ChemCatChem

Cover image for Vol. 2 Issue 9

September 17, 2010

Volume 2, Issue 9

Pages 1017–1175

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Graphical Abstract
    4. News
    5. Review
    6. Highlights
    7. Communications
    8. Full Papers
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    1. Cover Picture: A Theoretical Study of the Mechanism of the Desymmetrization of Cyclic meso-Anhydrides by Chiral Amino Alcohols (ChemCatChem 9/2010) (page 1017)

      Burcu Dedeoglu, Dr. Saron Catak, Prof.  K. N. Houk and Prof. Viktorya Aviyente

      Article first published online: 14 SEP 2010 | DOI: 10.1002/cctc.201090035

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      The cover picture shows the reaction coordinate for the alcoholysis of cyclic meso-anhydrides catalyzed by α-amino alcohols. Starting from the left, the reaction has two pathways, either general base catalysis (blue) or nucleophilic catalysis (orange). In their article on pages 1122–1129, Aviyente and co-workers identify the transition structures along the general base and the nucleophilic catalysis pathways. The energy required to pass through the barrier in the general base catalysis pathway is less than that required in the nucleophilic catalysis pathway.

  2. Graphical Abstract

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    3. Graphical Abstract
    4. News
    5. Review
    6. Highlights
    7. Communications
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  3. News

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    4. News
    5. Review
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  4. Review

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    1. Development of Novel Catalysts for Fischer–Tropsch Synthesis: Tuning the Product Selectivity (pages 1030–1058)

      Dr. Qinghong Zhang, Jincan Kang and Prof. Dr. Ye Wang

      Article first published online: 6 JUL 2010 | DOI: 10.1002/cctc.201000071

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      Now my art is fuel: Fischer–Tropsch synthesis is a key step for transformation of non-petroleum feedstock to clean fuels and valuable chemicals. The utilization of nanoporous materials and carbon nanotubes or nanofibers and the development of zeolite-containing bifunctional catalysts provide new opportunities to tune the product selectivity.

  5. Highlights

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    1. Mechanoassisted Supramolecular Catalysis in Solid State Synthesis (pages 1059–1060)

      Dr. Da-You Ma and Dr. Kenneth Wärnmark

      Article first published online: 14 JUL 2010 | DOI: 10.1002/cctc.201000150

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      Higher ground: Stereospecific and quantitative [2+2] photodimerization of trans-1,2-bis(4-pyridyl)ethylene in solid state is effectively catalyzed by 4,6- dichlororesorcinol in a supramolecular fashion. Grinding is the crucial process to drive the catalytic cycles.

    2. Overcoming Limitation in the Design of Selective Solid Catalysts by Manipulating Shape and Size of Catalytic Particles: Epoxidation Reactions on Silver (pages 1061–1063)

      Prof. Suljo Linic and Phillip Christopher

      Article first published online: 2 AUG 2010 | DOI: 10.1002/cctc.201000163

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      Shaping up selectivity: Developments in the synthesis of catalytic particles of targeted size and shape might create opportunities for the design of catalysts for the selective heterogeneous production of low-volume, high-value commodity chemicals. Although these advances are encouraging, scale-up issues in the synthesis of exotic nanostructures and their long-term stability under reaction conditions need to be addressed.

  6. Communications

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    1. The Influence of Preparation Method on Mn–Co Interactions in Mn/Co/TiO2 Fischer–Tropsch Catalysts (pages 1065–1068)

      Theresa E. Feltes, Yuan Zhao, Prof. Robert F. Klie, Prof. Randall J. Meyer and Prof. John R. Regalbuto

      Article first published online: 22 JUN 2010 | DOI: 10.1002/cctc.201000103

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      The addition of a Mn promoter to a Co3O4/TiO2 catalyst can be selectively (by strong electrostatic adsorption) or randomly (by dry impregnation) introduced to the Co3O4. Although restructuring during reduction treatments lead to a similar final state placement of the Mn, its interaction with Co could still be quite different and influence the performance of the catalyst.

