A kinetic study of hydrogen isotope exchange was carried out in a H2/Pd membrane/organic compound system for a number of compounds in the 0.2–20 kPa H2 pressure range. The results suggest a low specificity of the reaction kinetics for the compounds used. Possible reaction mechanisms are discussed and analyzed.
A reaction mechanism is proposed for tritium labelling by the SCRD method /solid-state catalytic reductive dehalogenation/ based on hydrogen spillover. A model system /palladium membrane with a layer of the original organic compound/ is used for a kinetic study of the debromination of 5-bromouracil and the isotope exchange of -alanine at pressure of 0.07–20 kPa. A kinetic model is considered for the spillover stoppage due to the contamination of penetration centres by the reaction product. Other possible causes of the spillover stoppage are discussed.