Iron-based composite nanostructure catalysts used to produce CO x -free hydrogen from ammonia

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• 作者：Hui-Zhen Cui ; Ying-Qiu Gu ; Xin-Xin He ; Shuai Wei ; Zhao Jin…
• 关键词：Composite nanostructures ; Ammonia decomposition ; In situ XRD ; TPR
• 刊名：Chinese Science Bulletin
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：61
• 期：3
• 页码：220-226
• 全文大小：1,058 KB
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• 作者单位：Hui-Zhen Cui (1)
  Ying-Qiu Gu (1)
  Xin-Xin He (1)
  Shuai Wei (1)
  Zhao Jin (1)
  Chun-Jiang Jia (1)
  Qi-Sheng Song (1)
  
  1. Key Laboratory for Colloid and Interface Chemistry, School of Chemistry and Chemical Engineering, Shandong University, Jinan, 250100, China
  
• 刊物主题：Science, general; Life Sciences, general; Physics, general; Chemistry/Food Science, general; Earth Sciences, general; Engineering, general;
• 出版者：Springer Berlin Heidelberg
• ISSN：1861-9541

文摘

Iron-based composite nanostructures with ceria or titania as shell coating on naked iron spheres were successfully synthesized and used to catalyze ammonia decomposition. The structure and texture of fresh and used catalysts were characterized by transmission electron microscopy, X-ray diffraction, in situ X-ray diffraction, temperature-programmed reduction by hydrogen, and N₂ adsorption–desorption. For ammonia decomposition, the iron-based composite catalyst coated with cerium and titanium showed excellent catalytic activity compared with naked iron sphere catalyst, with the former yielding nearly 100 % ammonia conversions at 650 °C and showing high stability in the catalysis test (for 60 h) at 600 °C with a space velocity of 24,000 cm3 g _cat −1  h −1. These results showed that adding cerium and titanium played a key role in improving catalytic activity for ammonia decomposition and enabling high thermal stability.