Particle Size Effect on Hydrogen Cyanide Synthesis with CH<sub>4</sub> and NO over an Alumina-supported Platinum Catalyst

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  • YAMASAKI Tatsuya
    Dept. of Applied Chemistry, Faculty of Engineering, Kyushu University
  • TAKAGAKI Atsushi
    Dept. of Applied Chemistry, Faculty of Engineering, Kyushu University International Institute for Carbon-Neutral Energy Research (WPI-I<sup>2</sup>CNER), Kyushu University
  • SHISHIDO Tetsuya
    Dept. of Applied Chemistry for Environment, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University Elements Strategy Initiative for Catalysts and Batteries, Kyoto University
  • BANDO Kyoko K.
    National Institute of Advanced Industrial Science and Technology (AIST)
  • KODAIRA Tetsuya
    National Institute of Advanced Industrial Science and Technology (AIST)
  • MURAKAMI Junichi
    National Institute of Advanced Industrial Science and Technology (AIST)
  • SONG Jun Tae
    Dept. of Applied Chemistry, Faculty of Engineering, Kyushu University International Institute for Carbon-Neutral Energy Research (WPI-I<sup>2</sup>CNER), Kyushu University
  • NIWA Eiki
    International Institute for Carbon-Neutral Energy Research (WPI-I<sup>2</sup>CNER), Kyushu University
  • WATANABE Motonori
    International Institute for Carbon-Neutral Energy Research (WPI-I<sup>2</sup>CNER), Kyushu University
  • ISHIHARA Tatsumi
    Dept. of Applied Chemistry, Faculty of Engineering, Kyushu University International Institute for Carbon-Neutral Energy Research (WPI-I<sup>2</sup>CNER), Kyushu University

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Other Title
  • アルミナ担持白金触媒を用いたメタンと一酸化窒素によるシアン化水素合成における粒子径効果
  • Particle Size Effect on Hydrogen Cyanide Synthesis with CH₄ and NO over an Alumina-supported Platinum Catalyst

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<p>The particle size effect of platinum nanoparticles on the conversion of methane (CH4) into hydrogen cyanide (HCN) using nitric oxide (NO) as an oxidant over the Pt supported (γ + θ)-alumina was investigated. The Pt catalysts with various average particle size in the range of 1.6 to 4.1 nm were obtained by controlling the loading amount and calcination temperature. Amount of the Pt surface sites was determined by CO titration using a pulse method and the catalytic activity was evaluated under same contact time. In case of the catalysts having small particle size (1.6-3.2 nm) of Pt, NO conversion was lower than the large one. The catalysts having large particle size (4.1-4.2 nm) exhibited high selectivity of HCN reaching 53.5 % at 1.3 % C-based yield at 400 °C over 10 wt% Pt/Al2O3. One of the reasons for higher activity with the larger Pt particles is suppression of the sequential reaction of HCN to carbon dioxide and ammonia which likely proceeded at the interface between metal and support. Pt L3-edge X-ray adsorption fine structure (XAFS) spectra showed that the small particle catalysts were covered with Pt–CN species after the reaction test. In contrast, Pt–CO was observed as main adsorbed species on the large particle catalysts, suggesting that HCN desorption process was facile for the larger Pt particle case.</p>

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