Co/Fe-Mg-O catalyst for ammonia decomposition

doi:10.16085/j.issn.1000-6613.2024-1945

Abstract

Abstract:

Ammonia is regarded as one of the best carrier for storing and transporting hydrogen. Currently iron based catalysts are receiving more and more attention due to the wide availability of raw materials, lower cost and better stability. Therefore, it is necessary to develop new materials and new catalyst preparation methods to help iron-based catalysts to achieve efficient ammonia decomposition. In this paper, composite metal oxides with Mg∶Fe=1∶2 were prepared by sol-gel method, and the XRD results showed that the prepared composite metal oxides conformed to the MgFe₂O₄ spinel structure, which avoided the clustering of Fe₂O₃, improved the sintering-resistant potential of Fe, and facilitated the dispersion of the iron active sites. Ammonia decomposition activity testing results demonstrated that the MFO catalyst had excellent high temperature ammonia decomposition activity, with a conversion rate of 85% at 600℃. It also possessed high-temperature stability, with no decrease in activity after 24h. In order to further improve its low-temperature ammonia decomposition activity, a certain proportion of cobalt and nickel were loaded by the impregnation method. The characterization results of XRD, TPR and TPD proved that the improved low-temperature activity of MFO catalyst was due to the synergistic effect of the Co(Ni)-Fe bi-component. Among them, the prepared 10Co-MFO catalyst showed 92% ammonia conversion and a hydrogen production of 545mmol/(g·h) at 600℃ under the condition of 9000mL/(g·h), and the conversion remained stable during 24h of continuous reaction.

Key words: ammonia decomposition, hydrogen production, reactivity, catalyst, two-component synergism

摘要：

氨气是公认的储存和运输氢气的最佳载体之一。目前铁基催化剂由于原料来源广泛，成本更低，稳定性更好，受到越来越多的关注。因此，有必要开发新材料和新的催化剂制备方法，帮助铁基催化剂实现高效的氨分解。本文首先采用溶胶凝胶法制备了Mg∶Fe=1∶2的复合金属氧化物（MFO），XRD结果显示其符合MgFe₂O₄尖晶石结构，该结构可避免Fe₂O₃的团簇，提高了Fe的抗烧结潜力，促进了铁物种活性位点的分散。氨分解活性测试结果证明MFO催化剂具有优异的高温氨分解活性，在600℃时，转化率达到85%。同时具备高温稳定性，经过24h后活性没有下降。为了进一步提高其低温氨分解活性，采用浸渍法负载了一定比例的钴和镍。XRD、TPR、TPD等表征结果证明由于Co(Ni)-Fe双组分的协同作用，可以有效提高MFO催化剂的低温活性。其中，所制备的10Co-MFO催化剂，具有最好的催化活性，在9000mL/(g·h)、600℃下，氨转化率为92%，产氢量为545mmol/(g·h)，在连续反应24h内转化率保持稳定。

关键词: 氨分解, 制氢, 活性, 催化剂, 双组分协同

CLC Number:

O643.36

LUAN Na, LI Zhuo, CHEN Song, LI Xuebing, WANG Zhong. Co/Fe-Mg-O catalyst for ammonia decomposition[J]. Chemical Industry and Engineering Progress, 2025, 44(12): 6944-6952.

栾娜, 李琢, 陈松, 李学兵, 王忠. Co/Fe-Mg-O催化剂促进氨分解[J]. 化工进展, 2025, 44(12): 6944-6952.

Figures/Tables 7

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