The Enhanced Catalytic Activity of N-Doped OMS-2 Catalyst for Direct Decomposition of N2O

IF 2.5 4区化学 Q3 CHEMISTRY, PHYSICAL

Catalysis Letters Pub Date : 2026-10-07 DOI:10.1007/s10562-026-05541-y

Ruifang Wu, Hui Dang, Ziying Su, Chengming Zhang, Xiangqian Lin, Ke Zheng, Liangliang Zhang, Yongzhao Wang

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Abstract

A series of N-doped OMS-2 catalyst were prepared by a simple and mild one-step sol-gel method using urea as nitrogen dopant, and were tested for catalytic decomposition of N₂O. The addition of N improved catalytic activity of pure OMS-2, and N₁-OMS-2 catalyst exhibited optimal catalytic performance. For N₁-OMS-2 catalyst, N was successfully doped into the OMS-2 lattice, which although did not induce obvious change of crystal structure and morphology of OMS-2, resulted in slight increase of specific surface area, more abundant oxygen vacancies and enhanced surface basicity. These changes facilitated adsorption and activation of N₂O molecules. Meanwhile, N-doping also weakened the Mn-O bonds, promoting the desorption of oxygen species. All these factors endowed N₁-OMS-2 with a lower E_a for N₂O decomposition. As a result, the complete conversion temperature of N₂O over N₁-OMS-2 was 60 ℃ lower than that over pure OMS-2. Moreover, N₁-OMS-2 displayed a good stability under the reaction condition of 1000 ppm N₂O+3vol% O₂ + 3.3vol% H₂O mixed gas. Overall, this study offered a facile and promising proposal to obtain high-performance OMS-2 catalyst for catalytic decomposition of N₂O.

Graphical Abstract

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n掺杂OMS-2催化剂对N2O直接分解催化活性的增强

以尿素为氮掺杂剂，采用简单温和的一步溶胶-凝胶法制备了一系列n掺杂OMS-2催化剂，并对其催化分解N2O的性能进行了测试。N的加入提高了纯OMS-2的催化活性，N1-OMS-2催化剂表现出最佳的催化性能。对于N1-OMS-2催化剂，成功地将N掺杂到OMS-2晶格中，虽然没有引起OMS-2晶体结构和形貌的明显变化，但导致比表面积略有增加，氧空位更丰富，表面碱度增强。这些变化促进了N2O分子的吸附和活化。同时，n掺杂也削弱了Mn-O键，促进了氧的解吸。这些因素都使N1-OMS-2具有较低的N2O分解Ea。结果表明，N2O在N1-OMS-2上的完全转化温度比在纯OMS-2上的完全转化温度低60℃。此外，N1-OMS-2在1000 ppm N2O+3vol% O2 + 3.3vol% H2O的混合气体条件下表现出良好的稳定性。总的来说，本研究为获得高性能的OMS-2催化剂催化分解N2O提供了一个简单而有前途的建议。图形抽象

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来源期刊

Catalysis Letters 化学-物理化学

CiteScore

5.70

自引率

3.60%

发文量

327

审稿时长

1 months

期刊介绍： Catalysis Letters aim is the rapid publication of outstanding and high-impact original research articles in catalysis. The scope of the journal covers a broad range of topics in all fields of both applied and theoretical catalysis, including heterogeneous, homogeneous and biocatalysis. The high-quality original research articles published in Catalysis Letters are subject to rigorous peer review. Accepted papers are published online first and subsequently in print issues. All contributions must include a graphical abstract. Manuscripts should be written in English and the responsibility lies with the authors to ensure that they are grammatically and linguistically correct. Authors for whom English is not the working language are encouraged to consider using a professional language-editing service before submitting their manuscripts.