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首页> 外文期刊>Journal of Materials Chemistry, A. Materials for energy and sustainability >Transition metal nanoparticles dispersed in an alumina matrix as active and stable catalysts for COx-free hydrogen production from ammonia
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Transition metal nanoparticles dispersed in an alumina matrix as active and stable catalysts for COx-free hydrogen production from ammonia

机译：过渡金属纳米颗粒分散在氧化铝基质中，作为活性和稳定的催化剂，可从氨中生产无COx的氢气

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摘要

Transition metal (Fe, Co, and Ni) nanoparticles dispersed in an alumina matrix as catalysts for NH3 decomposition have been synthesized by a facile co-precipitation method. The fresh and used catalysts were characterized by various techniques including powder X-ray diffraction (XRD), N-2 adsorption/desorption, and transmission electron microscopy (TEM). Also, temperature-programmed reduction by hydrogen (H-2-TPR) combining in situ XRD was performed to investigate the reducibility of the studied catalysts. For the ammonia decomposition reaction, 88% conversion of ammonia can be realized at the reaction temperature as low as 600 degrees C using a space velocity of 72 000 cm(3) g(cat)(-1) h(-1) NH3 during a long term (72 h) catalysis test without any observable deactivation. The small amount of alumina (low to 10 at%) can act as the matrix in which the catalytically active transition metal nanoparticles were stabilized. Thus, the agglomeration of active transition metals under reaction conditions was significantly suppressed and the high activity of catalysts was maintained.
机译：通过简便的共沉淀法合成了分散在氧化铝基质中作为NH3分解催化剂的过渡金属（Fe，Co和Ni）纳米粒子。通过各种技术对新鲜和使用过的催化剂进行了表征，包括粉末X射线衍射（XRD），N-2吸附/解吸和透射电子显微镜（TEM）。此外，进行了程序控制的氢气还原反应（H-2-TPR）原位XRD，以研究所研究催化剂的还原性。对于氨分解反应，在低至600摄氏度的反应温度下，使用72 000 cm（3）g（cat）（-1）h（-1）NH3的空速可实现88％的氨转化率长期（72 h）催化测试，未观察到任何失活。少量的氧化铝（低至10 at％）可以用作稳定催化活性过渡金属纳米颗粒的基质。因此，显着抑制了反应条件下活性过渡金属的团聚，并保持了催化剂的高活性。

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