《Table 3 Average oxidation number of V in the VPO/SiO2catalysts》

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《Influence of V/P Ratio on the Catalytic Performance of VPO/SiO_2 Catalysts for Ammoxidation of Chloro-Substituted Toluenes》

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BET specific surface area and pore analysis of the catalysts were characterized by N2 adsorption and the data are summarized in Table 2.It can be seen from Table 2 that S exhibited the highest surface area（231m2/g）and pore volume（0.78 cm3/g）and dramatically decreased to around 150 m2/g and 0.50 cm3/g after VPO loaded.After reaction，the specific area of the samples decreased and pore diameter increased except VP130.In the fresh samples，the precursor did not decompose completely，and the well dispersed undecomposed VPO particles may be porous，which supply some excess specific surface area.After reaction，the undecomposed VPO particles decomposed and the porous structure disappeared，leading to the decrease of the specific surface area and the increase of the average pore diameter.The reason for the increase of specific area of VP130 after reaction is that some pores were completely blocked before reaction，and the pores reopened after reaction.