ChemCatChem

Cover image for Vol. 1 Issue 2

October 5, 2009

Volume 1, Issue 2

Pages 177–327

  1. Cover Picture

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      Cover Picture: Alumina-Supported Ni–Au: Surface Synergistic Effects in Catalytic Hydrodechlorination (ChemCatChem 2/2009) (page 177)

      Mark A. Keane, Santiago Gómez-Quero, Fernando Cárdenas-Lizana and Wenqin Shen

      Version of Record online: 28 SEP 2009 | DOI: 10.1002/cctc.200990005

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      The cover picture shows the surface reaction of hydrogen with 2,4-dichlorophenol on an alumina-supported Au–Ni bimetallic catalyst. In their full paper on pp. 270 ff., M.A. Keane et al. describe the preparation of the Au–Ni/Al2O3 catalyst by reductive deposition of Au onto Ni. Catalyst testing and surface characterisation have established that Au–Ni synergy leads to a more effective cleavage of the C[BOND]Cl bonds. Enhanced dechlorination is associated with clusters bearing a uniform Au/Ni composition. This catalytic system facilitates the sustainable detoxification and recycling of haloarenes.

  2. Graphical Abstract

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  3. News

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  4. Reviews

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    1. Catalytic Technology for Carbon Dioxide Reforming of Methane to Synthesis Gas (pages 192–208)

      Mun-Sing Fan, Ahmad Zuhairi Abdullah and Subhash Bhatia

      Version of Record online: 10 SEP 2009 | DOI: 10.1002/cctc.200900025

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      High and dry: The catalytic reaction between carbon dioxide and methane, the dry reforming reaction, is an alternative route to traditional steam reforming for the production of synthesis gas. Synthesis gas is used for the production of many important chemicals and intermediates besides liquid fuel using Fischer–Tropsch process. The catalyst plays an important role in this reaction to obtain the right H2/CO ratio in the synthesis gas.

    2. Selective Catalytic Hydrogenation of Functionalized Nitroarenes: An Update (pages 210–221)

      Hans-Ulrich Blaser, Heinz Steiner and Martin Studer

      Version of Record online: 10 SEP 2009 | DOI: 10.1002/cctc.200900129

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      Reducible complexity: Much progress has been made in the last decade in selective catalytic hydrogenation of nitroarenes in the presence of other reducible groups. This review article describes the performance of various catalyst types, including modified supported Pt, Ru, and Ni catalysts, colloidal Pt catalysts, and supported Au and Ag catalysts, in this chemoselective reduction.

  5. Minireview

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    1. Selected Thoughts on Chiral Crystals, Chiral Surfaces, and Asymmetric Heterogeneous Catalysis (pages 223–231)

      Kenneth D. M. Harris and Sir John Meurig Thomas

      Version of Record online: 18 SEP 2009 | DOI: 10.1002/cctc.200900181

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      The chiral mesoporous zeolite ITQ-37 is known to catalyze the acetalization of aldehydes but, to date, no asymmetric heterogeneously catalyzed reactions have been developed that exploit the zeolite's chirality. This Minireview explores reasons for the lack of enantioselective applications for chiral zeolites and, with reference to ITQ-37, discusses the design of chiral solids to catalyze enantioselective transformations.

  6. Highlight

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      Expanding the Substrate Scope for Metal-Catalyzed Asymmetric Carbon–Boron Bond Formation (pages 233–235)

      Patrick J. Guiry

      Version of Record online: 11 JUL 2009 | DOI: 10.1002/cctc.200900132

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      Metal-catalyzed hydroboration is summarized with an emphasis on the importance of the metal, the boron source and the ligand for high levels of regio- and stereoselectivity with a range of substrates. A recent report by Hoveyda, addressing the highly selective reaction of disubstituted alkenes for the preparation of regioisomers not accessible through existing methods, is highlighted.

  7. Communications

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      Homogeneous Chiral Nickel-Catalyzed Asymmetric Hydrogenation of Substituted Aromatic α-Aminoketone Hydrochlorides through Dynamic Kinetic Resolution (pages 237–240)

      Takuya Hibino, Kazuishi Makino, Takaya Sugiyama and Yasumasa Hamada

      Version of Record online: 2 SEP 2009 | DOI: 10.1002/cctc.200900084

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      Vive la résolution: Homogeneous chiral nickel complexes catalyze the asymmetric hydrogenation of substituted aromatic α-aminoketone hydrochlorides through dynamic kinetic resolution to afford medicinally important β-aminoalcohols with excellent diastereo- and enantioselectivities.

