催化作用
烧结
分解
氨
制氢
氢
化学
氧化物
化学计量学
化学工程
无机化学
层状双氢氧化物
氨生产
材料科学
有机化学
工程类
作者
Qin Su,Hehui Wang,Lingli Gu,Weijie Ji,Chak‐Tong Au
标识
DOI:10.1016/j.ijhydene.2021.07.020
摘要
The current study provided the first example to develop the Fe-based catalyst for COx-free hydrogen production via ammonia decomposition through the unique MgFe-layered double hydroxides (MgFe-LDHs) of different stoichiometric Mg/Fe ratio. The so obtained Fe-based catalyst is low-cost, readily obtainable, and environmentally friendly. Structurally, the Fe(FeNx) species are 3D-isolated by the nano-MgO entities, improving anti-sintering potential of Fe(FeNx); and electronically, the Fe (FeNx) species are promoted by the nano-MgO matrix, showing the strongest promoting effect of MgO on Fe(FeNx). At a GHSVNH3 of 150,000 mL gcat−1 h−1, the current N–Mg5.3FeOm catalyst can give an outstanding H2 formation rate of 9.83 mol gcat−1 h−1 at 680 °C and a TOFH2 = 2.19 s−1 at 530 °C. The influence of Mg/Fe constitution on catalyst structure, surface property, and performance was systematically investigated. The in-situ ammonia treatment was superior to the usually adopted hydrogen pre-reduction for the Fe–Mg oxide precursor, leading to easy development of small sized FeNx specimen and activity enhancement.
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