催化作用
离解(化学)
密度泛函理论
沸石
化学
缩放比例
铁白云石
氢
计算化学
化学物理
化学工程
纳米技术
物理化学
材料科学
有机化学
几何学
数学
工程类
作者
Chunli Liu,Gaomou Xu,Tao Wang
出处
期刊:JACS Au
[American Chemical Society]
日期:2023-11-07
卷期号:3 (12): 3374-3380
被引量:1
标识
DOI:10.1021/jacsau.3c00546
摘要
The Haber–Bosch (H–B) process is today’s dominant technology for ammonia production, but achieving a mild reaction condition is still challenging. Herein, we combined density functional theory (DFT) calculations and microkinetic modeling (MKM) to demonstrate the feasibility of conducting the H–B process under ambient conditions on a zeolite catalyst with confined dual active sites. Our designed dual Mo(II) cation-anchored ferrierite [2Mo(II)-FER] catalyst shows an energy barrier of only 0.58 eV for N≡N bond breaking due to the enhanced π-back-donation. Meanwhile, the three hydrogen sources (BH, FMH, and NMH) within 2Mo(II)-FER greatly enrich the hydrogenation mechanisms of NHx species, resulting in barriers of <1.1 eV for NHx (x = 0–2) hydrogenations. This dual-site catalyst properly decouples the N2 dissociation and NHx hydrogenation steps, which elegantly circumvents the linear scaling relation between the N2 dissociation barrier and the nitrogen binding energy. It is worth noting that our MKM results show 4 orders of magnitude higher reaction rates on 2Mo(II)-FER than the stepped sites of the FCC Ru catalyst at low temperatures, paving a solid basis to conduct the H–B process at low temperatures. We believe that our strategy will provide crucial guidance for synthesizing state-of-the-art zeolite catalysts to achieve the near-ambient condition H–B process and other chemical reactions in heterogeneous catalysis.
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