等离子体场内CeO2催化降解甲醇的表面活性氧物种来源与作用研究

作者：Wang Xueqing; Li Huanyi; Wang Bangfen; Sun Yuhai; Mao Mengqi; Wu Junliang^*; Fu Mingli; Chen Limin; Ye Daiqi

来源：Acta Scientiae Circumstantiae, 2019, 39(8): 2725-2734.

DOI：10.13671/j.hjkxxb.2019.0035

• CeO2
• Methanol
• Non-thermal plasma
• Source and role
• Surface reactive oxygen species

CeO2 with different morphologies (i.e. rod, particle, and cube) were prepared by a hydrothermal method and characterized by Brunauer-Emmett-Teller (BET), scanning electron microscopy (SEM), Raman and oxygen temperature-programmed desorption (O2-TPD). The CeO2 rod catalyst presents the most surface oxygen species and oxygen vacancies. Then the catalysts were tested for methanol oxidation in plasma. The CeO2 rod exhibited the highest removal efficiency and CO2 selectivity. Experiments (methanol-TPD, catalytic reaction in different background gas at room temperature, comparison of in-plasma catalysis (IPC) and post-plasma catalysis (PPC), O3 catalytic oxidation) were further carried out to determine the sources and roles of surface active oxygen species over CeO2 in the plasma. Two sources of surface active oxygen species were involved in surface catalysis. One was the surface oxygen species present in the catalyst itself, the other was the short-lived species and long-lived species (mainly O3) in the plasma region. The oxygen species from O3 decomposition played the most important role in improving catalytic performance. Different morphologies of CeO2 had different amounts of oxygen vacancies, which led to different amounts of surface reactive oxygen species generated by O3 decomposition, which ultimately affected the performance of plasma-catalytic system. ? 2019, Science Press. All right reserved.

• 出版日期2019
• 单位华南理工大学