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<p>In this study, nitrogen-doped mesoporous carbon (NDC) and vanadium-doped (V₂O₅/NDC) catalysts were synthesized and systematically investigated for low-temperature selective catalytic reduction (SCR) of NOₓ with NH₃. Undoped mesoporous carbon (MPC) exhibited poor NOₓ conversion (&lt; 10%) over 80–350&#xa0;°C. In contrast, NDC catalysts showed significantly enhanced performance, achieving &gt; 40% NOₓ conversion with high N₂ selectivity (&gt; 95%) between 170 and 290&#xa0;°C, with NDC1.5 reaching ~ 95% conversion at 230&#xa0;°C. To further optimize activity, V₂O₅ (1–10 wt%) was loaded onto NDC1. The optimal 7VNDC1 catalyst achieved &gt; 90% NOₓ conversion (98% at 230&#xa0;°C) and 95% N₂ selectivity across 200–290&#xa0;°C. Moreover, 7VNDC1 demonstrated excellent durability, maintaining 92% NOₓ conversion and 99% N₂ selectivity over 12&#xa0;h at 200&#xa0;°C. Physicochemical characterizations revealed high surface areas (1191–1804&#xa0;m²/g) and mesoporosity favorable for gas adsorption. They also confirmed successful N-doping, predominantly as pyrrolic nitrogen (N-5), and homogeneous dispersion of vanadium species, which synergistically improved redox properties. In-situ DRIFTS studies revealed that both Langmuir-Hinshelwood and Eley-Rideal mechanisms operate at 200&#xa0;°C, with Eley-Rideal being dominant. Overall, this work demonstrates that V₂O₅-loaded NDC is a highly effective, stable low-temperature SCR catalyst, offering a promising route for NOₓ mitigation with minimal secondary emissions.</p> Graphical Abstract <p></p>

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Synergistic NOx Elimination at Low Temperature by Metal Oxide/ Nitrogen Doped Mesoporous Carbon Catalyst

  • 期刊论文

  • 发表日期：

    2026年7月3日

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  • Ajit Dattatray Phule,
  • Sung Min Park,
  • Ji Young Park,
  • Nuri Sagong,
  • Jae Hwan Yang

摘要

In this study, nitrogen-doped mesoporous carbon (NDC) and vanadium-doped (V₂O₅/NDC) catalysts were synthesized and systematically investigated for low-temperature selective catalytic reduction (SCR) of NOₓ with NH₃. Undoped mesoporous carbon (MPC) exhibited poor NOₓ conversion (< 10%) over 80–350 °C. In contrast, NDC catalysts showed significantly enhanced performance, achieving > 40% NOₓ conversion with high N₂ selectivity (> 95%) between 170 and 290 °C, with NDC1.5 reaching ~ 95% conversion at 230 °C. To further optimize activity, V₂O₅ (1–10 wt%) was loaded onto NDC1. The optimal 7VNDC1 catalyst achieved > 90% NOₓ conversion (98% at 230 °C) and 95% N₂ selectivity across 200–290 °C. Moreover, 7VNDC1 demonstrated excellent durability, maintaining 92% NOₓ conversion and 99% N₂ selectivity over 12 h at 200 °C. Physicochemical characterizations revealed high surface areas (1191–1804 m²/g) and mesoporosity favorable for gas adsorption. They also confirmed successful N-doping, predominantly as pyrrolic nitrogen (N-5), and homogeneous dispersion of vanadium species, which synergistically improved redox properties. In-situ DRIFTS studies revealed that both Langmuir-Hinshelwood and Eley-Rideal mechanisms operate at 200 °C, with Eley-Rideal being dominant. Overall, this work demonstrates that V₂O₅-loaded NDC is a highly effective, stable low-temperature SCR catalyst, offering a promising route for NOₓ mitigation with minimal secondary emissions.

Graphical Abstract