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Fe/ZSM-5 catalysts for ammonia decomposition to COx-free hydrogen: Effect of SiO2/Al2O3 ratio
Molecular Catalysis ( IF 3.9 ) Pub Date : 2018-05-29 , DOI: 10.1016/j.mcat.2018.05.027
Zhong-Pan Hu , Lei Chen , Chong Chen , Zhong-Yong Yuan

HZSM-5 zeolites with different SiO2/Al2O3 ratios are employed as supports of Fe catalysts for NH3 decomposition. The structural and surface properties of the prepared Fe/ZSM-5 catalysts are characterized by solid-state NMR, XRD, N2 sorption, TEM, H2-TPR, NH3-TPD and XPS techniques, giving an insight into the active sites responsible for NH3 decomposition reaction. It is revealed that the catalytic activities of Fe/ZSM-5 catalysts are correlated with the SiO2/Al2O3 ratios of ZSM-5 support. And the SiO2/Al2O3 ratio of ZSM-5 zeolites could significantly affect the acidity, NH3 adsorption-desorption processes, metal-support interactions, and Fe particles size and distributions of Fe/ZSM-5 catalysts, and thus, affecting their catalytic performance. The Fe/ZSM-5 catalysts with low SiO2/Al2O3 ratio exhibit high catalytic performance. Almost 99% NH3 decomposition could be achieved over the 5%Fe/ZSM-5 catalyst with SiO2/Al2O3 ratio of 28 at 650 °C at a high space velocity of 30,000 cm3 h−1 gcat−1, suggesting a very promising catalyst in NH3 decomposition.



中文翻译:

Fe / ZSM-5氨分解为无CO x的氢的催化剂:SiO 2 / Al 2 O 3的比率的影响

使用具有不同SiO 2 / Al 2 O 3比的HZSM-5沸石作为Fe催化剂用于NH 3分解的载体。通过固态NMR,XRD,N 2吸附,TEM,H 2 -TPR,NH 3 -TPD和XPS技术表征了制备的Fe / ZSM-5催化剂的结构和表面性质,从而深入了解了活性位点负责NH 3分解反应。结果表明,Fe / ZSM-5催化剂的催化活性与ZSM-5载体的SiO 2 / Al 2 O 3比有关。和SiO 2 / Al 2ZSM-5沸石的O 3比会显着影响酸度,NH 3吸附-解吸过程,金属-载体相互作用以及Fe / ZSM-5催化剂的Fe粒径和分布,从而影响其催化性能。具有低SiO 2 / Al 2 O 3比的Fe / ZSM-5催化剂表现出高催化性能。在5%的Fe / ZSM-5催化剂上,SiO 2 / Al 2 O 3比为28,在650°C下以30,000 cm 3  h -1  g cat -1的高空速可以实现将近99%的NH 3分解。,表明在NH 3分解中非常有希望的催化剂。

更新日期:2018-05-29
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