Ru Nanoparticles Immobilized on Montmorillonite by Ionic Liquids: A Highly Efficient Heterogeneous Catalyst for the Hydrogenation of Benzene

Miao, Shiding; Liu, Zhimin; Han, Buxing; Huang, Jun; Sun, Zhenyu; Zhang, Jianling; Jiang, Tao

doi:10.1002/anie.200502632

Cited by 194 publications

(130 citation statements)

References 43 publications

Supporting

Mentioning

126

Contrasting

Order By: Relevance

“…[181][182][183][184][185][186][187][188] For instance, Na-montmorillonite was ion-exchanged with 1,1,3,3-tetramethylguanidinium trifluoroacetate, RuCl 3 was loaded onto the composite, and H 2 was used to reduce the catalyst. [181] The resulting Ru catalyst showed good performance in the hydrogenation of benzene. In another study, Rh nanoparticles were supported on attapulgite (a natural mineral) using a similar procedure, and were used in the hydrogenation of cyclohexene.…”

Section: Preparation Of Supported Catalystsmentioning

confidence: 99%

Preparation of Inorganic Materials Using Ionic Liquids

2009

View full text Add to dashboard Cite

Conventional synthesis of inorganic materials relies heavily on water and organic solvents. Alternatively, the synthesis of inorganic materials using, or in the presence of, ionic liquids represents a burgeoning direction in materials chemistry. Use of ionic liquids in solvent extraction and organic catalysis has been extensively studied, but their use in inorganic synthesis has just begun. Ionic liquids are a family of non-conventional molten salts that can act as templates and precursors to inorganic materials, as well as solvents. They offer many advantages, such as negligible vapor pressures, wide liquidus ranges, good thermal stability, tunable solubility for both organic and inorganic molecules, and much synthetic flexibility. In this Review, the use of ionic liquids in the preparation of several categories of inorganic and hybrid materials (i.e., metal structures, non-metal elements, silicas, organosilicas, metal oxides, metal chalcogenides, metal salts, open-framework structures, ionic liquid-functionalized materials, and supported ionic liquids) is summarized. The status quo of the research field is assessed, and some future perspectives are furnished.

show abstract

Section: Preparation Of Supported Catalystsmentioning

confidence: 99%

Preparation of Inorganic Materials Using Ionic Liquids

2009

View full text Add to dashboard Cite

show abstract

“…These materials show high catalytic activity for the hydrogenation of olefins [5] and aromatic compounds (catalytic turnover frequency up to 7000 h -1 ) [8]. Ruthenium nanoparticles intercalated in montmorillonite were also found to efficiently catalyze the hydrogenation of benzene (110°C), the catalytic activity (4000 h -1 ) being somewhat lower than the one of hectorite-supported ruthenium nanoparticles [9]. In this paper, we report on the influence of solvent and reducing agent on the shape and size of the ruthenium nanoparticles intercalated in hectorite and on the catalytic performance of the materials obtained for the hydrogenation of benzene.…”

Section: Introductionmentioning

confidence: 99%

Shape- and Size-Selective Preparation of Hectorite-Supported Ruthenium Nanoparticles for the Catalytic Hydrogenation of Benzene

et al. 2009

View full text Add to dashboard Cite

The cationic organometallic aqua complexes formed by hydrolysis of [(C 6 H 6 ) 2 RuCl 2 ] 2 in water, mainly [(C 6 H 6 2? , intercalate into white sodium hectorite, replacing the sodium cations between the anionic silicate layers. The yellow hectorite thus obtained reacts in water with molecular hydrogen (50 bar, 100°C) to give a dark suspension containing a black hectorite in which large hexagonally shaped ruthenium nanoparticles (20-50 nm) are intercalated between the anionic silicate layers, the charges of which being balanced by hydronium cations. If the reduction with molecular hydrogen (50 bar, 100°C) is carried out in various alcohols, spherical ruthenium nanoparticles of smaller size (3-38 nm depending on the alcohol) are obtained. In alcohols other than methanol, the reduction also works without H 2 under reflux conditions, the alcohol itself being the reducing agent; the ruthenium nanoparticles obtained in this case are spherical and small (2-9 nm) but tend to aggregate to form clusters of nanoparticles. Whereas the ruthenium nanoparticles prepared by reduction of the yellow hectorite in refluxing alcohols without hydrogen pressure are almost inactive, the nanoparticles formed by hydrogen reduction catalyze the hydrogenation of benzene to give cyclohexane under mild conditions (50°C) with turnover frequencies up to 6500 catalytic cycles per hour, the best solvent being ethanol.Dedicated to Professor C. N. R. Rao, pioneer of nanocluster chemistry, on the occasion of his 75th birthday.

show abstract

“…Recently, Miao et al [3] described a method for preparing Ru catalysts by immobilizing Ru nanoparticles on montmorillonite (MMT) clay with the assistance of ionic liquids. While the Ru/ MMT catalyst exhibited excellent activity for the hydrogenation of benzene, the Ru nanoparticles were found to aggregate to form larger particles after several reaction runs.…”

Section: Introductionmentioning

confidence: 99%

Sandwiched Ruthenium/Carbon Nanostructures for Highly Active Heterogeneous Hydrogenation

Lee

et al. 2007

Adv Funct Materials

104

View full text Add to dashboard Cite

The immobilization of metal nanoparticles in the framework of porous carbon for heterogeneous catalysis may avoid particle aggregation, movement, and leaching, thus leading to a high catalyst efficiency. In this Full Paper, an approach to prepare Ru nanoparticles incorporated into the pore walls of porous carbon to form a sandwiched Ru/C nanostructure for heterogeneous hydrogenation is demonstrated. Physical adsorption of nitrogen, X‐ray diffraction, thermogravimetric analysis, field‐emission transmission electron microscopy, field‐emission scanning electron microscopy, and energy dispersive X‐ray spectroscopy techniques are employed to study the structure and morphology of the catalysts. Catalytic results show that the Ru nanoparticles sandwiched in the pore walls of porous carbon display a remarkably high activity and stability in the hydrogenation of benzene. An enhanced hydrogen spillover effect is believed to play a significant role in the hydrogenation reaction because of the intimate interfacial contact between Ru nanoparticles and the carbon support. The catalyst system described in this work may offer a new concept for optimizing catalyst nanostructures.

show abstract

Ru Nanoparticles Immobilized on Montmorillonite by Ionic Liquids: A Highly Efficient Heterogeneous Catalyst for the Hydrogenation of Benzene

Cited by 194 publications

References 43 publications

Preparation of Inorganic Materials Using Ionic Liquids

Preparation of Inorganic Materials Using Ionic Liquids

Shape- and Size-Selective Preparation of Hectorite-Supported Ruthenium Nanoparticles for the Catalytic Hydrogenation of Benzene

Sandwiched Ruthenium/Carbon Nanostructures for Highly Active Heterogeneous Hydrogenation

Contact Info

Product

Resources

About