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<p>The ammonia synthesis reaction over Ni<sub>2</sub>Mo<sub>3</sub>N was carried out at 400&#xa0;°C and atmospheric pressure. The effects of the H<sub>2</sub>:N<sub>2</sub> ratio on both nitridation and the ammonia synthesis reaction steps were investigated. Analysis of Ni<sub>2</sub>Mo<sub>3</sub>N samples nitrided at different H<sub>2</sub>:N<sub>2</sub> ratios was performed using XRD and elemental analysis. The surface characteristics of Ni<sub>2</sub>Mo<sub>3</sub>N were determined using H<sub>2</sub>-TPR. When Ni<sub>2</sub>Mo<sub>3</sub>N was nitrided under 3:1 H<sub>2</sub>:N<sub>2</sub>, it was observed that a lower hydrogen ratio of 0.5:1 H<sub>2</sub>:N<sub>2</sub> during the catalytic test improved the performance slightly. It is believed that the H<sub>2</sub> poisoning effect decreases at lower H<sub>2</sub>:N<sub>2</sub> ratios. The highest ammonia synthesis activity was observed over a Ni<sub>2</sub>Mo<sub>3</sub>N catalyst when nitrided under 0.5:1 H<sub>2</sub>:N<sub>2</sub> when ammonia synthesis reaction was performed using a 3:1 H<sub>2</sub>:N<sub>2</sub> reaction mixture. The reason can be the presence of metallic Ni in the catalyst structure, which is believed to facilitate H<sub>2</sub> spillover to reaction medium.</p>

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The effect of the H2:N2 pre-treatment and reactant ratio upon the ammonia synthesis performance of the Ni2Mo3N catalyst

  • 期刊论文

  • 发表日期：

    2025年4月8日

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  • Mustafa Y. Aslan,
  • Angela Daisley,
  • Justin S. J. Hargreaves

摘要

The ammonia synthesis reaction over Ni2Mo3N was carried out at 400 °C and atmospheric pressure. The effects of the H2:N2 ratio on both nitridation and the ammonia synthesis reaction steps were investigated. Analysis of Ni2Mo3N samples nitrided at different H2:N2 ratios was performed using XRD and elemental analysis. The surface characteristics of Ni2Mo3N were determined using H2-TPR. When Ni2Mo3N was nitrided under 3:1 H2:N2, it was observed that a lower hydrogen ratio of 0.5:1 H2:N2 during the catalytic test improved the performance slightly. It is believed that the H2 poisoning effect decreases at lower H2:N2 ratios. The highest ammonia synthesis activity was observed over a Ni2Mo3N catalyst when nitrided under 0.5:1 H2:N2 when ammonia synthesis reaction was performed using a 3:1 H2:N2 reaction mixture. The reason can be the presence of metallic Ni in the catalyst structure, which is believed to facilitate H2 spillover to reaction medium.