• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>RSC Advances >Promotional effects of rare earth elements (Sc, Y, Ce, and Pr) on NiMgAl catalysts for dry reforming of methane
【24h】

Promotional effects of rare earth elements (Sc, Y, Ce, and Pr) on NiMgAl catalysts for dry reforming of methane

机译：稀土元素（SC，Y，Ce，Pr）对甲烷干重系镍钨催化剂的促进作用

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

In this work, the promotional effects of rare earth elements (Sc, Y, Ce, and Pr) on NiMgAl catalysts derived from layered double hydroxides were investigated for dry reforming of methane (DRM). It was found that the modified catalysts showed improved catalytic stability and coke resistance, which may result from the following favorable properties: enhanced surface basicity, abundant oxygen vacancies, superior redox properties and highly dispersed Ni particles. Notably, the Ce or Pr modified catalysts showed higher performance than the others. It may be that the addition of Ce or Pr can increase the amount of strong basic sites. Furthermore, the coexistence of redox pairs, like Ce3+/Ce4+ or Pr3+/Pr4+, can contribute to the enhancement of redox properties and formation of oxygen vacancies simultaneously. The high oxygen vacancies and excellent redox properties can significantly help to improve the catalytic stability. In situ diffuse reflectance infrared transform spectroscopy analysis illustrated the details of carbonate species forming during the adsorption of CO2, and the transient studies investigated the dynamic changes of the adsorbed intermediate species during catalysis processes for getting deep insight into the catalytic mechanism. Adding various rare earth elements can lead to different chemical environments and electronic effects of the surface, and it is crucial to investigate how these additives affect the behavior of the catalysts surface and interface, thus, identifying the catalytic mechanism via the elucidation of the promotional effects of these properties on the catalytic performance.
机译：在这项工作中，研究了甲烷（DRM）的干重整，研究了稀土元素（SC，Y，Ce和Pr）对衍生自层次双氢氧化物的镍氢铈催化剂的促进作用。结果发现改性催化剂显示出改善的催化稳定性和焦炭抗性，这可能是由于以下有利性质：增强的表面碱度，充足的氧空位，优异的氧化还原性能和高度分散的Ni颗粒。值得注意的是，Ce或Pr改性催化剂表现比其他催化剂更高。可能是CE或PR的添加可以增加强基本位点的量。此外，氧化还原对的共存，如CE3 + / CE4 +或PR3 + / PR4 +，可以有助于同时增强氧化还原性能和氧空位的形成。高氧空位和优异的氧化还原性能可以显着有助于提高催化稳定性。在原位漫反射率红外变换光谱分析分析说明了在CO 2的吸附过程中形成的碳酸盐物种的细节，瞬态研究在催化机制深入了解催化机制期间对吸附中间体物种的动态变化研究。添加各种稀土元素可导致不同的化学环境和表面的电子效果，研究这些添加剂如何影响催化剂表面和界面的行为，因此，通过阐明促进效应来鉴定催化机制是至关重要的这些性质对催化性能。

著录项

  • 来源
    《RSC Advances》 |2016年第113期|共11页
  • 作者

    Cao Yang; Li Hongrui; Zhang Jianping; Shi Liyi; Zhang Dengsong;

  • 作者单位

    Shanghai Univ Dept Chem Res Ctr Nano Sci &

    Technol Shanghai 200444 Peoples R China;

    Shanghai Univ Dept Chem Res Ctr Nano Sci &

    Technol Shanghai 200444 Peoples R China;

    Shanghai Univ Dept Chem Res Ctr Nano Sci &

    Technol Shanghai 200444 Peoples R China;

    Shanghai Univ Dept Chem Res Ctr Nano Sci &

    Technol Shanghai 200444 Peoples R China;

    Shanghai Univ Dept Chem Res Ctr Nano Sci &

    Technol Shanghai 200444 Peoples R China;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
  • 关键词

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