Investigation of Fe-P-B ultrafine amorphous nanomaterials : Influence of synthesis parameters on physicochemical and catalytic properties
Investigation of Fe-P-B ultrafine amorphous nanomaterials : Influence of synthesis parameters on physicochemical and catalytic properties
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DOI：
10.1016/j.molcata.2008.04.013
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发表时间：
2008-06
影响因子：
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通讯作者：
B. Rajesh;N. Sasirekha;Shao-Pai Lee;H. Kuo;Yu‐Wen Chen
中科院分区：
文献类型：
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作者：
B. Rajesh;N. Sasirekha;Shao-Pai Lee;H. Kuo;Yu‐Wen Chen
采用化学还原法合成了一系列Fe-P-B非晶合金超细颗粒，研究了FeCl 2·4 H2O、FeCl 3·6 H2O、Fe（OAc）2等铁源和反应介质（H2O、50%乙醇和50%异丙醇）对非晶合金超细颗粒的影响。采用X射线衍射、电感耦合等离子体原子发射光谱、N2吸附、透射电子显微镜、X射线光电子能谱和电子衍射等手段对合成材料的物理化学性质进行了表征。Fe-P-B材料的非晶态性质的存在被发现甚至在温度高达300°C时仍被保留。在制备过程中使用不同的铁前驱体和溶剂显著影响Fe-P-B纳米合金的结构、形貌和组成。以乙醇脱氢为反应体系，考察了Fe-P-B纳米合金的催化性能，并将其结果与Fe-P-B纳米合金的表面性质进行了关联。以FeCl_2为原料，在50%乙醇溶液中制备的Fe-P-B催化剂的活性最高。
A series of Fe–P–B ultrafine amorphous alloy particles were synthesized by chemical reduction method to study the influence of iron precursors such as FeCl2·4H2O, FeCl3·6H2O, and Fe(OAc)2and reaction medium (H2O, 50% ethanolic solution, and 50% isopropyl alcoholic solution). The physicochemical properties of the as-synthesized materials were characterized by X-ray diffraction, inductively coupled plasma-atomic emission spectroscopy, N2sorption, transmission electron microscopy, X-ray photoelectron spectroscopy, and electron diffraction. The existence of amorphous nature of Fe–P–B materials was found to be retained even when the temperature was up to 300°C. Use of different iron precursors and solvents in the preparation significantly influenced the structure, morphology, and composition of Fe–P–B nanoalloys. Dehydrogenation of ethanol has been carried out in order to evaluate the catalytic properties of the Fe–P–B nanoalloys and the results have been related to the surface properties of Fe–P–B nanoalloys. Fe–P–B prepared with FeCl2in 50% ethanolic solution, showed the highest activity among all the Fe–P–B catalysts.