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采用程序升温脱附实验方法测量氧的同位素C16O2,C18O2和18O2分别在Ni16O表面吸附后的脱附谱,其结果表明C16O2在Ni16O表面吸附后出现C16O2和C16O两个波峰,且C16O2和C16O的脱附量随C16O2气体暴露量增加而增加,其峰值温度随C16O2气体暴露量增加而减少,当C16O2气体覆盖度超过一定值后,C16O2和C16O脱附量趋于常数,其活化能分别是0.48 eV和0.42 eV。C18O2在Ni16O表面吸附后出现C16O2,C18O16O,C18O2三个波峰,这说明吸附气体C18O2与Ni16O表面发生氧同位素交换,随温度升高而脱附出C16O2;18O2在NiO表面吸附后主要以18O2脱附,说明了富18O2有相对抑制与Ni16O表面氧的同位素交换的作用。
The desorption spectra of oxygen isotopes C16O2, C18O2 and 18O2 adsorbed on Ni16O surface were measured by temperature-programmed desorption experiment. The results showed that C16O2 and C16O peaks appeared on the surface of Ni16O adsorbed on C16O2, and the peaks of C16O2 and C16O With the C16O2 gas exposure increased, the peak temperature decreased with the increase of C16O2 gas exposure. When C16O2 gas coverage exceeded a certain value, the desorption capacity of C16O2 and C16O tended to be constant, and their activation energies were 0.48 eV And 0.42 eV. The C16O2, C18O16O and C18O2 peaks appear on the surface of Ni16O, which indicates that oxygen isotope exchange occurs between the adsorption gas C18O2 and Ni16O surface and desorbed out of C16O2 with the increase of temperature. The adsorption of 18O2 mainly on 18O2 after NiO adsorption , Indicating that the rich 18O2 has relative inhibition of the surface oxygen and Ni16O isotope exchange role.