Nature of Reactive Oxygen Intermediates on Copper-Promoted Iron–Chromium Oxide Catalysts during CO2 Activation,ACS Catalysis

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Nature of Reactive Oxygen Intermediates on Copper-Promoted Iron–Chromium Oxide Catalysts during CO2 Activation
ACS Catalysis ( IF 11.3 ) Pub Date : 2020-06-18 , DOI: 10.1021/acscatal.0c01311
Minghui Zhu ₁ , Pengfei Tian ₁ , Michael E. Ford ₂ , Jiacheng Chen ₁ , Jing Xu ₁ , Yi-Fan Han ₁ , Israel E. Wachs ₂

Affiliation

A series of copper-promoted iron–chromium oxide catalysts with various copper loadings are investigated for CO₂ activation (reverse water–gas shift reaction) to determine the nature of surface oxygen intermediates involved in this redox reaction. Using a series of in situ characterizations (XPS, HS-LEIS, DRIFTS, and EXAFS), H₂-TPR, and transient kinetic analysis, two reactive surface oxygen species with different reduction characteristics are identified for catalysts during the reaction. The more abundant and more active surface oxygen species are closely related to the surface hydroxyls located at the Cu-Fe₃O₄ interfacial regions. A direct correlation of the CO₂ hydrogenation reaction rate with both the number and reduction kinetics of the more active surface oxygen intermediates is established.

中文翻译：

CO ₂活化过程中铜促进的铁铬氧化物催化剂上活性氧中间体的性质

研究了一系列具有多种铜负载量的铜助铁氧化铬催化剂的CO ₂活化（水煤气逆反应），以确定参与该氧化还原反应的表面氧中间体的性质。使用一系列原位表征（XPS，HS-LEIS，DRIFTS和EXAFS），H ₂ -TPR和瞬态动力学分析，在反应过程中为催化剂鉴定了两种具有不同还原特性的反应性表面氧。更丰富和更活跃的表面氧种类与位于Cu-Fe ₃ O ₄界面区域的表面羟基密切相关。CO _2的直接相关建立了具有更活泼的表面氧中间体的氢化反应速率和还原动力学。

更新日期：2020-07-17

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