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      Catalyst Composition, Morphology and Reaction Pathway in the Growth of “Super-Long” Carbon Nanotubes (pages 1069–1073)

      Ravi Joshi, Dr. Jörg Engstler, Dr. Lothar Houben, Dr. Maya Bar Sadan, Prof. Dr. Anke Weidenkaff, Dr. Petar Mandaliev, Dr. Alexander Issanin and Prof. Dr. Jörg J. Schneider

      Article first published online: 10 JUN 2010 | DOI: 10.1002/cctc.201000037

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      What took so long? An ex situ investigation of an iron–aluminum nanocatalyst that is active in the water-assisted growth of “super-long” carbon nanotubes (CNTs) with different techniques (HRSTEM, EELS, XPS, GIXRD) reveals for the first time its bimetallic nature. Besides metallic aluminum and iron, mixed oxides, hydroxides, and aluminum oxycarbides play a role in the CNT growth process.

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      Plasma Synthesis of Highly Dispersed Metal Clusters Confined in Nanosized Zeolite (pages 1074–1078)

      Dr. Mickaël Rivallan, Ivan Yordanov, Dr. Sébastien Thomas, Dr. Christine Lancelot, Dr. Svetlana Mintova and Dr. Frédéric Thibault-Starzyk

      Article first published online: 23 JUL 2010 | DOI: 10.1002/cctc.201000113

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      Plasma preparation: Low-pressure plasma treatment of a templated Pt/BEA zeolite results in fast and total degradation of the organic template with simultaneous reduction of the Pt cations to clusters with a size of 1 nm. Operando FTIR study confirms the enhanced mechanism of reduction of Pt cations to clusters entrapped in the BEA zeolite pores.

    4. Immobilized Chromium Catalyst System for Selective Ethene Trimerization to 1-Hexene with a PNPNH Ligand (pages 1079–1081)

      Dr. Normen Peulecke, Dr. Bernd H. Müller, Stephan Peitz, Dr. Bhaskar R. Aluri, Prof. Dr. Uwe Rosenthal, Dr. Anina Wöhl, Dr. Wolfgang Müller, Dr. Mohammed H. Al-Hazmi and Fuad M. Mosa

      Article first published online: 21 MAY 2010 | DOI: 10.1002/cctc.201000087

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      Tie me catalyst down, support: A selective homogeneous chromium-based ethene trimerization catalyst is heterogenized by immobilization on a functionalized polymer support. The immobilized catalyst displays good selectivity towards 1-hexene, and retains high activity for long times on-stream, combining advantages of homogeneous and heterogeneous catalyst systems.

    5. Photothermocatalytic Synergetic Effect Leads to High Efficient Detoxification of Benzene on TiO2 and Pt/TiO2 Nanocomposite (pages 1082–1087)

      Prof. Yuanzhi Li, Prof. Jichao Huang, Tao Peng, Jie Xu and Xiujian Zhao

      Article first published online: 10 JUN 2010 | DOI: 10.1002/cctc.201000085

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      Photothermocatalyticexpialadocious: The highly efficient photothermocatalytic detoxification of benzene is realized by coating nano TiO2 on the surfaces of a UV lamp without using an additional heater. Its high photothermocatalytic efficiency can be significantly enhanced by supporting well-dispersed Pt nanoparticles on TiO2. The excellent photothermocatalytic performance of TiO2 and Pt/TiO2 is due to the existence of new photothermocatalytic synergetic effects.

