CAJ | 학술논문

为替代传统的贵金属基NOx储存还原(NSR)催化剂,本文设计并制备了不含贵金属的BaFeO3-x+Cu-ZSM-5耦合催化剂,用于催化消除稀燃发动机尾气中的NOx.在稀燃阶段, NO在BaFeO3-x催化剂上发生了氧化和储存反应；在富燃阶段,从BaFeO3-x催化剂中脱附出来未能消除的NOx被置于其后的Cu-ZSM-5催化剂进一步催化消除.实验结果表明, BaFeO3-x+Cu-ZSM-5耦合催化剂的工作温度窗口被拓宽到250-400°C,同时NOx消除性能得到了显著提高：NOx转化率最高可达98%, N2选择性接近100%.
위체대전통적귀금속기NOx저존환원(NSR)최화제,본문설계병제비료불함귀금속적BaFeO3-x+Cu-ZSM-5우합최화제,용우최화소제희연발동궤미기중적NOx.재희연계단, NO재BaFeO3-x최화제상발생료양화화저존반응；재부연계단,종BaFeO3-x최화제중탈부출래미능소제적NOx피치우기후적Cu-ZSM-5최화제진일보최화소제.실험결과표명, BaFeO3-x+Cu-ZSM-5우합최화제적공작온도창구피탁관도250-400°C,동시NOx소제성능득도료현저제고：NOx전화솔최고가체98%, N2선택성접근100%.
A BaFeO3-x+Cu-ZSM-5 coupled catalyst was designed and synthesized to eliminate the NOx emitted from lean-burn exhausts, providing an alternative to the traditional noble-metal-based NOx storage reduction (NSR) catalysts. During the lean-burn period, the NO oxidation and storage processes mainly occurred over the BaFeO3-x catalyst. During the fuel-rich period, the released NOx from the BaFeO3-x catalyst was further reduced over the Cu-ZSM-5 catalyst. Our results show that, compared with the BaFeO3-x and Cu-ZSM-5 catalyst alone, the operating temperature window of the coupled BaFeO3-x+Cu-ZSM-5 catalyst is extended from 250 to 400 °C, and its NOx elimination performance is significantly improved. The maximum NOx conversion of the coupled catalyst was 98%, while the N2 selectivity was close to 100%.