Elucidation of catalytic NOx reduction mechanism in an electric field at low temperatures

Ayaka Shigemoto, Takuma Higo, Yuki Narita, Seiji Yamazoe, Toru Uenishi, Yasushi Sekine*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

As automobiles increasingly become electrically driven and as more engines and motors are used together, the exhaust temperatures of internal combustion engines are decreasing. Further improvement of exhaust gas purification catalyst performance is necessary. To purify nitrogen oxides, unburned hydrocarbons, and carbon monoxide simultaneously at low temperatures, electrothermal heating and plasma catalysis have been proposed, but these methods require high power consumption. Results of this study indicate that a direct current electric field applied to a Pd-supported catalyst shows high purification rates even at temperatures lower than 473 K under TWC conditions (NO-CO-C3H6-O2-H2O). For clarifying the reaction mechanism in this process, the adsorption of reactants was evaluated using in situ DRIFTS measurements in an electric field. Factors that improve the activity at low temperatures in the electric field were clarified.

Original languageEnglish
JournalCatalysis Science and Technology
DOIs
Publication statusAccepted/In press - 2022

ASJC Scopus subject areas

  • Catalysis

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