Efficiency of the isotope exchange between sodium 4-phenylbenzoate and tritium under different activation conditions

摘要

It has been shown that when a mixture of sodium 4-phenylbenzoate and 5% Pd/C preliminarily exposed to a molecular tritium atmosphere at 333 K for 25 min is treated with atomic protium, tritium is incorporated into sodium 4-phenylbenzoate molecules. The resulting molar radioactivity of this compound is as high as 0.8 +/- 0.2 Ci/mmol, and the molar radioactivity of 4-cyclohexylbenzoic acid turns out to be fourto-five times higher than that of labeled sodium 4-phenylbenzoate. It has been suggested that the interaction of protium atoms with (H-3+)(A") clusters formed on the support surface upon tritium spillover can initiate isotope exchange and hydrogenation reactions.