Due to the large amounts of CO pollutant from iron ore sintering and vehicle emissions, the control of CO emission becomes more and more important for the environment. To control the emission of CO more effectively, the catalysts of LaMnO₃ perovskite with HZSM-5 zeolite as support were prepared by sol–gel method. The structure and catalytic activities of catalysts were characterized and analyzed. According to the results of X-ray diffraction (XRD) and energy-dispersive X-ray spectroscopy (EDS), the LaMnO₃ perovskite phase is successfully obtained in all the supported catalysts. The average particle sizes of supported catalysts are in the range of 15–38 μm. Compared with the perovskite catalysts loaded on other kinds of supports, LaMnO₃ supported with HZSM-5 has a larger specific surface area (SSA). The SSAs of supported catalysts with different loading amount are in the range of 190–300 m²/g. The HZSM-5 support improves the catalytic activity of LaMnO₃ catalyst by increasing the SSA. The activity of supported catalyst becomes higher when the loading amount increases from 20% to 60%. The catalyst with 60% perovskite loaded shows the best activity in CO catalytic oxidation. The CO conversion of 60LM/HZSM-5 attains 50% and 90% at 172.7°C and 201.5°C, respectively. The activities of catalysts with 80% and 100% perovskite loaded decrease due to the accumulated pores formed by too much perovskite. The supported catalysts exhibit favorable activities in consecutive reaction cycles. It turns out that HZSM-5 support is appropriate for the synthesis of active perovskite catalysts for CO oxidation.

中文翻译：

---

负载在HZSM-5沸石上的LaMnO3催化剂用于CO催化氧化的研究

由于铁矿石烧结和汽车排放产生的大量CO污染物，控制CO排放对环境变得越来越重要。为了更有效地控制CO的排放，采用溶胶-凝胶法制备了以HZSM-5沸石为载体的LaMnO ₃钙钛矿催化剂。对催化剂的结构和催化活性进行了表征和分析。根据X射线衍射（XRD）和能量色散X射线光谱（EDS）的结果，在所有负载型催化剂中均成功获得了LaMnO ₃钙钛矿相。负载型催化剂的平均粒径在 15-38 μm 范围内。与负载在其他类型载体上的钙钛矿催化剂相比，LaMnO ₃HZSM-5 支持具有更大的比表面积 (SSA)。负载量不同的负载型催化剂的SSA在190-300 m ² /g范围内。HZSM-5 载体提高了 LaMnO ₃的催化活性增加 SSA 的催化剂。当负载量从 20% 增加到 60% 时，负载型催化剂的活性变得更高。负载 60% 钙钛矿的催化剂在 CO 催化氧化中表现出最好的活性。60LM/HZSM-5 的 CO 转化率在 172.7°C 和 201.5°C 下分别达到 50% 和 90%。钙钛矿负载量 80% 和 100% 的催化剂的活性由于过多的钙钛矿形成的堆积孔而降低。负载型催化剂在连续反应循环中表现出良好的活性。事实证明，HZSM-5 载体适用于合成用于 CO 氧化的活性钙钛矿催化剂。