Sonochemical synthesis of mesoporous iron oxide and accounts of its magnetic and catalytic properties
Sonochemical synthesis of mesoporous iron oxide and accounts of its magnetic and catalytic properties
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DOI：
10.1021/jp015532w
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发表时间：
2002-02-28
影响因子：
3.3
通讯作者：
Felner, I
中科院分区：
文献类型：
--
作者：
Srivastava, DN;Perkas, N;Felner, I
已经报道了使用声化学技术合成介孔氧化铁。乙醇铁(III)用作无机前体，CTAB用作有机结构导向剂。超声处理后，通过煅烧和溶剂萃取方法除去表面活性剂。 FTIR 光谱表明表面活性剂从介孔氧化铁的孔中去除。通过 XRD、TEM、TGA 和 BET 表面积测量来表征煅烧材料。发现溶剂萃取后的表面积为 274 m(2)/g。研究了材料的磁性和催化性能。所制备的非晶态Fe2O3表现出顺磁行为，而在350℃下煅烧后则转变为具有良好磁性能的γ-Fe2O3。研究了介孔氧化铁在温和条件下对环己烷氧化反应的催化活性。介孔Fe2O3催化剂表现出环己烷向环己酮和环己醇的高转化率，并且具有高选择性。
Synthesis of mesoporous iron oxides has been reported using a sonochemical technique. Iron(III) ethoxide was used as an inorganic precursor and CTAB as an organic structure directing agent. After sonication the surfactant was removed by calcination and solvent extraction methods. FTIR spectra demonstrated the removal of the surfactant from the pores of the mesoporous iron oxide. The calcinated material was characterized by XRD, TEM, TGA, and BET surface area measurements. The surface area after solvent extraction is found to be 274 m(2)/g. The magnetic and catalytic properties of the materials have been studied. The as-prepared amorphous Fe2O3 has shown a paramagnetic behavior, while after calcination at 350 degreesC it changes to gamma-Fe2O3 with good magnetic properties. The catalytic activity of mesoporous iron oxide was studied in the reaction of cyclohexane oxidation under mild conditions. The mesoporous Fe2O3 catalyst has shown high conversion of cyclohexane into cyclohexanone and cyclohexanol, with a high selectivity.