Key role of NO + C3H8 reaction for the elimination of NO in automobile exhaust by three-way catalyst

  • Yusheng Chen
  • Jie Deng
  • Jun Fan
  • Yi Jiao
  • Jianli WangEmail author
  • Yaoqiang ChenEmail author
Research Article


Pd-only three-way catalysts with improved catalytic activity for NO elimination were prepared. In order to explore the catalytic reaction rules of NO reduction under a three-way catalytic system, a series of single reactions related to NO reduction were evaluated. It was found that the reaction temperatures of NO + H2 or NO + CO or NO + C3H6 reactions were below 250 °C, while that of NO + C3H8 was up to 350 °C. Thus, the reaction NO + C3H8 served as the key reaction in determining the purification efficiency of NO at the high-temperature stage. By in situ FTIR, we proposed that three possible steps were involved in NO + C3H8 reaction. The first step was the oxidation of C3H8 and NO to acetone and nitrate species by active oxygen species, respectively (C3H8 + O* → C3H6O, NO + O* → NO3). XPS results revealed that the amount of active oxygen species in Pd/CeO2-ZrO2-Al2O3 (Pd/CZA, 73.7%) was much higher than that in Pd/CexZr1−xO2+Al2O3 (Pd/CZ+A, 64.1%). This was in line with the higher reaction efficiency of the first step over Pd/CZA. Then the NO + C3H8 reaction was accelerated by the first step, which consequently contributed to the higher NO elimination efficiency of Pd/CZA.


Three-way catalyst NO elimination Single reaction Reaction steps Active oxygen species 


Funding information

We gratefully acknowledge the National Key Research and Development Program of China (2016YFC0204903) for their generous financial support to our research.

Supplementary material

11356_2019_5834_MOESM1_ESM.docx (234 kb)
ESM 1 (DOCX 234 kb)


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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.College of ChemistrySichuan UniversityChengduChina
  2. 2.Institute of New Energy and Low-Carbon TechnologySichuan UniversityChengduChina
  3. 3.National Engineering Research Center for Flue Gas DesulfurizationSichuan UniversityChengduChina

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