Spin conversion of hydrogen using supported iron catalysts at cryogenic temperature
Spin conversion of hydrogen using supported iron catalysts at cryogenic temperature
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DOI：
10.1016/j.cryogenics.2015.03.003
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发表时间：
2015-07-01
期刊：
影响因子：
2.1
通讯作者：
Oh, In-Hwan
中科院分区：
文献类型：
--
作者：
Das, Taraknath;Kweon, Soon-Cheol;Oh, In-Hwan
氧化铝负载的氧化铁通过初湿浸渍法制备，并用于低温下正氢至仲氢的自旋转化。使用 SEM、XRD、拉曼和原位 FTIR 光谱等一系列表征技术对这些材料进行了表征。通过间歇操作模式在低温下研究了自旋转化。以透射模式收集原位 FTIR 光谱以获得自旋转换。虽然氧化铁在低负载百分比下高度分散在氧化铝载体上，但在高负载百分比下形成氧化铁的棒状微晶。氧化铝上 10 重量％和 20 重量％的氧化铁被证明是最活跃的催化剂。自旋转换过程非常缓慢并且依赖于时间。结论是，自旋转化率是多种因素的函数，包括氧化铁负载百分比、煅烧温度和不同的载体。 (C) 2015 Elsevier Ltd. 保留所有权利。
Alumina-supported iron oxides have been prepared by incipient wetness impregnation method and employed for orthohydrogen to parahydrogen spin conversion at cryogenic temperature. These materials were characterized using a series of characterization techniques such as SEM, XRD, Raman and in situ FTIR spectroscopy. The spin conversion was investigated at low temperature by a batch mode of operation. The in situ FTIR spectra were collected in a transmission mode to obtain the spin conversion. While the iron oxide was highly dispersed over alumina support at low loading percent, a rodlike crystallite of iron oxide was formed at high loading percent. The 10 and 20 wt% iron oxides on alumina were proved to be the most active catalysts. The spin conversion process was very slow and time-dependent. It was concluded that the spin conversion was a function of various factors including the iron oxide loading percent, calcination temperature, and different supports. (C) 2015 Elsevier Ltd. All rights reserved.