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      Novel Basic Mesoporous Catalysts for the Friedländer Reaction from 2-Aminoaryl Ketones: Quinolin-2(1H)-ones versus Quinolines (pages 241–243)

      Fernando Domínguez-Fernández, Jesús López-Sanz, Elena Pérez-Mayoral, David Bek, Rosa M. Martín-Aranda, Antonio J. López-Peinado and Jiri Čejka

      Version of Record online: 11 SEP 2009 | DOI: 10.1002/cctc.200900097

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      Fried donuts: Modified molecular sieves, with different acid/base properties and composition are tested, as catalysts for the Friedländer reaction of o-aminoaryl ketones. o-Aminoaryl ketones undergo annulation with ethyl acetoacetate catalyzed by basic molecular sieves. Amino-grafted MCM-41 materials are the first reported efficient catalyst for this reaction.

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      A Single Catalyst for Sequential Reactions: Dual Homogeneous and Heterogeneous Behavior of Palladium Nanoparticles in Solution (pages 244–246)

      Susanna Jansat, Jérôme Durand, Isabelle Favier, François Malbosc, Christian Pradel, Emmanuelle Teuma and Montserrat Gómez

      Version of Record online: 14 JUL 2009 | DOI: 10.1002/cctc.200900127

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      One becomes two: Palladium nanoparticles stabilized by ionic liquids are used as the sole catalytic precursors for sequential Heck and hydrogenation processes. The dual role of these systems, which act as both a heterogeneous catalyst and also as a reservoir of catalytically active molecular species, is investigated.

  8. Full Papers

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      New Nanocrystalline Cu/MnOx Catalysts Prepared from Supercritical Antisolvent Precipitation (pages 247–251)

      Zi-Rong Tang, Christopher D. Jones, James K. W. Aldridge, Thomas E. Davies, Jonathan K. Bartley, Albert F. Carley, Stuart H. Taylor, Mathieu Allix, Calum Dickinson, Matthew J. Rosseinsky, John B. Claridge, Zhongling Xu, Mandy J. Crudace and Graham J. Hutchings

      Version of Record online: 8 SEP 2009 | DOI: 10.1002/cctc.200900195

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      Supercritical CO2is used as an antisolvent to prepare nanostructured homogeneous mixtures of Cu2+ and Mn3+ with crystallites of 10–20 nm in diameter. Following calcination, this material forms a crystalline tetragonal spinel, CuMn2O4, which is more than twice as active as the conventionally prepared hopcalite catalysts for the oxidation of carbon monoxide.

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      Suppressed Native Hydrolytic Activity of a Lipase to Reveal Promiscuous Michael Addition Activity in Water (pages 252–258)

      Maria Svedendahl, Biljana Jovanović, Linda Fransson and Per Berglund

      Version of Record online: 11 AUG 2009 | DOI: 10.1002/cctc.200900041

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      Enzyme catalytic promiscuity: The native hydrolytic and promiscuous Michael addition activities of Pseudozyma antarctica lipase B, formerly known as Candida antarctica lipase B, are explored with and without the nucleophilic Ser 105 residue in the active site by using both laboratory experiments and molecular modeling (see picture).

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      An Integrated Catalytic and Transient Study of Sulfated Zirconias: Investigation of the Reaction Mechanism and the Role of Acidic Sites in n-Butane Isomerization (pages 259–269)

      Cornelia Breitkopf

      Version of Record online: 8 SEP 2009 | DOI: 10.1002/cctc.200900050

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      The isomerization ofn-butane on sulfated zirconias is investigated by a combination of standard and transient methods (temporal analysis of products (TAP)) to describe the adsorption and reaction of C4 alkanes over a wide pressure range. The transient TAP reactor enables the simultaneous description of diffusion, sorption, and reaction with a high time resolution.

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      Alumina-Supported Ni–Au: Surface Synergistic Effects in Catalytic Hydrodechlorination (pages 270–278)

      Mark A. Keane, Santiago Gómez-Quero, Fernando Cárdenas-Lizana and Wenqin Shen

      Version of Record online: 19 AUG 2009 | DOI: 10.1002/cctc.200900070

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      Set your phases to “gas”: The intro- duction of Au to Ni/Al2O3 (see representative TEM) by reductive deposition resulted in a significant promotion of the gas-phase catalytic hydrodechlorination of 2,4-dichlorophenol to phenol, a response that can be attributed to surface Au–Ni synergy leading to a more effective C[BOND]Cl bond scission.

