Abstract
The effects of addition of CsCl to catalysts for the gas-phase acetoxylation of 1,3-butadiene were studied. On catalysts without CsCl, much carbon deposit was seen and the catalysts turned black in the presence of 1,3-butadiene and O 2. On the other hand, the catalysts with CsCl did not change colour, having no carbon deposit. The amount of carbon deposit increased with increasing carrier acidity. It is concluded that CsCl essentially has two effects: one is to decrease the amount of butadiene adsorbed on Pd; the other is to neutralize the acidic sites on the carrier with Cs +. The combination of these effects leads to suppression of the formation of coke and polymer on the catalyst and an excellent improvement in catalyst life.
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