文献类型：期刊文献

英文题名：Na-Doped Cobalt-Based γ-Al2O3 Catalysts with Enhanced Electronic Modulation for High NO Selectivity in N2O Decomposition

作者：Han, Yujian[1];He, Muqian[1];Wang, Xuguang[1];Chen, Qian[1];Liu, Dianhua[1]

机构：[1]East China Univ Sci & Technol, Engn Res Ctr Large Scale Reactor Engn & Technol, Sch Chem Engn, Minist Educ, Shanghai 200237, Peoples R China

年份：2025

卷号：64

期号：47

起止页码：22563

外文期刊名：INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH

收录：;EI(收录号：20261520498000);WOS:【SCI-EXPANDED(收录号:WOS:001616543300001)】；

语种：英文

外文关键词：Aluminum oxide - Catalyst activity - Catalyst selectivity - Cobalt - Cobalt compounds - Decomposition - Doping (additives) - Electron transitions - Electron transport properties - Greenhouse gases - Nitric acid - Nitric oxide - Nitrogen oxides - Sodium compounds - Surface reactions

摘要：Nitrous oxide (N2O), recognized as both a potent greenhouse gas and an ozone-depleting substance, has become a focal point for environmental research, driving the urgent need for efficient decomposition strategies. This study innovatively introduces an advanced catalytic system for direct N2O decomposition, which selectively transforms N2O into nitric oxide (NO) at elevated temperatures ranging from 600 to 900 degrees C. This conversion provides a valuable feedstock for subsequent nitric acid synthesis, thereby creating a novel pathway that seamlessly integrates environmental protection with economic benefits for N2O mitigation. Cobalt-based catalysts supported on gamma-Al2O3 were meticulously prepared using the wet-impregnation method and further optimized through the introduction of Fe and Na modifiers. The experimental results demonstrate that across the 600-900 degrees C temperature range, all prepared catalysts achieved complete conversion of N2O. Among them, the Na-doped modified catalyst exhibited the most outstanding performance, attaining a remarkable NO selectivity of 4.28% at 900 degrees C. The incorporation of Na triggered electron-transfer processes, effectively weakening the N-O bond within N2O molecules and facilitating the formation of oxygen species adsorbed on the active sites of the catalyst (*O). This modification also significantly altered the adsorption properties on the catalyst surface, thereby regulating the residence time of key reaction intermediates and ultimately directing the N2O conversion pathway toward NO formation.