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<p>Selective catalytic reduction of NO<sub><i>x</i></sub> with ammonia as a reductant (NH<sub>3</sub>-SCR) is widely used for deNO<sub><i>x</i></sub> treatment in both mobile exhaust systems and industrial plants. However, ammonia is easily affected by SO<sub><i>x</i></sub>, forming ammonium sulfate, especially at low temperatures, which leads to catalyst deactivation, pipe blockage, and corrosion of equipment. Low-carbon alcohols, such as methanol and ethanol, have emerged as alternative reducing agents due to their inertness towards SO<sub><i>x</i></sub>. This review systematically summarizes recent advances in SCR deNO<sub><i>x</i></sub> technology using low-carbon alcohols as reductants (Alcohol-SCR), with a focus on catalyst design and performance optimization strategies involving zeolites, metal oxides, and other support materials. It further elucidates the reaction mechanisms and intermediate transformation pathways in various Alcohol-SCR systems, summarizes the prevailing technical challenges, and outlines prospective research directions, including the development of novel catalysts, a deeper understanding of reaction mechanisms, and exploration of industrial applicability.</p>

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Selective catalytic reduction of NOx with alcohols as reductants: recent progress and future perspectives

  • 期刊论文

  • 发表日期：

    2025年6月5日

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  • Dekai Liu,
  • Han Sun,
  • Ziying Hong,
  • Haodan Cheng,
  • Haijun Chen

摘要

Selective catalytic reduction of NOx with ammonia as a reductant (NH3-SCR) is widely used for deNOx treatment in both mobile exhaust systems and industrial plants. However, ammonia is easily affected by SOx, forming ammonium sulfate, especially at low temperatures, which leads to catalyst deactivation, pipe blockage, and corrosion of equipment. Low-carbon alcohols, such as methanol and ethanol, have emerged as alternative reducing agents due to their inertness towards SOx. This review systematically summarizes recent advances in SCR deNOx technology using low-carbon alcohols as reductants (Alcohol-SCR), with a focus on catalyst design and performance optimization strategies involving zeolites, metal oxides, and other support materials. It further elucidates the reaction mechanisms and intermediate transformation pathways in various Alcohol-SCR systems, summarizes the prevailing technical challenges, and outlines prospective research directions, including the development of novel catalysts, a deeper understanding of reaction mechanisms, and exploration of industrial applicability.