物理化学学报 >> 1989, Vol. 5 >> Issue (03): 367 -369 .doi: 10.3866/PKU.WHXB19890322
徐卫星; 杨上闰; 傅献彩
Xu Weixin; Yang Shangrun*; Fu Xiancai
The existence of the surface and the lattice oxygen of V_2O_5 has been investigated by the temperature programmed desorption-mass spectrography (TPD-MS) technique. Four peaks were recorded for a TPD-MS run. They are tentatively assigned to be the adsorbed oxygen (Ⅰ, Ⅱ), the surface lattice oxygen (Ⅲ), and the lattice oxygen in the bulk. The ratio of the oxygen of peak Ⅳ to all of the oxygen in V_2O_5 (see Table 1 ) is 0.20 which implies that the lattice oxygen in the bulk of V_2O_5 desorbes according to the reaction:V_2O_5→V_2O_4+1/2O_2Its activation energy of desorption E_d is 217 kJ.mol~(-1) with a pre-exponential factor A=2.3×10~8 s~(-1) (2nd order). On the contrary, the E_d and A for peak III are 386 kJ.mol~(-1) and 1.4×10~(23) s~(-1) (1st order), respectively.The difference between our TPD result and that of the references [4,3] has been discussed.
徐卫星;杨上闰;傅献彩. V2O5表面氧和晶格氧的热脱附性能[J]. 物理化学学报, 1989, 5(03): 367 -369 .
Xu Weixin; Yang Shangrun*; Fu Xiancai. THERMAL DESORPTION PROPERTIES OF THE SURFACE AND LATTICE OXYGEN OF V2O5[J]. Acta Phys. -Chim. Sin., 1989, 5(03): 367 -369 .
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