Hu Zihao, Zhou Xiaoying, Zhang Tiantian, Wu Zuliang, Li Jing, Wang Wei, Gao Erhao, Zhu Jiali, Yao Shuiliang
School of Environmental and Safety Engineering, Changzhou University, Changzhou, China.
School of Environmental Science and Engineering, Changzhou University, Changzhou, China.
Dalton Trans. 2024 Oct 22;53(41):16978-16992. doi: 10.1039/d4dt02391a.
Aiming at the problem of the poor performance of an Mn-MOF-74-derived MnO catalyst in low-temperature carbon monoxide (CO) oxidation, copper (Cu) and cerium (Ce) elements were used to modify the MnO catalyst to improve its performance in low-temperature CO oxidation. According to the results of catalytic performance testing, the CO oxidation activity of the CuMnO catalyst was significantly improved compared with that of the pristine MnO catalyst, when a CO conversion rate of 90% was achieved at 118 °C. According to X-ray photoelectron spectroscopy and Brunauer-Emmett-Teller analyses, the (Mn + Mn)/(Mn + Mn + Mn) ratio and the O/O ratio increased after Cu doping, indicating promoted oxygen vacancy generation. In addition, the increased specific surface area was beneficial for the adsorption of reactant molecules and the exposure of active sites. According to H-temperature-programmed reduction characterization, Cu doping significantly enhanced the performance of the CuMnO catalyst during low-temperature redox. Finally, these factors synergistically promoted the degradation of CO over the CuMnO catalyst. In addition, diffuse reflectance Fourier transform infrared spectroscopy results suggested the presence of more terminal-type oxygen, which is essential for the catalytic oxidation of CO on the surface of the CuMnO catalyst. Moreover, the CuMnO catalyst also showed excellent resistance to carbonate, and remarkable stability.
针对源自Mn-MOF-74的MnO催化剂在低温一氧化碳（CO）氧化中性能不佳的问题，采用铜（Cu）和铈（Ce）元素对MnO催化剂进行改性，以提高其在低温CO氧化中的性能。根据催化性能测试结果，与原始MnO催化剂相比，CuMnO催化剂的CO氧化活性显著提高，在118°C时实现了90%的CO转化率。根据X射线光电子能谱和布鲁诺尔-埃米特-泰勒分析，Cu掺杂后（Mn+Mn）/（Mn+Mn+Mn）比值和O/O比值增加，表明氧空位生成得到促进。此外，比表面积的增加有利于反应物分子的吸附和活性位点的暴露。根据H程序升温还原表征，Cu掺杂显著增强了CuMnO催化剂在低温氧化还原过程中的性能。最后，这些因素协同促进了CuMnO催化剂上CO的降解。此外，漫反射傅里叶变换红外光谱结果表明存在更多的端基型氧，这对于CuMnO催化剂表面CO的催化氧化至关重要。此外，CuMnO催化剂还表现出优异的抗碳酸盐性能和显著的稳定性。
