Stability of Cobalt Particles In and Outside HZSM‐5 under CO Hydrogenation Conditions Studied by ex situ and in situ Electron Microscopy,ChemCatChem

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Stability of Cobalt Particles In and Outside HZSM‐5 under CO Hydrogenation Conditions Studied by ex situ and in situ Electron Microscopy
ChemCatChem ( IF 3.8 ) Pub Date : 2020-10-31 , DOI: 10.1002/cctc.202001533
Angela Straß‐Eifert ₁ , Thomas L. Sheppard _{2,

3} , Christian D. Damsgaard ₄ , Jan‐Dierk Grunwaldt _{2,

3} , Robert Güttel ₁

Affiliation

Designing stable materials for processes operating under harsh reaction conditions, like CO hydrogenation, is a challenging topic in catalysis. These may provoke several deactivation mechanisms simultaneously, like thermal sintering, oxidation or poisoning of the active sites. We report HZSM‐5 supported cobalt catalysts, exhibiting cobalt nanoparticles encapsulated inside, or located at the exterior of the ZSM‐5 support. The materials were studied by a combination of ex situ and in situ electron microscopy with respect to the growth of the cobalt particles. After 1200 h time on stream under CO hydrogenation conditions, the spent catalyst showed minimal sintering of encapsulated cobalt particles. In situ environmental TEM experiments under model reduction and CO hydrogenation conditions indicate the presence of cobalt nanoparticles, which appear highly resistant towards sintering even up to 700 °C. These results provide a first indication for the preparation of sinter stable catalysts suitable for operating in harsh reaction environments.

中文翻译：

异位和原位电子显微镜研究CO加氢条件下HZSM-5内外钴颗粒的稳定性

在苛刻的反应条件下（例如CO加氢）为操作过程设计稳定的材料是催化领域中一个具有挑战性的主题。这些可能同时引发几种失活机理，例如热烧结，活性部位的氧化或中毒。我们报告了HZSM-5负载的钴催化剂，表现出封装在ZSM-5载体内部或外部的钴纳米粒子。通过异位和原位电子显微镜相结合的方法研究了钴颗粒的生长。在CO加氢条件下运行1200小时后，用过的催化剂显示出对包封的钴颗粒的烧结最少。原位在模型还原和CO加氢条件下进行的环境TEM实验表明，存在钴纳米颗粒，即使在700°C的高温下，它们也具有很高的抗烧结性。这些结果为制备适用于苛刻反应环境的烧结稳定的催化剂提供了第一个指示。

更新日期：2020-10-31

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