中文摘要：

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℃，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％．

英文摘要：

A BaFeO3-x＋Cu-ZSM-5 coupled catalyst was designed and synthesized to eliminate the NO, emitted from leanburn exhausts, providing an alternative to the traditional noble-metal-based NOx storage reduction （NSR） catalysts. During the leanburn 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℃, and its NOx elimination performance is significantly improved. The maximum NO, conversion of the coupled catalyst was 98%, while the N2 selectivity was close to 100%.