Catalytic behavior of metal catalysts in high-temperature RWGS reaction: In-situ FT-IR experiments and first-principles calculations

Sungjun Choi, Byoung In Sang, Jongsup Hong, Kyung Joong Yoon, Ji Won Son, Jong Ho Lee, Byung Kook Kim, Hyoungchul Kim

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36 Citations (Scopus)

Abstract

High-temperature chemical reactions are ubiquitous in (electro) chemical applications designed to meet the growing demands of environmental and energy protection. However, the fundamental understanding and optimization of such reactions are great challenges because they are hampered by the spontaneous, dynamic, and high-temperature conditions. Here, we investigated the roles of metal catalysts (Pd, Ni, Cu, and Ag) in the high-temperature reverse water-gas shift (RWGS) reaction using in-situ surface analyses and density functional theory (DFT) calculations. Catalysts were prepared by the deposition-precipitation method with urea hydrolysis and freeze-drying. Most metals show a maximum catalytic activity during the RWGS reaction (reaching the thermodynamic conversion limit) with formate groups as an intermediate adsorbed species, while Ag metal has limited activity with the carbonate species on its surface. According to DFT calculations, such carbonate groups result from the suppressed dissociation and adsorption of hydrogen on the Ag surface, which is in good agreement with the experimental RWGS results.

Original languageEnglish
Article number41207
JournalScientific reports
Volume7
DOIs
Publication statusPublished - 2017 Jan 25

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Publisher Copyright:
© 2017 The Author(s).

All Science Journal Classification (ASJC) codes

  • General

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