Spinel CuFe2O4:: a precursor for copper catalyst with high thermal stability and activity
Spinel CuFe2O4:: a precursor for copper catalyst with high thermal stability and activity
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DOI：
10.1007/s10562-004-3091-z
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发表时间：
2005-03-01
影响因子：
2.8
通讯作者：
Tsai, AP
中科院分区：
文献类型：
--
作者：
Kameoka, S;Tanabe, T;Tsai, AP
研究了尖晶石CuFe2O4作为铜催化剂的前驱体。在800℃空气中煅烧，以Fe/Cu=2的原子比在SiO2上有效地形成了尖晶石CuFe2O4。在600℃H-2还原后，Cu颗粒在CuFe2O4/SiO2 （Fe/Cu=2）上的烧结被明显抑制，而Cu颗粒在Cu/SiO2 （Fe/Cu=0）上的烧结则发生了致命的烧结。与Cu/SiO2催化剂相比，CuFe2O4/SiO2催化剂在甲醇蒸汽重整（SRM）中表现出更高的活性和热稳定性。二氧化硅上的尖晶石CuFe2O4经过800℃的空气煅烧处理后可以再生，活性也完全恢复。基于这些发现，我们提出尖晶石CuFe2O4是高性能铜催化剂的有效前驱体，其中Cu和Fe（或Fe氧化物）之间的不混相相互作用在Cu颗粒的稳定中起重要作用。
Spinel CuFe2O4 has been studied as a precursor for copper catalyst. The spinel CuFe2O4 was effectively formed on the SiO2 by calcination in air at 800 degrees C with the atomic ratio of Fe/Cu=2. The spinel CuFe2O4 on the SiO2 was reduced to fine dispersion of Cu and Fe3O4 particles by the H-2 reduction at 240 degrees C. After H-2 reduction at 600 degrees C, sintering of Cu particles over the CuFe2O4/SiO2 (Fe/Cu=2) was inhibited significantly, while fatal sintering of Cu particles over the Cu/SiO2 (Fe/Cu=0) occurred. The CuFe2O4/SiO2 catalyst exhibited much higher activity and thermal stability for steam reforming of methanol (SRM), compared with the Cu/SiO2 catalyst. The spinel CuFe2O4 on the SiO2 can be regenerated after an intentional sintering treatment by calcination in air at 800 degrees C where the activity is also restored completely. Based on these findings, we propose that spinel CuFe2O4 is an effective precursor for a high performance copper catalyst in which the immiscible interaction between Cu and Fe (or Fe oxide) plays an important role in the stabilization of Cu particles.