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14.909 Aktuelle Fachpublikationen zum Thema temperature

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Platinum nanoparticles strongly associated with graphitic carbon nitride as efficient co-catalysts for photocatalytic hydrogen evolution under visible light

21.10.2014 | Yasuhiro Shiraishi; Yusuke Kofuji; Shunsuke Kanazawa; Hirokatsu Sakamoto; Satoshi Ichikawa; Shunsuke Tanaka; Takayuk ..., Chemical Communication, 2014

Platinum (Pt) nanoparticles with <4 nm diameter loaded on graphitic carbon nitride (g-C3N4) by reduction at 673 K behave as efficient co-catalysts for photocatalytic hydrogen evolution under visible light (λ

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Main-group catalysed reduction of unsaturated bonds

21.10.2014 | Kseniya Revunova; Georgii I. Nikonov, Dalton Transactions, 2014

This Perspective highlights the recent developments in the reduction of unsaturated substrates catalysed by main-group element compounds. Various activation modes are discussed and comparison with relevant examples from transition metal systems is made when possible. Main-group element catalysis ...

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Redox-responsive organometallic hydrogels for in-situ metal nanoparticle synthesis

21.10.2014 | Mark A. Hempenius; Bram Zoetebier; G. Julius Vancso, Chemical Communication, 2014

A new class of redox active hydrogels composed of poly(ferrocenylsilane) polyanion and poly(ethylene glycol) chains was assembled, using a copper-free azide-alkyne Huisgen cycloaddition reaction. These organometallic hydrogels displayed reversible collapse and reswelling upon chemical oxidation ...

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Single catalyst electrocatalytic reduction of CO2 in water to H2+CO syngas mixtures with water oxidation to O2

21.10.2014 | Peng Kang; Zuofeng Chen; Animesh Nayak; Sheng Zhang; Thomas J. Meyer, Energy & Environmental Science, 2014

A single Ru(ii) polypyridyl carbene complex catalyzes the electrochemical reduction of CO2 in water with added bicarbonate to give syngas H2+CO mixtures at the cathode and water oxidation to O2 at the anode. The H2/CO ratio in the syngas product can be adjusted between 4 [ ] : [ ] 1 and 1 [ ] : [ ...

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Si-mediated fabrication of reduced graphene oxide and its hybrids for electrode materials

21.10.2014 | Barun K Barman; Karuna Kar Nanda, Green Chemistry, 2014

Here, we demonstrate Si-mediated environment friendly reduction of graphene oxide (GO) and the fabrication of hybrids with the multiwall carbon nanotubes and nanofibers. The reduction of GO is facilitated by the nascent hydrogen generated by the reaction between Si and KOH at ~60 0C. The overall ...

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Tandem-reduction of DMF with silanes via necklace-type transition over Pt(0) nanoparticles: deciphering the dual Si–H effect as an extension of steric effects

21.10.2014 | Vijay P. Taori; Michael R. Buchmeiser, Chemical Communication, 2014

Dimethylformamide (DMF) undergoes “double-reduction” to yield trimethylamine as a result of the concerted activation of DMF by two Si–H bonds (from different Si atoms) over Pt(0) nanoparticles as catalytic centers. Sterics on the Si atom govern the reaction and are also decisive for the structure ...

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Steam reduction of CO2 on Pd/TiO2 catalysts: a comparison between thermal and photocatalytic reaction

21.10.2014 | Vincenzo Vaiano; Diana Sannino; Paolo Ciambelli, Photochemical & Photobiological Sciences, 2014

The aim of this work is to compare traditional catalysis, which drives chemical reactions by thermal energy, with a photocatalytic process that can induce chemical reactions by light activation. Taking apart the obvious economic advantage to operate in mild conditions, a closer view of the ...

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Highly selective transfer hydrogenation of functionalised nitroarenes using cobalt-based nanocatalysts

21.10.2014 | Rajenahally V. Jagadeesh; Debasis Banerjee; Percia Beatrice Arockiam; Henrik Junge; Kathrin Junge; Marga-Martina Poh ..., Green Chemistry, 2014

Anilines are important feedstock for the synthesis of a variety of chemicals such as dyes, pigments, pharmaceuticals and agrochemicals. The chemoselective catalytic reduction of nitro compounds represents the most important and prevalent process for the manufacture of functionalized anilines. ...

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A cis‐Divacant Octahedral and Mononuclear Iron(IV) Imide

20.10.2014 | Keith Searles, Skye Fortier, Marat M. Khusniyarov, Patrick J. Carroll, Jörg Sutter, Karsten Meyer, Daniel J. Mindiol ..., Angewandte Chemie International Edition, 2014

Abstract A rare, low‐spin FeIV imide complex [(pyrr2py)FeNAd] (pyrr2py2−=bis(pyrrolyl)pyridine; Ad=1‐adamantyl) confined to a cis‐divacant octahedral geometry, was prepared by reduction of N3Ad by the FeII precursor [(pyrr2py)Fe(OEt2)]. The imide complex is low‐spin with ...

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Catalytic Dinitrogen Reduction at the Molybdenum Center Promoted by a Bulky Tetradentate Phosphine Ligand

20.10.2014 | Qian Liao, Nathalie Saffon‐Merceron, Nicolas Mézailles, Angewandte Chemie International Edition, 2014

Abstract Stoichiometric reduction of N2 at a Mo center stabilized by a bulky tetradentate phosphine ligand () allowed isolation of Mo–imidoamine and Mo–imido complexes. Both complexes as well as the MoII precursor are equally suitable catalysts for the synthesis of NTMS3 (TMS=trimethylsilyl) ...

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