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中文摘要：
将V2O5担载在活性焦（AC）上制得V2O5／AC催化剂，通过吸附脱附实验、程序升温脱附实验与原位质谱结合，对200℃下NH3在V2O5／AC催化剂表面的吸附和氧化行为进行了研究，结果表明，AC具有吸附NH3和将NH3转化为NO的能力，这种能力可能源于两种活性位；担载V2O5后，催化剂对NH3的吸附能力显著增强，并产生了新的NH3氧化产物N2，但NH3氧化为NO的能力减弱；SO2在催化剂表面的吸附进一步增大了V2O5／AC对NH3的吸附量．这可能是因为硫铵盐的生成消除了催化剂将NH3氧化转化为NO和N2的能力．当催化剂表面吸附的NH3接近饱和，即表面接近酸碱平衡后NH3才能被氧化为N2，NH3的几个氧化反应都主要依赖气相的O2，催化剂自身的化合氧作用很小．
英文摘要：
Adsorption and oxidation of NH3 is the key step in the selective catalytic reduction （SCR） of NO with NH3. In this paper, a V2O5/activated coke （AC） catalyst was prepared, and it proved to be highly active for SO2 and NO removal from the flue gas at about 200℃. Adsorption and temperature-programmed desorption with on-line mass spectroscopy analysis were used to study the adsorption and oxidation behavior of NH3 at 200℃ over the V2O5/AC catalyst. AC can adsorb NH3 and oxidize NH3 to NO, suggesting the presence of two types of active sites. Supporting V2O5 on AC improves the NH3 adsorption capacity and results in the formation of a new NH3 oxidation product, N2. Adsorption of SO2 on V2O5/AC to saturation （3.1%S） further promotes the NH3 adsorption, but eliminates the oxidation of NH3 to NO and N2. However, the neutralization of the sulfated V2O5/AC with NH3 is needed in order to recover its ability to oxidize NH3 to N2. All the NH3 oxidation reactions depend on the gas phase O2, but the oxygen in AC and V2O5 plays little role in the NH3 oxidation.
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