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<p>Nitrous oxide (N<sub>2</sub>O) is a strong greenhouse gas and an important ozone-depleting species. Direct catalytic decomposition is an attractive removal route because it does not require an external reductant and ideally produces only N<sub>2</sub> and O<sub>2</sub>. In real exhaust streams, however, N<sub>2</sub>O is often accompanied by NO, which can strongly lower catalytic activity by competing for active sites, forming NO<sub>x</sub>-derived surface species, hindering oxygen migration, and slowing active-site regeneration. This review summarizes recent progress in direct N<sub>2</sub>O decomposition under NO-containing conditions, with emphasis on inhibition mechanisms, catalyst evaluation, and catalyst design for improved NO resistance. The discussion is organized by catalyst function rather than by material type, including suppression of stable NO<sub>x</sub> adsorption, promotion of oxygen migration and site recovery, control of local active-site structure, and multifunctional systems that provide mechanistic insights into NO transformation during NO-tolerant N<sub>2</sub>O decomposition. The review also discusses current challenges in mechanistic studies under working conditions, testing under realistic gas feeds, long-term stability, regeneration, and practical implementation. It aims to provide a clearer basis for designing catalysts with better NO tolerance.</p>

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Direct Catalytic Decomposition of N2O under NO-Coexisting Conditions: Inhibition Mechanisms, NO-tolerant Strategies, and Catalyst Design

  • 期刊论文

  • 发表日期：

    2026年6月22日

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  • Lijing Fang,
  • Yan Zhang,
  • Zongxiang Yang,
  • Caixia Liu,
  • Qian Zhao,
  • Rui Han,
  • Qingling Liu

摘要

Nitrous oxide (N2O) is a strong greenhouse gas and an important ozone-depleting species. Direct catalytic decomposition is an attractive removal route because it does not require an external reductant and ideally produces only N2 and O2. In real exhaust streams, however, N2O is often accompanied by NO, which can strongly lower catalytic activity by competing for active sites, forming NOx-derived surface species, hindering oxygen migration, and slowing active-site regeneration. This review summarizes recent progress in direct N2O decomposition under NO-containing conditions, with emphasis on inhibition mechanisms, catalyst evaluation, and catalyst design for improved NO resistance. The discussion is organized by catalyst function rather than by material type, including suppression of stable NOx adsorption, promotion of oxygen migration and site recovery, control of local active-site structure, and multifunctional systems that provide mechanistic insights into NO transformation during NO-tolerant N2O decomposition. The review also discusses current challenges in mechanistic studies under working conditions, testing under realistic gas feeds, long-term stability, regeneration, and practical implementation. It aims to provide a clearer basis for designing catalysts with better NO tolerance.