CuO/凹凸棒土负载型催化剂的合成及其催化2,3-丁二醇的脱氢反应

摘要

采用湿法浸渍制备了一系列CuO/凹凸棒土负载型催化剂,并用于2,3-丁二醇的脱氢反应,采用XRD、N2吸附-脱附、TEM、H2-TPR和XPS等表征了催化剂的结构.实验结果表明,与凹凸棒土相比,CuO/凹凸棒土催化剂可提高3-羟基丁酮的选择性,抑制2,3-丁二醇脱水产生丁酮;CuO负载量为10％(w)的凹凸棒土催化剂的活性最高,反应温度为240 ℃时,2,3-丁二醇的转化率和3-羟基丁酮的选择性分别为95.2％,66.8％;较高的反应温度有助于2,3-丁二醇的转化,但是低温更利于3-羟基丁酮的生成;CuO负载量为10％(w)的凹凸棒土催化剂的优越性能归属于其独特的氧化还原性能,源于催化剂表面分散均匀的纳米CuO颗粒及其与凹凸棒土之间的强相互作用.%A series of CuO/palygorskite(CuO/Pal) have been prepared and used as the catalysts for 2,3-butaniediol dehydrogenation.The structure characteristics of catalysts have been disclosed by a series of physico-chemical methods,such as XRD,N2 adsorption-desorption,TEM,H2-TPR and XPS.Compared with parent palygorskites,CuO/Pal could improve the selectivity to 3-hydroxy-2-butanone,and inhibit the 2,3-butanediol dehydration to methyl ethyl ketone.Among the catalysts,CuO loading was 10％(w) showed the best performance with 95.2％ 2,3-butanediol conversion and 66.8％ 3-hydroxy-2-butanone selectivity at 240 ℃.Meanwhile,the higher temperature could improve the conversion of 2,3-butanediol,and the lower temperature could be beneficial to 3-hydroxy-2-butanone formation.Based on these results,the excellent performance over CuO loading was 10％(w) could be ascribed to the unique redox properties,which was originated from highly dispersed CuO nanoparticles and its strong interaction with palygorskite.