Exchange of D-2 With the OH groups of several oxides was carried out on the samples on which we investigated the O-18(2)/(OH)-O-16 exchange (part I, J. Phys. Chem. 1996, 100, 9429). Temperature-programmed isotopic exchange was first carried out on the bare oxides. In every case, the reaction follows a simple heteroexchange mechanism, with HD as a primary product. The maximal rates of exchange are obtained at the following temperature : CeO2 (prereduced), 100 degrees C > MgO, 120 degrees C > ZrO2, 145 degrees C > CeO2 (preoxidized), 160 degrees C > gamma-Al2O3, 190 degrees C > Cl-Al2O3, 200 degrees C much greater than SiO2, 540 degrees C. The first two samples exchange their hydrogen at a significant rate at room temperature. Secondary peaks and shoulders show the multiplicity of the OH groups on most oxides. Compared to oxygen, hydrogen exchange occurs at much lower temperatures, the shift of the temperature ranges of O and H exchange being between 250 and 430 degrees C. Isothermal isotopic exchange was carried out between 25 and 100 degrees C over rhodium catalysts supported on these oxides.