• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Nanotechnology >The dynamic behaviour of CH_3OH and NO_2 adsorbed on CeO_2 (111) studied by noncontact atomic force microscopy
【24h】

The dynamic behaviour of CH_3OH and NO_2 adsorbed on CeO_2 (111) studied by noncontact atomic force microscopy

机译：非接触原子力显微镜研究CH_3OH和NO_2吸附在CeO_2（111）上的动力学行为

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The adsorption and reaction of methanol (CH_3OH) and nitrogen dioxide (NO_2) on CeO_2(111) surfaces in different oxidation states were studied by noncontact atomic force microscopy (NC-AFM). After CH_3OH exposure, surface oxygen defects without reconstruction of the surrounding oxygen atoms were healed by methoxy species (CH_3O). Under a CH_3OH atmosphere, a heterogeneous feature in the reactivity of surface oxygen atoms to CH_3OH was observed by successive NC-AFM observation: new line defects of oxygen were produced as a result of a chemical event. Successive NC-AFM measurements also revealed that oxygen vacancies on a slightly reduced CeO_2 (111) surface were healed by exposure to NO_2. The contrast of healed oxygen defects in NC-AFM images was similar to that of other surface oxygen atoms. This indicates that dissociative adsorption of NO_2 occurred at the defects. Nitrogen trioxide (NO_3) was also observed on a slightly reduced CeO_2(111) surface after NO_2 exposure. On a CeO_2(111) surface without surface oxygen defects, neither adsorption of NO_2 nor formation of NO_3 was observed. The reaction mechanisms for the formation of line defects and NO_3 are discussed briefly.
机译：采用非接触原子力显微镜（NC-AFM）研究了甲醇（CH_3OH）和二氧化氮（NO_2）在CeO_2（111）表面上在不同氧化态下的吸附和反应。暴露于CH_3OH后，表面氧基缺陷（未重建周围的氧原子）被甲氧基物质（CH_3O）修复。在CH_3OH气氛下，通过连续的NC-AFM观察到了表面氧原子与CH_3OH的反应性的异质性特征：由于化学事件而产生了新的氧线缺陷。连续的NC-AFM测量还显示，通过暴露于NO_2，CeO_2（111）略微减少的表面上的氧空位已得到治愈。 NC-AFM图像中已修复氧缺陷的对比度与其他表面氧原子相似。这表明在缺陷处发生了NO_2的解离吸附。暴露NO_2后，在稍微还原的CeO_2（111）表面上也观察到三氧化二氮（NO_3）。在没有表面氧缺陷的CeO_2（111）表面上，未观察到NO_2的吸附或NO_3的形成。简要讨论了形成线缺陷和NO_3的反应机理。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号