An in situ study of the NO+H2+O2 reaction on Pd/LaCoO3 based catalysts

International audienc

An in situ study of the NO+H2+(O2) reaction on Pd/LaCoO3 based catalysts

21-24 sept. 2005 Présentation : C. Dujardi

Pickering Emulsions Based on Supramolecular Hydrogels: Application to Higher Olefins’ Hydroformylation

International audienceno abstrac

Selective ligand-free cobalt-catalysed reduction of esters to aldehydes or alcohols

International audienceCobalt(II) salts combined with NaBHEt3 and eventually a base catalyse efficiently and selectively the reduction of esters to aldehydes or alcohols through hydrosilylation by using phenylsilane. Catalyst characterisation by XRD, XPS, TEM and STEM analyses indicates the materials were partially crystalline with the presence of cobalt nanoparticles. Control experiments suggested low valent Co(0) was the active catalytic species involved

Aminopolycarboxylate Bismuth(III)-Based Heterometallic Compounds as Single-Source Molecular Precursors for Bi 4 V 2 O 11 and Bi 2 CuO 4 Mixed Oxides

International audienc

Evaluation de la conversion en lit fluidisé dans le cadre du traitement du combustible nucléaire usé

National audienc

Pickering Emulsions Based on Supramolecular Hydrogels: Application to Higher Olefins’ Hydroformylation

Supramolecular hydrogels elaborated from a mixture of native α-cyclodextrin and poly­(ethylene glycol)­s in water proved to be effective media for higher olefins Rh-catalyzed hydroformylation due to the formation of Pickering emulsions

Aminopolycarboxylate Bismuth(III)-Based Heterometallic Compounds as Single-Source Molecular Precursors for Bi₄V₂O₁₁ and Bi₂CuO₄ Mixed Oxides

Five heterometallic complexes of general formula M­(L)_<i>y</i>{Bi­(APC)}₂·<i>n</i>H₂O [M = VO²⁺, Cu²⁺; APC = aminopolycarboxylate, in this work ethylenediaminetetraacetate (edta^4–) or 1,2-cyclohexanediaminetetraacetate (cdta^4–); L = 2,2′-bipyridine; <i>y</i> = 0, 1, or 2; <i>n</i> = 5–16] have been synthesized. The crystal structures of four of them have been determined from single-crystal X-ray diffraction data. The compounds have been probed as single-source molecular precursors for Bi₄V₂O₁₁ and Bi₂CuO₄ mixed oxides. Temperature-controlled X-ray powder diffraction was used to monitor the phase transitions during the thermolysis of the precursors. The influence of the ligand type and intermetallic distances in the precursors, heating rate, and the atmosphere have been investigated. The best candidates to yield pure Bi₄V₂O₁₁ and Bi₂CuO₄ are complexes with separations between heterometals of ∼4 Å containing ∼29–30% of carbon. The optimal working conditions under which the precursors can be smoothly converted to the corresponding heterometallic oxides are heating at low rates under air flow. The precursors containing ∼29–30% of carbon yield smaller grains and more homogeneous morphology of the residues than the analogues with lower or higher carbon amount. The advantage of the APC-based molecular precursor method is compared to previously reported procedures to produce bimetallic oxides