  7. Full Papers

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    3. Graphical Abstract
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    1. You have free access to this content
      Promotion of Direct Methanol Electro-oxidation by Ru Terraces on Pt by using a Reversed Spillover Mechanism (pages 1089–1095)

      Simon Jones, Karaked Tedsree, Montree Sawangphruk, Prof. John S. Foord, Dr. Janet Fisher, Dr. David Thompsett and Prof. Shik Chi E. Tsang

      Article first published online: 16 AUG 2010 | DOI: 10.1002/cctc.201000106

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      Extra terrace trials: Using core–shell Pt–Ru nanocatalysts, a new direct pathway based on Pt sites in close proximity to Ru terraces, provides activated methoxy species to Ru terraces which react with surface oxygenates from water dissociation for accelerated CO2 formation. This non-CO route requires a lower potential than the corresponding process on Pt.

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      Embedded Ru@ZrO2 Catalysts for H2 Production by Ammonia Decomposition (pages 1096–1106)

      Dr. Barbara Lorenzut, Dr. Tiziano Montini, Dr. Claudiu C. Pavel, Dr. Massimiliano Comotti, Dr. Francesco Vizza, Dr. Claudio Bianchini and Prof. Paolo Fornasiero

      Article first published online: 26 JUL 2010 | DOI: 10.1002/cctc.201000097

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      Performance off the track: Ru@doped-ZrO2 nanostructured catalysts were prepared by embedding Ru nanoparticles into La-doped ZrO2 (see figure). The catalysts demonstrated good activity and stability for NH3 decomposition in the 400–600 °C temperature range. The results demonstrate how it is possible to enhance the performances of heterogeneous catalysts by careful control of their nanostructure by an appropriate synthetic strategy.

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      X-ray Absorption Spectroscopy of Bimetallic Pt–Re Catalysts for Hydrogenolysis of Glycerol to Propanediols (pages 1107–1114)

      Oliver M. Daniel, Dr. Andrew DeLaRiva, Dr. Edward L. Kunkes, Prof. Abhaya K. Datye, Prof. James A. Dumesic and Prof. Robert J. Davis

      Article first published online: 7 JUL 2010 | DOI: 10.1002/cctc.201000093

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      Propanediols are produced by hydrogenolysis of glycerol over nanometer size carbon-supported Pt–Re particles at 443 K, whereas analogous monometallic particles are inactive. X-ray absorption spectroscopy above the Pt and Re LIII edges reveal that both metals are reduced by H2 at 473 K to form bimetallic particles. The presence of oxophilic Re in contact with Pt promoted the selective hydrogenolysis reaction.

    4. Preparation of Bismuth Oxide Quantum Dots and their Photocatalytic Activity in a Homogeneous System (pages 1115–1121)

      Prof. Hua Zhang, Ping Wu, Yan Li, Lifang Liao, Zheng Fang and Prof. Xinhua Zhong

      Article first published online: 27 JUL 2010 | DOI: 10.1002/cctc.201000090

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      Bi O catalysis: Oil- and water-soluble Bi2O3 colloidal quantum dots are synthesized through alcoholysis followed by surface modification with mercaptopropionic acid. The reusable water-soluble Bi2O3 colloids show very high photocatalytic activity for the degradation of methyl orange dye with various catalyst and dye concentrations at a wide range of pH values.

    5. A Theoretical Study of the Mechanism of the Desymmetrization of Cyclic meso-Anhydrides by Chiral Amino Alcohols (pages 1122–1129)

      Burcu Dedeoglu, Dr. Saron Catak, Prof.  K. N. Houk and Prof. Viktorya Aviyente

      Article first published online: 4 AUG 2010 | DOI: 10.1002/cctc.201000065

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      Ace of base: The mechanism of alcoholysis of cyclic meso-anhydrides catalyzed by β-amino alcohols is investigated by density functional calculations. Both nucleophilic catalysis and general base catalysis pathways are explored, and the nucleophilic pathway is shown to be approximately higher in energy than the general base pathway.

