The desorption behaviors of C¹⁸O on the particle surface of SrO(001)were investigated by the method of Temperature Programmed Desorption(TPD).The mechanism responsible for desorption process and the relationship between adsorption and desorption were discussed.C¹⁶O formed due to the exchange of oxygen isotopes and escaped from the surface of SrO particles during heating the particles pretreated with the absorption of C¹⁸O gas.A small amount of C¹⁸O also desorbed from the particle surface and the activation energy of C¹⁸O desorption was approximate to that of C¹⁶O desorption.With the increasing of the exposure amount of C¹⁸O gas,the desorption amount of C¹⁶O was increased and the peak desorption temperature was decreased.However,the desorption amount of C¹⁶O tended to become constant when the surface coverage of C¹⁸O gas was higher than a certain value.

Key words: CO, SrO, adsorption, desorption, activation energy