一步水热法合成铜改性的介孔γ-Al_2O_3及其吸附脱硫性能研究

Adsorption desulfurization performance by Cu-modified mesoporous γ-Al_2O_3 from one-step hydrothermal synthesis

采一步水热合成法,以Al（NO3）3 为铝源,P123为模板剂,NaOH、Na2CO3 和K2CO3 分别为沉淀剂,Cu（NO3）2为铜源,制备出负载铜的金属有序介孔γ-Al2O3,并运用N2 吸附-脱附和XRD等技术对其结构进行表征,同时探讨了铜改性的介孔γ-Al2O3对模型燃油中的噻吩的吸附性能.结果表明,这3种沉淀剂都能制备出比表面积大（〉226m^2/g）,孔径分布中心为3.3nm,孔体积为0.27～0.35cm3/g的负载铜的介孔γ-Al2O3,且样品都保持了较好的介孔结构.样品对模型燃油中噻吩的吸附脱硫性能表明,用NaOH作为沉淀剂且负载铜的介孔γ-Al2O3样品对噻吩的吸附性能较好,原因在于此样品具有较大的比表面积且铜在此样品中的分散性较好.

The materials of copper supported on organized mesoporous γ-Al2O3 have been prepared by one-step hydrothermal synthesis method,using aluminum nitrate as the source of alumina,P123 as template,cupric nitrate as the source of copper,and Na OH,Na2CO3 and K2CO3as precipitating agents,respectively. The structural properties of the samples were investigated by XRD and N2 adsorption. The removal of thiophene from model fuel by these adsorbents was investigated. The results show that adsorbents based on Cu supported on mesoporous γ-Al2O3 have a well-defined mesoporous structure with high surface areas( > 226 m2/ g),narrow pore size distributions( about 3. 3 nm),and larger pore volumes( 0. 27 ~0. 35 cm3/ g). The sample prepared in the presence of Na OH exhibits a better sulfur adsorption capacity than its analogues. This is due to the large specific surface area and high dispersion state of Cu on the sample.