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      Development of a Recyclable and Low-Leaching Palladium Catalyst Supported on Sulfur-Modified Gallium Arsenide (001) for Use in Suzuki–Miyaura Coupling (pages 279–285)

      Naoyuki Hoshiya, Nobuhiro Isomura, Masahiko Shimoda, Hideki Yoshikawa, Yoshiyuki Yamashita, Kanji Iizuka, Shiro Tsukamoto, Satoshi Shuto and Mitsuhiro Arisawa

      Version of Record online: 19 AUG 2009 | DOI: 10.1002/cctc.200900087

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      The heterogeneous palladium catalyst {Pd}–S–GaAs(001) has both low leaching and high recyclability for Suzuki–Miyaura coupling reactions. The properties of the catalyst are clarified by detailed analysis. In particular, measurements of the catalyst surface by synchrotron radiation X-ray photoelectron spectroscopy show a relationship between the surface and the activity of the catalyst.

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      Probing Surface Properties and Reaction Intermediates During Heterogeneous Catalytic Oxidation of Acetaldehyde (pages 286–294)

      Richard Kydd, Wey Yang Teoh, Jason Scott, Davide Ferri and Rose Amal

      Version of Record online: 24 AUG 2009 | DOI: 10.1002/cctc.200900099

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      A copper penny—more than it's worth: The activities of metal oxide-supported copper catalysts are investigated for the oxidation of acetaldehyde. Intermediate surface carboxylates are identified in an effort to try to understand the mechanism of the reaction. The basicity of the metal oxides and surface oxygen availability play key roles in determining the activity of these catalysts.

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      X-ray Absorption Spectroscopy of an Fe-Promoted Rh/TiO2 Catalyst for Synthesis of Ethanol from Synthesis Gas (pages 295–303)

      Makarand R. Gogate and Robert J. Davis

      Version of Record online: 31 AUG 2009 | DOI: 10.1002/cctc.200900104

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      X-ray vision: X-ray absorption near-edge structure and extended X-ray absorption fine structure spectroscopies are used to elucidate the structural features of a Rh–Fe/TiO2 catalyst for syngas conversion to ethanol. Although both Rh and Fe are initially in the +3 oxidation state, heating the catalyst in H2 to 573 K completely reduces Rh to the metal, with a slight negative charge, and partially reduces the Fe promoter to FeII oxide.

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      Catalysis of Hydrosilylation by Well-Defined Surface Rhodium Siloxide Phosphine Complexes (pages 304–310)

      Bogdan Marciniec, Karol Szubert, Marek J. Potrzebowski, Ireneusz Kownacki and Hieronim Maciejewski

      Version of Record online: 17 SEP 2009 | DOI: 10.1002/cctc.200900111

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      Define art of surfaces: Well-defined rhodium siloxide surface complexes, prepared directly from molecular precursors [Rh(cod)(PR3)(OSiMe3)] (R=Cy, Ph, or iPr; cod=1,5-cyclooctadiene) and characterized by solid-state magic-angle spinning NMR spectroscopy, appear to be highly effective catalysts for the hydrosilylation of olefins. The immobilized catalysts retained their effectiveness even after recycling up to at least five times.

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      Production of Hydrogen from Dimethyl Ether over Supported Rhodium Catalysts (pages 311–317)

      Gyula Halasi, Tamás Bánsági and Frigyes Solymosi

      Version of Record online: 11 AUG 2009 | DOI: 10.1002/cctc.200900113

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      Ether awe: IR spectroscopy (see spectra) revealed the partial dissociation of dimethyl ether (DME) on CeO2 and Rh/CeO2 at 300–373 K to give methoxy species. Rh/CeO2 effectively catalyzed the decomposition of DME to H2, CO, and CH4 as major products. Addition of water to DME increased the selectivity of hydrogen formation from ∼30 to 58 % at 773 K. Deactivation of the catalyst did not occur at 773 K after 10 h.

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      Model NOx Storage Materials at Realistic NO2 Pressures (pages 318–325)

      Aine Desikusumastuti, Stefan Schernich, Markus Happel, Marek Sobota, Mathias Laurin and Jörg Libuda

      Version of Record online: 16 SEP 2009 | DOI: 10.1002/cctc.200900137

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      Never-ending storage: Model systems for NOx storage and reduction are investigated by in situ time-resolved infrared reflection absorption spectroscopy (IRAS) from ultrahigh vacuum conditions up to realistic NO2 pressures. The for- mation of bulk nitrate phases requires very high NO2 exposures and realistic pressure conditions.

  9. Preview

    1. Top of page
    2. Cover Picture
    3. Graphical Abstract
    4. News
    5. Reviews
    6. Minireview
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    8. Communications
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      Preview: ChemCatChem 3/2009 (page 327)

      Version of Record online: 28 SEP 2009 | DOI: 10.1002/cctc.200990008

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