Fe- and Co-doped lanthanum oxides catalysts for ammonia decomposition: Structure and catalytic performances

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• 作者：Yanran XUN (寻燕然) ; Xinxin HE (何欣欣) ; Han YAN (严 涵) ; Ziwang GAO (高自旺) ; Zhao JIN (金 钊) ; Chunjiang JIA (贾春江) ; ^{jiacj@sdu.edu.cn}
• 关键词：transitional metal ; rare earth ; lanthanum (hydr)oxides ; composite catalysts ; ammonia decomposition
• 刊名：Journal of Rare Earths
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：35
• 期：1
• 页码：15-23
• 全文大小：4389 K
• 卷排序：35

文摘

In this paper, a series of Fe- and Co-doped lanthanum (hydr)oxides catalysts were prepared by a simple coprecipitation-hydrothermal method. The as-prepared catalysts were characterized with various techniques including powder X-ray diffraction (XRD), N2 adsorption/desorption, inductively coupled plasma (ICP) and transmission electron microscopy (TEM). The Fe-based catalysts exhibited consecutive phase changes of amorphous FeOx→FeLaO3→Fe2N under different stages (as-prepared→calcination→ammonia decomposition reaction); as for Co-based catalysts, the phase transformation followed a sequence of Co(OH)2→ Co3O4→metallic Co. It was revealed that Fe2N and metallic Co were most probably the active crystalline phase respectively for Fe- and Co-based catalysts in the decomposition of ammonia.