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化工学报  2015 

磁性CuO-Bi2O3/Fe3O4-SiO2-MgO催化剂的制备及甲醛乙炔化性能

DOI: 10.11949/j.issn.0438-1157.20141934, PP. 2098-2104

Keywords: 分离,回收,催化,甲醛乙炔化,1,4-丁炔二醇,磁性

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Abstract:

采用浸渍法和共沉淀法制备了一系列不同Cu含量的超顺磁CuO-Bi2O3/Fe3O4-SiO2-MgO催化剂。使用电感耦合等离子体发射光谱仪(ICP-AES)、低温N2物理吸-脱附、X射线衍射(XRD)、H2程序升温还原(H2-TPR)、振动样品磁强计(VSM)对催化剂的组成、结构、织构及磁性能进行表征,评价了该催化剂催化甲醛乙炔化合成1,4-丁炔二醇的催化活性。结果表明,制备方法对催化剂中活性组分CuO的存在状态及炔化性能有较大影响,采用共沉淀法较浸渍法制备的催化剂具有更高的比表面积、CuO分散度与较好的还原能力,表现出较高的炔化性能;Cu含量是影响催化剂炔化性能的另一重要因素,随Cu含量的增加,催化剂活性逐渐增加,在本研究考察范围内,以共沉淀法制备的Cu质量分数为30%的催化剂表现出最佳的甲醛乙炔化性能。同时,该催化剂具有良好的超顺磁性,可以在外加磁场的作用下迅速分离回收,循环使用6次后,其催化活性明显高于非磁性催化剂。

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