Shi Yashan, Qiu Jing, Xue Ying, Ding Xinmei, Dai Jingyu, Sun Xiaolong, Zhao Ming, Wang Jianli, Chen Yaoqiang
Key Laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064 Sichuan, China.
Key Laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064 Sichuan, China; Center of Engineering of Vehicular Exhaust Gases Abatement, Chengdu 610064 Sichuan, China; Center of Engineering of Environmental Catalytic Material, Chengdu 610064 Sichuan, China.
J Hazard Mater. 2023 Sep 15;458:131947. doi: 10.1016/j.jhazmat.2023.131947. Epub 2023 Jun 29.
Recently, ozone pollution has gradually replaced PM2.5 as the main pollutant affecting air pollution. In this study, we synthesized a series of MnO catalysts by hydrothermal method changing the precursors and tested their activities at different relative humidity, gas volume space velocity of 150,000 h and 5 ppm ozone. Remarkably, MnO-SO prepared with MnSO as precursor showed excellent catalytic ozone decomposition activity, almost completely converting 5 ppm of ozone at different relative humidity ranges. Finally, the most active MnO-SO catalyst was tested for its usability limit at RH= 90%, after 28 h of testing under high humidity conditions, it had retained successfully the complete decomposition of low concentrations of ozone. The catalysts were characterized by XRD, Raman, HRTEM, XPS, BET, HO-TPD and in situ IR NH adsorption. The characterization analysis revealed that the MnO-SO surface could exposed a highly active (101) crystalline surface with high specific surface area, excellent hydrophobicity as well as ozone adsorption capacity, which were highly favorable for ozone decomposition under high humidity conditions. In this work, MnO exhibits good catalytic activity, which provides an additional option for future studies of manganese oxides.
最近，臭氧污染已逐渐取代PM2.5成为影响空气污染的主要污染物。在本研究中，我们通过水热法改变前驱体合成了一系列MnO催化剂，并在不同相对湿度、气体体积空速为150,000 h以及5 ppm臭氧的条件下测试了它们的活性。值得注意的是，以MnSO为前驱体制备的MnO-SO表现出优异的催化臭氧分解活性，在不同相对湿度范围内几乎能将5 ppm的臭氧完全转化。最后，对活性最高的MnO-SO催化剂在RH = 90%的条件下进行了使用极限测试，在高湿度条件下测试28小时后，它成功保持了对低浓度臭氧的完全分解。采用XRD、拉曼、HRTEM、XPS、BET、HO-TPD和原位红外NH吸附对催化剂进行了表征。表征分析表明，MnO-SO表面能够暴露具有高比表面积、优异疏水性以及臭氧吸附能力的高活性(101)晶面，这对高湿度条件下的臭氧分解极为有利。在这项工作中，MnO表现出良好的催化活性，为未来锰氧化物的研究提供了一个额外的选择。
