Abstract
Iridium on active carbon (Ir/A.C.) is an effective catalyst for the vapor-phase carbonylation of methanol. In contrast to rhodium-catalysts the reaction rate is nearly independent of the partial pressure of the methyl iodide promoter and the methanolysis of an iridium-acetyl species has been found to determine the rate. Undesired methane formation accompanying the carbonylation is suggested to proceed via proteolysis of iridium-methyl species by methanol or water. Methyl chloride has been found to be a less effective promoter than methyl iodide.
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Zehl, G., Bischoff, S. & Lücke, B. Vapor-phase carbonylation of methanol on an active carbon supported iridium-catalyst. Catal Lett 19, 247–255 (1993). https://doi.org/10.1007/BF00771761
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DOI: https://doi.org/10.1007/BF00771761