A series of novel Sn modified CeMoO_x electrospun fibers were fabricated using a combination method of sol-gel process and electrospinning technique for the selective catalytic reduction (SCR) of NO with NH₃. The performances of fresh and sulfated Sn modified CeMoO_x catalysts in the presence of different amount of SO₂ at low temperature were investigated. Characterization of these catalysts aimed at elucidating the effect of additive. The catalyst had a Sn/(Sn + Ce + Mo) = 0.2 M ratio showed the widest SCR activity improvement with near 100% NO_x conversion at 225–450 °C with a gas hourly space velocity of 100 000 h⁻¹. X-ray photoelectron spectroscopy (XPS) indicated that Sn modification significantly increases the chemisorbed oxygen species that may facilitate NO oxidation to NO₂. H₂-TPR and NH₃-TPD characterization showed that the catalysts have better redox ability and higher Brønsted acid sites, which is also enhanced by Sn modification. Combined with the adsorption and transient reaction studied from in situ DRIFTs spectra suggested a “fast SCR” reaction route, i.e., the more active NH₄⁺ ions react with gaseous NO₂ molecules, which primarily occurred on the surface of either the fresh or sulfated Sn/0.2-CeMoO_x. Furthermore, as compared to CeMoO_x, the sulfated Sn/0.2-CeMoO_x sample obtained even smaller grain size, better redox ability, higher Brønsted acid sites and more chemisorbed oxygen species, which were contributed to the excellent SO₂ resistance.

结合溶胶-凝胶法和静电纺丝技术，制备了一系列新型的Sn改性的CeMoO _x电纺纤维，用于NH ₃的选择性催化还原（SCR）。新鲜和硫酸化的Sn的性能改性CeMoO _X催化剂在不同量的SO存在₂在低温下进行了调查。这些催化剂的表征旨在阐明添加剂的作用。该催化剂的锡/（SN + CE +沫）= 0.2 M比显示的最宽的SCR活性改善接近100％的NO _X在225-450℃换算为100 000 h的气时空速^-1。X射线光电子能谱（XPS）表明，Sn改性显着增加了化学吸附的氧种类，这可能有助于NO氧化为NO ₂。H ₂ -TPR和NH ₃ -TPD表征表明，该催化剂具有较好的氧化还原能力和较高的布朗斯台德酸中心，这也可以通过Sn改性得到增强。结合原位DRIFTs光谱研究的吸附和瞬态反应，提出了“快速SCR”反应路线，即活性更高的NH ₄ ⁺离子与气态NO ₂分子反应，这主要发生在新鲜的或硫酸盐化的表面上Sn / 0.2-CeMoO _x。此外，与CeMoO相比_x，硫酸化的Sn / 0.2-CeMoO _x样品获得了更小的晶粒尺寸，更好的氧化还原能力，更高的布朗斯台德酸位和更多的化学吸附氧物种，这些都有助于获得出色的SO ₂耐受性。