Preparation of Mn-Ce composite oxide microspheres and their performance on toluene catalytic oxidation [Mn-Ce复合氧化物微球的制备及其催化氧化甲苯性能]

作者：Yu C.; Yang W.; Xia L.; Wu J.; Mao S.; Hu L.; Fu C.; Lu M.^*

来源：Chinese Journal of Environmental Engineering, 2020, 14(6): 1554-1562.

DOI：10.12030/j.cjee.201908016

• Catalytic oxidation
• Mn-Ce composite oxides
• Solid solution
• Toluene

In order to develop high-efficient, stable and low temperature active catalytic materials for VOCs degradation, a series of Mn-Ce catalysts with various Mn/Ce mole ratios (MnO2, Mn0.95Ce0.05Ox, Mn0.90Ce0.10Ox, Mn0.80Ce0.20Ox & Mn 0.60Ce0.40Ox) were prepared by a traditional hydrothermal synthesis method. The physicochemical properties of these catalysts were characterized and analyzed by SEM, BET, XRD, H2-TPR, O2-TPD and Raman spectroscopy, and their catalytic oxidation of toluene was investigated. The results indicated that Mn-Ce composite oxides prepared by simple hydrothermal synthesis method were microspheres, while Ce addition caused the disappearance of the nano-needle borne on the catalyst surfaces and the formation of smooth microspheres. The catalysts with various Mn/Ce mole ratios exhibited different catalytic activity for toluene oxidation, of which Mn0.80Ce0.20Ox had the best performance, this was ascribed to its strong redox properties, high chemisorbed-oxygen content and the existence of Mn-Ce solid solution. Thus, the morphology and physicochemical properties of the catalysts could be regulated by controlling the Ce content, which enabled these Mn-Ce composite oxides to exhibit excellent catalytic performance in toluene oxidation. This study provided a new idea for the design and development of novel VOCs catalytic materials with high efficiency.

• 单位
  华南理工大学