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Nanoparticle Catalyst (nanoparticle + catalyst)

Distribution by Scientific Domains
Chemistry83%

Selected Abstracts

Efficient Aerobic Oxidation of Alcohols using a Hydrotalcite-Supported Gold Nanoparticle Catalyst

ADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 11-12 2009
Takato Mitsudome
Abstract Hydrotalcite-supported gold nanoparticles (Au/HT) were found to be a highly efficient heterogeneous catalyst for the aerobic oxidation of alcohols under mild reaction conditions (40,°C, in air). This catalyst system does not require any additives and is applicable to a wide range of alcohols, including less reactive cyclohexanol derivatives. This Au/HT catalyst could also function in the oxidation of 1-phenylethanol under neat conditions; the turnover number (TON) and turnover frequency (TOF) reached 200,000 and 8,300,h,1, respectively. These values are among the highest values compared to those of other reported catalyst systems at high conversion. Moreover, the Au/HT can be recovered by simple filtration and reused without any loss of its activity and selectivity. [source]

ChemInform Abstract: Recyclable Gold Nanoparticle Catalyst for the Aerobic Alcohol Oxidation and C,C Bond Forming Reaction Between Primary Alcohols and Ketones under Ambient Conditions.

CHEMINFORM, Issue 23 2009
Sungjin Kim
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source]

Recent Development of Active Nanoparticle Catalysts for Fuel Cell Reactions

ADVANCED FUNCTIONAL MATERIALS, Issue 8 2010
Vismadeb Mazumder
Abstract This review focuses on the recent advances in the synthesis of nanoparticle (NP) catalysts of Pt-, Pd- and Au-based NPs as well as composite NPs. First, new developments in the synthesis of single-component Pt, Pd and Au NPs are summarized. Then the chemistry used to make alloy and composite NP catalysts aiming to enhance their activity and durability for fuel cell reactions is outlined. The review next introduces the exciting new research push in developing CoN/C and FeN/C as non-Pt catalysts. Examples of size-, shape- and composition-dependent catalyses for oxygen reduction at cathode and formic acid oxidation at anode are highlighted to illustrate the potentials of the newly developed NP catalysts for fuel cell applications. [source]

Hydrodeoxygenation of Lignin-Derived Phenols into Alkanes by Using Nanoparticle Catalysts Combined with Brønsted Acidic Ionic Liquids,

ANGEWANDTE CHEMIE, Issue 32 2010
Ning Yan Dr.
Wertschöpfung im Tandem: Ein katalytisches System bestehend aus Metall-Nanopartikeln (NPs) und einer funktionalisierten Brønsted-sauren ionischen Flüssigkeit (IL) in einer nichtfunktionalisierten IL wird beschrieben (siehe Bild). Das System ist hoch effizient für die Umsetzung von Lignin abgeleiteter phenolischer Verbindungen zu Alkanen, wobei die Hydrierung und Dehydratisierung als Tandemprozess ablaufen. [source]

Palladium-Catalyzed Transformation of Renewable Oils into Diesel Components

ADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 11-12 2010
Junxing Han
Abstract A size-controlled palladium nanoparticle catalyst prepared by adsorption of colloidal palladium nanoparticles on barium sulfate is efficient and highly selective in transforming vegetable oils into diesel-like fuel. Preliminary kinetic investigations using model compounds indicated that decarboxylation of aliphatic esters on palladium in a hydrogen-rich atmosphere showed a zero-order rate. Hydrogen temperature-programmed desorption measurements revealed that the high-temperature desorption of hydrogen species might be the rate-determining step. [source]

Ionic Liquids-Based Catalysis with Solids: State of the Art

ADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 6 2009
Yanlong Gu
Abstract Topics related to ionic liquid (IL)-based catalysis with solids not only open new ways for studies of heterogeneous catalysts, but also minimize many of the negative effects that current ILs have encountered. This review evaluates the various examples in solid-based heterogeneous catalytic systems that have been developed with the aid of ILs. Catalysis over ready-made solid catalysts in the presence of ILs, immobilizations of homogeneous organic and organometallic catalysts with the concepts of supported ionic liquid phase catalysis, metal nanoparticles catalysts in ILs, catalysis over supported ILs as well as metal complexes and the preparation of solid catalysts by using ILs as solvents have been described. In several cases, detailed information on the performance concerning catalytic activity and recyclability is available. [source]