Non-conventional low-temperature reverse water–gas shift reaction over highly dispersed Ru catalysts in an electric field

Ryota Yamano, Shuhei Ogo, Naoya Nakano, Takuma Higo, Yasushi Sekine*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

The reverse water–gas shift (RWGS) reaction, a promising carbon-recycling reaction, was investigated by applying an electric field to promote the reaction at a temperature of 473 K or lower. The highly dispersed Ru/ZrTiO4 catalysts with an approximately 2 nm particle size of Ru showed high RWGS activity with a DC electric field below 473 K, whereas CO2 methanation proceeded predominantly over catalysts with larger Ru particles. The RWGS reaction in the electric field maintained high CO selectivity, suppressing CO hydrogenation into CH4 on the Ru surface by virtue of promoted hydrogen migration (surface protonics). The reaction mechanisms of the non-conventional low-temperature reverse water gas shift reaction were investigated and revealed using various characterization methods including in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) measurements. With the DC electric field, the reaction proceeds via a redox reaction where the generated oxygen vacancies are involved in CO2 activation at low temperatures. As a result, the electric field promotes both hydrogen migration and redox reactions using lattice oxygen/ vacancies, resulting in high RWGS activity and selectivity even at low temperatures.

Original languageEnglish
Pages (from-to)125-133
Number of pages9
JournalEES Catalysis
Volume1
Issue number2
DOIs
Publication statusPublished - 2023 Mar 1

ASJC Scopus subject areas

  • Catalysis
  • Chemistry (miscellaneous)
  • Electrochemistry
  • Physical and Theoretical Chemistry
  • Fuel Technology
  • Renewable Energy, Sustainability and the Environment

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