外文翻译,求高人帮忙翻译一下!急!谢谢!The thermal behaviour of TiO2-WO3-V2O5 catalysts with various vanadia contents (1, 2 and 3 wt.% V2O5) was investigatedusing X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Raman spe

外文翻译,求高人帮忙翻译一下!急!谢谢!The thermal behaviour of TiO2-WO3-V2O5 catalysts with various vanadia contents (1, 2 and 3 wt.% V2O5) was investigatedusing X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Raman spe
外文翻译,求高人帮忙翻译一下!急!谢谢!
The thermal behaviour of TiO2-WO3-V2O5 catalysts with various vanadia contents (1, 2 and 3 wt.% V2O5) was investigated
using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy and BET surface area
determination. The activity and selectivity of the new and thermally treated catalysts were tested in the SCR reaction. Both
structural and catalytic investigations have shown that the vanadia content has a strong effect on the thermal behaviour of the
SCR catalysts. The structural investigations evidenced anatase sintering, increase of polymeric vanadyl surface species and
three-dimensional growth of supported vanadia upon ageing. The catalytic tests have shown that the SCR activity of catalysts
containing 1 or 2% V2O5 increased upon ageing, whereas the SCR performance of the catalyst with 3% V2O5 decreased.
The observed improvement of the SCR performance is attributed to an increase of the amount of polymeric vanadyl surface
species upon ageing. The decrease of the SCR performance of the catalyst with 3% V2O5 is due to the extensive loss of surface
area and to the three-dimensional growth of supported vanadia upon ageing. The catalyst containing 2% V2O5 represents the
best compromise between high SCR activity and good thermal stability.
其实我只是想知道文中的upon aging到底翻译成什么，告诉我这个怎么翻就行了~~谢谢~~

外文翻译,求高人帮忙翻译一下!急!谢谢!The thermal behaviour of TiO2-WO3-V2O5 catalysts with various vanadia contents (1, 2 and 3 wt.% V2O5) was investigatedusing X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Raman spe
upon aging
老化后