脱氢
催化作用
原位
铂金
丙烷
无机化学
碳纤维
化学
化学工程
材料科学
有机化学
复合数
工程类
复合材料
作者
Hannah C. Nerl,Milivoj Plodinec,Thomas Götsch,Katarzyna Skorupska,Robert Schlögl,Travis E. Jones,Thomas Lunkenbein
标识
DOI:10.1002/anie.202319887
摘要
The catalytic production of propylene via propane dehydrogenation (PDH) is a key reaction in the chemical industry. By combining operando transmission electron microscopy with density functional theory analysis, we show that the intercalation and ordering of carbon on Pt interstitials to form Pt-C solid solutions is relevant for increasing propylene production. More specifically, we found that at the point of enhanced propylene formation, the structure of platinum nanoparticles is transformed into a transient caesium chloride-type Pt-C polymorph. At more elevated temperatures, the zincblende and rock salt polymorphs seemingly coexist. When propylene production was highest, multiple crystal structures consisting of Pt and carbon were occasionally found to coexist in one individual nanoparticle, distorting the Pt lattice. Catalyst coking was detected at all stages of the reaction, but did initially not affect all particles. These findings could lead to the development of novel synthesis strategies towards tailoring highly efficient PDH catalysts.
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