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3 wt.% of V₂O₅ is loaded onto the activated semi-coke (V₂O₅/ASC) via impregnation method and used for low temperature selective catalytic reduction (SCR) of NO_x with NH₃. The prepared V₂O₅/ASC catalyst yields an over 90% NO conversion rate with excellent N₂ selectivity at 250 °C with a space velocity of 12,000 h⁻¹. The adsorption state of different species and reaction behaviors under various conditions are systematically examined with in situ diffuse reflectance infrared Fourier transform spectroscopy (in situ DRIFTS). It is evidenced that NH₃ and NO are absorbed on different active sites over the V₂O₅/ASC catalyst. At the reaction temperature (200 °C) in this study, NH₃ is mainly absorbed on the Lewis acid sites provided by V₂O₅, and NO is mainly absorbed on the active sites originated from the support ASC. In addition, the NH₃-SCR process takes place according to two pathways, including reaction …