NH₃ oxidation over V-0.5Ce(SO₄)₂/Ti catalyst used for NH₃-SCR was investigated and compared to that occurred over a commercial V-W/Ti catalyst. It was found that much more significant NH₃ oxidation into N₂ and N₂O occurs over V-0.5Ce(SO₄)₂/Ti than commercial V-W/Ti catalyst at high temperatures (>300 °C). According to the kinetics and characterization results obtained, stronger surface redox properties and a relatively higher concentration of polymerized vanadates present on V-0.5Ce(SO₄)₂/Ti should contribute to its higher NH₃ conversion values. In-situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) studies suggested the formation of -NH imido species, based on which a successive NH₃ dehydrogenation-like mechanism is proposed, which consistently explains well the experimental observations.

对用于NH ₃ -SCR的V-0.5Ce（SO ₄）₂ / Ti催化剂上的NH ₃氧化进行了研究，并将其与在商用VW / Ti催化剂上发生的氧化进行了比较。已发现，在高温（> 300°C）下，V-0.5Ce（SO ₄）₂ / Ti上的NH ₃氧化成N ₂和N ₂ O的程度比商用VW / Ti催化剂高得多。根据获得的动力学和表征结果，V-0.5Ce（SO ₄）₂ / Ti上存在的更强的表面氧化还原性能和相对较高的聚合钒酸盐浓度应有助于其更高的NH ₃转化价值。原位漫反射红外傅里叶变换光谱（DRIFTS）研究表明-NH亚氨基物种的形成，在此基础上提出了类似的NH ₃脱氢样机理，这一直很好地解释了实验观察结果。