Oxygen → Methacrolein

Participants

Reaction Steps

U.S. Pat. No. 3,639,449 describes a very similar process for the preparation of carboxylic acid esters from aldehydes and/or alcohols by reaction with oxygen over a noble metal catalyst (for example palladium) at from 0° to 300° C. Here again, the limited usefulness of a pure palladium catalyst for the preparation of methyl methacrylate is revealed: Example 16, the only example which illustrates the preparation of methyl methacrylate from methanol and methacrolein over a catalyst consisting of 2% of Pd on active carbon, gives a methacrolein conversion of 17.3% with a selectivity of 56.1% as regards methyl methacrylate formation and 40.6% as regards propylene formation.

Provenance & Evidence