| 摘要 |
<p>The present invention relates to a supported metal compound comprising a solid support to which are grafted at least two types of metal atom, Me, one in a form (A) of a metal compound where the metal atom is bonded to at least one hydrogen atom and/or to at least one hydrocarbon, and the other in a form (B) of a metal compound where the metal atom is bonded solely to the support and optionally to at least one other element which is neither a hydrogen atom nor a hydrocarbon radical. The compound can be prepared (a) by grafting an organometallic precursor (P) comprising the metal Me, bonded to at least one hydrocarbon ligand, to the solid support, and (b) by treating the solid product resulting from step (a) with hydrogen or a reducing agent, at a temperature greater than the temperature, TI, at which the supported metal compound is formed solely in the form (A), and at a temperature lower than the temperature, T2, at which the supported metal compound is formed solely in the form (B). The compound can be used in particular as a catalyst in a process employing hydrocarbon splitting and recombination reactions, e.g. in a hydrocarbon metathesis reaction, with a greatly increased catalytic activity, in comparison with a supported metal compound which is identical but which would include only the form (A), the form (B) being inactive in this type of reaction.</p> |
