Olefin Metathesis over supported rhenium oxide catalysts

摘要

A supported catalyst for the production of cycloalkaldienes in a metathesis reaction contains: (a) gamma alumina ( gamma -Al2O3) as support material, (b) 1-12 wt.% rhenium oxide (Re2O7), (c) 0-40 wt.% tin alkyl and/or tin oxide (SnR4 and/or SnO2 , where R is 1-8C alkyl) as well as at least one modifier selected from (d) phosphorus, (e) cesium and (f) mineral acid. An Independent claim is also included for a process for the production of cycloalkadienes from cycloalkamonoenes, cyclopolyenes and/or acyclic polyenes in the liquid phase by metathesis in the presence of the catalyst.