Ammonia Combustion Properties of Copper Oxides-based Honeycomb and Granular Catalysts

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  • HINOKUMA Satoshi
    Interdisciplinary Research Center for Catalytic Chemistry, National Institute of Advanced Industrial Science and Technology (AIST) Div. of Materials Science and Chemistry, Faculty of Advanced Science and Technology, Kumamoto University
  • IWASA Takeshi
    Dept. of Chemistry, Faculty of Science, Hokkaido University Institute for Chemical Reaction Design and Discovery (WPI-ICReDD), Hokkaido University
  • ARAKI Kento
    Dept. of Applied Chemistry and Biochemistry, Graduate School of Science and Technology, Kumamoto University
  • KAWABATA Yusuke
    Dept. of Applied Chemistry and Biochemistry, Graduate School of Science and Technology, Kumamoto University
  • MATSUKI Shun
    Dept. of Applied Chemistry and Biochemistry, Graduate School of Science and Technology, Kumamoto University
  • SATO Tetsuya
    Technical Div., Faculty of Engineering, Kumamoto University
  • KON Yoshihiro
    Interdisciplinary Research Center for Catalytic Chemistry, National Institute of Advanced Industrial Science and Technology (AIST)
  • TAKETSUGU Tetsuya
    Dept. of Chemistry, Faculty of Science, Hokkaido University Institute for Chemical Reaction Design and Discovery (WPI-ICReDD), Hokkaido University
  • SATO Kazuhiko
    Interdisciplinary Research Center for Catalytic Chemistry, National Institute of Advanced Industrial Science and Technology (AIST)
  • MACHIDA Masato
    Div. of Materials Science and Chemistry, Faculty of Advanced Science and Technology, Kumamoto University

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  • 酸化銅系ハニカム触媒と粒状触媒のアンモニア燃焼特性

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Abstract

<p>Although NH3 has been recently regarded as a renewable and/or carbon-free energy source, the use of NH3 fuel is hindered by its high ignition temperature and N2O/NO production. To overcome these problems, catalytic NH3 combustion systems and novel powder (granule) catalysts that showed high activity and low N2O/NO selectivity were previously developed. In this study, we extended our research to investigate the NH3 combustion properties of copper oxides (CuOx)-based honeycomb catalysts (CuOx/Al2O3, CuOx/10Al2O3 · 2B2O3, CuOx/Ag/Al2O3, CuOx/Pt/Al2O3, and so on) for practical applications. Therefore, several monolithic honeycomb catalysts were prepared and their reaction properties were evaluated and compared with those of granular catalysts. The spatial distribution in coated honeycombs before and after thermal aging was examined by the X-ray line analysis technique, which suggested that supported catalysts (thickness of the layers: ca. 100 μm) had homogeneously dispersed CuOx and/or Pt in each catalyst. NH3 combustion properties (activities and selectivities) for honeycomb catalysts were similar to those of the granular catalysts, indicating that their properties were typically independent from the shape of the catalysts. Spectra from X-ray photoelectron spectroscopy were obtained to estimate the fraction of Cu2+/Cu+ for the honeycomb catalysts of CuOx/10Al2O3 · 2B2O3. By density functional theory computations, it was suggested that highly dispersed Ag nanoparticles show a high activity.</p>

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