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

• 作 者: 寻燕然 何欣欣 严涵 高自旺 金钊 贾春江
• 机 构: Key Laboratory for Colloid and Interface Chemistry,Key Laboratory of Special Aggregated Materials,Sc
• 出 处: Journal of Rare Earths
• 发表日期: 2017年01期
• 关键词: ammonia Fe lanthanum metallic calcination crystalline desorption amorphous calci

In this paper, a series of Fe- and Co-doped lanthanum(hydr)oxides catalysts were prepared by a simple coprecipitationhydrothermal method. The as-prepared catalysts were characterized with various techniques including powder X-ray diffraction(XRD), N_2 adsorption/desorption, inductively coupled plasma(ICP) and transmission electron microscopy(TEM). The Fe-based catalysts exhibited consecutive phase changes of amorphous Fe Ox→FeLaO_3→Fe_2N under different stages(as-prepared→calcination→ammonia decomposition reaction); as for Co-based catalysts, the phase transformation followed a sequence of Co(OH)_2→Co_3O_4→metallic Co. It was revealed that Fe_2N and metallic Co were most probably the active crystalline phase respectively for Feand Co-based catalysts in the decomposition of ammonia.

In this paper, a series of Fe- and Co-doped lanthanum (hydr) oxides catalysts were prepared by a simple coprecipitationhydrothermal method. The as-prepared catalysts were characterized with various techniques including powder X-ray diffraction (XRD) desorption, inductively coupled plasma (ICP) and transmission electron microscopy (TEM). The Fe-based catalysts exhibiting consecutive phase changes of amorphous Fe Ox → FeLaO 3 → Fe 2 N under different stages (as-prepared → calcination → ammonia decomposition reaction); as for Co-based catalysts, the phase transformation followed a sequence of Co (OH) _2 → Co_3O_4 → metallic Co. It was revealed that Fe_2N and metallic Co were most probably the active crystalline phase respectively for Fe and Co-based catalysts in the decomposition of ammonia .