Abstract：HCl was used to modify the surface acidity of supported vanadium phosphorus oxide (VPO/TiO2) catalysts for NH3-SCR. The results show that the denitration activity of catalyst was the highest with HCl/V molar ratio of 3~5:1, and the efficiency was almost 100% when the reaction temperature reached 200℃. It was found that the addition of HCl improved the crystallinity of the catalyst, and the modification of HCl could slightly increase the specific surface area of the VPO/TiO2 catalyst. Meanwhile, the amount of active component V4+ in the VPO/TiO2 catalyst was gradually increased from 38% to 46%, which improved the redox performance of the catalyst. In addition, the relative content of chemisorbed oxygen in the catalysts with different HCl/V molar ratios increased with the increase of HCl addition amount. The pyridine infrared test results show that HCl affected the acid site of the catalyst, and the catalyst with HCl/V molar ratio=5 had the highest Lewis acid content as 0.84×10-4mol/g. Data fitting results further demonstrate that the low-temperature denitration activities of all VPO/TiO2 catalysts were positively correlated with the amount of weak Lewis acid (correlation coefficient > 0.9), which is consistent with the results of activity test.
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