Catalytic ozonation stands out as a promising technology for volatile organic compounds (VOCs)degradation. Two polyacrylonitrile (PANF) fiber-supported catalysts, MnO/APANF and MnO/CPANF, were synthesized by depositing MnO nanoparticles onto amino-rich and carboxylic-rich fibers, respectively. The catalytic activity of these catalysts in toluene ozonation was systematically examined. MnO/APANF exhibited superior catalytic activity compared to MnO/CPANF, attributed to its higher Mn content, a greater Mn/Mn ratio, and a more abundant alkaline microenvironment, achieved with the assistance of amino groups. MnO/APANF achieved 100% toluene conversion at a relatively low temperature of 100 °C, with the production rate of dominant organic by-products at only 0.08% and 0.53% for MnO/APANF and MnO/CPANF, respectively. Notably, MnO/APANF exhibited remarkable stability, maintaining the original toluene conversion efficiency for 660 min at 110 °C. The kinetic study, employing the power-law model, established the reaction order of toluene and ozone, along with the rate constant for the catalytic ozonation of toluene using MnO/APANF. Remarkably, both the reaction order and rate constant demonstrated variations with changes in temperature. These PANF fiber-supported catalysts hold significant potential for a broad range of applications in low-temperature elimination of VOCs.

中文翻译：

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负载MnOx纳米粒子的聚丙烯腈纤维用于甲苯的高效催化臭氧化

催化臭氧化是一种很有前景的挥发性有机化合物 (VOC) 降解技术。通过将 MnO 纳米颗粒分别沉积到富含氨基和富含羧基的纤维上，合成了两种聚丙烯腈（PANF）纤维负载催化剂 MnO/APANF 和 MnO/CPANF。系统地检测了这些催化剂在甲苯臭氧化中的催化活性。与 MnO/CPANF 相比，MnO/APANF 表现出优异的催化活性，这归因于其在氨基的帮助下具有更高的 Mn 含量、更大的 Mn/Mn 比以及更丰富的碱性微环境。MnO/APANF在100℃的相对较低温度下实现了100%甲苯转化，MnO/APANF和MnO/CPANF的主要有机副产物的产率分别仅为0.08%和0.53%。值得注意的是，MnO/APANF表现出显着的稳定性，在110℃下660分钟内仍保持原始的甲苯转化效率。采用幂律模型进行动力学研究，确定了甲苯和臭氧的反应级数，以及使用 MnO/APANF 催化臭氧化甲苯的速率常数。值得注意的是，反应级数和速率常数都随着温度的变化而变化。这些 PANF 纤维负载催化剂在低温消除 VOC 方面具有广泛的应用潜力。