The present investigation concentrates on the reduction of NO_x emissions, the indirect greenhouse gases, which generate ozone by reacting with the atmosphere. A series of composite catalytic support (TiO₂-CNTs) with a constant TiO₂-CNT ratio prepared by precipitation method was utilized to synthesize Fe-modified V₂O₅/TiO₂-CNT catalyst for selective catalytic reduction (SCR) of NO_x with ammonia (NH₃). The structural and surface characteristics of the prepared catalyst were investigated by using Brunauer–Emmett–Teller surface area measurement, X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscope, and temperature-programmed desorption (TPD) techniques. In terms of catalytic activity, VFe₃TiC₁₀ catalyst showed better SCR performance having a NO_x conversion efficiency of 95% and 98% at 250 °C and 300 °C, respectively. The improved performance could be attributed to high surface chemisorbed oxygen on the surface of the catalyst by the added Fe species which promotes the SCR activity. The catalytic activity results depicted that the addition of CNTs to TiO₂ support enhanced the SCR activity of the catalyst at low reaction temperatures and it also provides better resistance to SO₂. In addition, the effects of Fe modification on the NH₃ removal efficiency of the catalyst were also investigated.

Graphical abstract

对NO的还原本调查浓缩物_X的排放，间接温室气体，其通过与大气反应而产生臭氧。利用沉淀法制备了一系列具有恒定TiO ₂ -CNT比的复合催化剂载体（TiO ₂ -CNTs），合成了Fe修饰的V ₂ O ₅ / TiO ₂ -CNT催化剂，用于NO的选择性催化还原（SCR）。_x与氨水（NH ₃）。通过使用Brunauer-Emmett-Teller表面积测量，X射线衍射，X射线光电子能谱，扫描电子显微镜和程序升温脱附（TPD）技术研究了所制备催化剂的结构和表面特性。在催化活性方面，VFE ₃的TiC ₁₀催化剂显示出具有更好的NO SCR性能_X的95％，分别250℃和300℃下的转换效率和98％。改进的性能归因于催化剂表面上高表面化学吸附的氧，这是由于添加了可促进SCR活性的Fe物种所致。催化活性结果表明，向TiO _2中添加了CNT载体提高了催化剂在低反应温度下的SCR活性，还提供了更好的SO ₂耐受性。另外，还研究了Fe改性对催化剂的NH ₃去除效率的影响。

图形概要