Palladium on calcium carbonate

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1. The role of calcium carbonate as a carrier for the palladium catalyst has been examined in the hydrogenation process of 1,4-butynediol.

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2. It was found that the hydrogenation rate using the Pd-CaCO3 catalyst was not the highest among various palladium catalysts. Another key observation was that the partial hydrogenation of 1,4-butynediol could also be achieved using a Pd-BaCO3 catalyst poisoned by both lead acetate and quinoline. Significantly, with the poisoned Pd-CaCO3 catalyst, the unwanted polymerization of 1,4-butynediol was greatly minimized.

3. Therefore, it appears that the primary function of calcium carbonate as a catalyst carrier is to reduce the side reaction of polymerization during hydrogenation, rather than to enhance the activity or selectivity of the hydrogenation process.

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