    6. A Kinetic Model for Selective Ethene Trimerization to 1-Hexene by a Novel Chromium Catalyst System (pages 1130–1142)

      Dr. Wolfgang Müller, Dr. Anina Wöhl, Stephan Peitz, Dr. Normen Peulecke, Dr. Bhaskar R. Aluri, Dr. Bernd H. Müller, Dr. Detlef Heller, Prof. Dr. Uwe Rosenthal, Dr. Mohammed H. Al-Hazmi and Fuad M. Mosa

      Article first published online: 22 JUN 2010 | DOI: 10.1002/cctc.201000052

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      Caught in the model: A numerical model has been developed for the kinetics of the selective trimerization of ethene to 1-hexene by a homogeneous catalyst system comprising [CrCl3(thf)3], a Ph2PN(iPr)P(Ph)N(iPr)H ligand, and triethylaluminum. The model calculations and experimental data are in excellent agreement. In conjunction with mechanistic investigations, the model helps to elucidate the complex reaction network.

    7. Characterization of Synthetic Iron Oxides and their Performance as Support for Au Catalysts. (pages 1143–1149)

      Dr. Paolo Centomo, Prof. Marco Zecca, Prof. Vito Di Noto, Dr. Sandra Lavina, Prof. G. Giorgio Bombi, Dr. Luca Nodari, Prof. Gabriella Salviulo, Dr. Roberta Ingoglia, Prof. Candida Milone, Prof. Signorino Galvagno and Prof. Benedetto Corain

      Article first published online: 10 JUN 2010 | DOI: 10.1002/cctc.201000049

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      Gold'n'iron: The catalytic performance of gold catalysts supported on ferric oxide in the selective hydrogenation of benzalacetone to the corresponding α,β-unsaturated alcohol depends on the nanostructure of the support, as identified by a combination of X-ray powder diffraction, Mössbauer spectroscopy, micro-Raman spectroscopy, transmission electron microscopy, and temperature-programmed reduction.

    8. Catalytic Polymer Membranes under Forcing Conditions: Reduction of Nitrobenzene by CO/H2O Catalyzed by Ruthenium Bis(arylimino)acenaphthene Complexes (pages 1150–1164)

      Marta Viganò, Prof. Dr. Fabio Ragaini, Dr. Maria Giovanna Buonomenna, Roberta Lariccia, Prof. Dr. Alessandro Caselli, Prof. Dr. Emma Gallo, Prof. Dr. Sergio Cenini, Dr. Johannes Carolus Jansen and Prof. Dr. Enrico Drioli

      Article first published online: 10 JUN 2010 | DOI: 10.1002/cctc.201000044

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      Diimines are forever: A ruthenium complex with a chelating diimine ligand, embedded in a modified polyether ether ketone (PEEK-WC) membrane, can be used even at 160 °C and under 5 MPa CO as a reusable catalyst for the reduction of nitrobenzene to aniline by CO/H2O. During the reaction, a reduced form of the ligand is formed, which may play a role in reducing the nitroarene, even without the involvement of the metal.

    9. Imidazolium Polyoxometalate: An Ionic Liquid Catalyst for Esterification and Oxidative Esterification (pages 1165–1170)

      Huan Li, Yunxiang Qiao, Li Hua, Prof. Dr. Zhenshan Hou, Bo Feng, Zhenyan Pan, Yu Hu, Xiangrui Wang, Xiuge Zhao and Yinyin Yu

      Article first published online: 22 JUL 2010 | DOI: 10.1002/cctc.201000021

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      I second that emulsion: A novel polyoxometalate-based ionic liquid (POM-IL) acts as a catalyst in esterification and oxidative esterification reactions. The emulsion formed by the IL catalyst and substrates during the reaction can facilitate the catalytic process. After reaction, the liquid catalyst is separated easily by breaking the emulsion and proves to be recyclable.

  8. Preview

    1. Top of page
    2. Cover Picture
    3. Graphical Abstract
    4. News
    5. Review
    6. Highlights
    7. Communications
    8. Full Papers
    9. Preview
    1. Preview: ChemCatChem 10/2010 (page 1175)

      Article first published online: 14 SEP 2010 | DOI: 10.1002/cctc.201090038

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