mesocellular foam

Consequences of secondary zeolite growth on catalytic performance in DMTO studied over DDR and CHA

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Synthesis of sinter-resistant Au@silica catalysts derived from Au₂₅ clusters

Content Provider	Royal Society of Chemistry (RSC)
Author	Shivhare, Atal Sudheeshkumar, V. Scott, Robert W. J.
Copyright Year	2017
Abstract	Gold clusters exhibit remarkable catalytic activity for many reactions such as carbon monoxide oxidation, alcohol, alkene, and hydrocarbon oxidations, and reduction reactions at low temperatures. However, several previous studies show that Au clusters undergo problematic sintering at temperatures above 250 °C, which makes them unsuitable catalysts for high-temperature oxidation reactions. Here we report the coating of Au25(11-MUA)18 clusters (where 11-MUA = mercaptoundecanoic acid) by silica to produce sinter-resistant Au@SiO2 catalysts. The structure of the resulting materials before and after calcination at temperatures up to 650 °C was followed by TEM and extended X-ray absorption fine structure spectroscopy (EXAFS) analyses, which showed that the Au@SiO2 catalysts created were much more stable to sintering compared to control materials; with average particles sizes of 2.2 nm after calcination at 250 °C and just over 3 nm after calcination at 650 °C. In addition, we explored the activity of the resulting materials for the 4-nitrophenol reduction and styrene epoxidation reactions; results clearly showed that the Au surfaces are accessible for reactants and that the kinetics of 4-nitrophenol reduction was directly related to the dispersion of the Au particles, as measured via the first shell Au–Au coordination numbers by EXAFS. Styrene epoxidation results show that the Au@SiO2 materials have excellent activity and recyclability.
Starting Page	272
Ending Page	280
Page Count	9
File Format	HTM / HTML PDF
ISSN	20444753
Volume Number	7
Issue Number	1
Journal	Catalysis Science & Technology
DOI	10.1039/c6cy01822j
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Spectroscopy Extended X-ray absorption fine structure Dispersion relation Calcination EXAFS Silicon dioxide 4-Nitrophenol Alkene Transmission electron microscopy Carboxylic acid Sintering Styrene Epoxide Carbon monoxide
Content Type	Text
Resource Type	Article
Subject	Catalysis

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Hierarchical structures based on gold nanoparticles embedded into hollow ceria spheres and mesoporous silica layers with high catalytic activity and stability

Highly active and selective Ti-incorporated porous silica catalysts derived from grafting of titanium(iv)acetylacetonate

Characterisation of oxide-supported alkene conversion catalysts using X-ray absorption spectroscopy

Au nanoparticle-embedded SiO₂–Au@SiO₂ catalysts with improved catalytic activity, enhanced stability to metal sintering and excellent recyclability

Highly active and sinter-resistant Pd-nanoparticle catalysts encapsulated in silica.

In situ assembly of well-dispersed Ni nanoparticles on silica nanotubes and excellent catalytic activity in 4-nitrophenol reduction

UV aerosol synthesis: a one-step route to silica, organic-silica and surfactant/silica nanostructured materials

Silica-supported isolated gallium sites as highly active, selective and stable propane dehydrogenation catalysts

Catalysis of TBHP oxidation of styrene and diphenylmethane by a supported cobalt(III)-oxo cluster

Synthesis of sinter-resistant Au@silica catalysts derived from Au₂₅ clusters

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