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Issue 28, 2010
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Operando study of iridium acetylacetonatedecomposition on amorphous silica–alumina for bifunctional catalyst preparation

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Abstract

The decomposition of iridium acetylacetonate Ir(acac)3 impregnated on amorphous silicaalumina (ASA) has been investigated by combined thermogravimetry-differential thermal analysis-mass spectrometry (TG-DTA-MS) and by in situ X-ray diffraction (XRD). The resulting Ir/ASA hydrotreating catalysts have also been characterized by transmission electron microscopy (TEM). The effects of heating treatments under oxidative, reductive or inert gas flows are compared with each other and with similar experiments on ASA-supported acetylacetone (acacH). It is shown that Ir(acac)3 undergoes exothermic combustion during calcination in air, leading to agglomerated IrO2 particles. Conversely, direct reduction involves hydrogenolysis of the acac followed by hydrogenation of the ligand residues to alkanes and water. These two processes are catalyzed by Ir clusters, the gradual growth of which is followed in situ by XRD. The resulting nanoparticles are highly and homogeneously dispersed.

Graphical abstract: Operando study of iridium acetylacetonate decomposition on amorphous silica–alumina for bifunctional catalyst preparation

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Publication details

The article was received on 30 Nov 2009, accepted on 24 Mar 2010 and first published on 25 May 2010


Article type: Paper
DOI: 10.1039/B925062J
Phys. Chem. Chem. Phys., 2010,12, 7812-7820

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    Operando study of iridium acetylacetonate decomposition on amorphous silicaalumina for bifunctional catalyst preparation

    S. Nassreddine, G. Bergeret, B. Jouguet, C. Geantet and L. Piccolo, Phys. Chem. Chem. Phys., 2010, 12, 7812
    DOI: 10.1039/B925062J

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