4.6 Article

Introducing a Novel Method for Probing Accessibility, Local Environment, and Spatial Distribution of Oxidative Sites on Solid Catalysts Using Trimethylphosphine

期刊

JOURNAL OF PHYSICAL CHEMISTRY C
卷 126, 期 31, 页码 13213-13223

出版社

AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.2c04114

关键词

-

资金

  1. Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) [358283783, SFB 1333]
  2. German Federal Ministry of Education and Research (BMBF) [031B0345B]

向作者/读者索取更多资源

Trimethylphosphine (TMP) is demonstrated to be a suitable P-31 MAS NMR probe molecule for quantitatively determining the accessibility, environment, and spatial distribution of oxidation-active oxidic metal species on solid catalysts. The oxidation of TMP to trimethylphosphine oxide (TMPO) at oxygen donor sites is demonstrated for copper, manganese, cobalt, and molybdenum oxides.
Trimethylphosphine (TMP) is demonstrated as a suitable P-31 MAS NMR probe molecule for determining accessibility, environment, and spatial distribution of oxidation-active oxidic metal species on solid catalysts quantitatively. It oxidizes to trimethylphos-phine oxide (TMPO) at oxygen donor sites, which is demonstrated for oxides of copper, manganese, cobalt, and molybdenum. At loadings < 2 wt % of Mo a direct quantitative correlation between TMPO quantity and accessible metal oxide content is observed. Exceeding 2 wt % results in a gradual agglomeration and thus decreases the amount of available oxidative sites, probed as a decay of the amount of TMPO formed. Additionally, the spatial distribution of oxides neighboring species could be inferred. The solid TMPO deposited near MoOx species was very sensitive to extra framework aluminum (EFAL) as well as Bronsted acid sites in close proximity, depending on Mo loading. Thus, the TMP method provides unprecedented insights into the surface chemistry of oxidative metal oxide catalysts.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.6
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据