【摘要】 氨选择性催化还原（NH₃-SCR）是目前较有效的脱硝方法之一,移动源车辆运行条件的变化要求脱硝催化剂具有宽的反应活性温区,同时还应具有良好的水热稳定性。通过将锰基脱硝催化剂的低温性能与铈基脱硝催化剂的高温活性进行复合,形成两段串联式催化剂,实现了催化剂的宽温区性能。为制备出具有良好低温活性和水热稳定性的MnX催化剂,对MnO_x进行金属共掺杂改性,优选的MnCu催化剂具有最宽的脱硝窗口（125～325℃）和良好的水热稳定性。通过将MnCu与Ce-P催化剂组合,制备出MnCu/CeP两段式催化剂,在125～525℃温段内实现了80%以上氮氧化物的脱除,满足移动源脱硝对SCR催化剂的性能要求,具有替代现有商业脱硝催化剂的潜力。更多还原

【Abstract】 Ammonia selective catalytic reduction（NH₃-SCR） is widely recognized as one of the most effective methods for NO_x removal. The variable operating conditions of mobile sources necessitate denitration catalysts with a broad reaction activity window and excellent hydrothermal stability. By combining the low-temperature performance of manganese-based denitrification catalysts with the high-temperature activity of cerium-based denitrification catalysts, a dual-stage series catalysts are employed to broaden the effective temperature window of the catalyst system. To develop an Mn-based（MnX） catalyst with superior low-temperature activity and hydrothermal stability, MnO_x is modified through co-doping with metal oxides. The optimized MnCu catalysts demonstrate the widest denitration window（125-325 ℃） and excellent hydrothermal stability. This MnCu catalysts are combined with a cerium-phosphorus（Ce-P） based catalysts to form a dual-stage MnCu/CeP catalysts system. The MnCu/CeP tandem catalysts achieve over 80% NO_x removal across a broad temperature range of 125-525 ℃. This performance can meet the requirements for SCR catalysts in mobile source denitration applications and demonstrate significant potential as a substitute for commercial denitration catalysts.更多还原