Ce改性介孔γ-Al_2O_3的一步水热合成及其对噻吩的吸附性能

Adsorption of thiophene on Ce supported on organized mesoporous γ-Al_2O_3 prepared by in-situ synthesis

采用一步水热合成法,以硝酸铝为铝源,P123为模板剂,NaOH、Na2CO3和K2CO3分别为沉淀剂,硝酸铈为铈源,制备出负载Ce的金属有序介孔γ-Al2O3,并采用低温N2吸附-脱附和XRD等方法对其结构进行表征,同时验证了Ce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(>214 m2/g),孔径分布窄的负载Ce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作为沉淀剂制备的样品对噻吩的吸附性能要优于用Na2CO3或K2CO3作为沉淀剂的样品;对于同一种沉淀剂制备的介孔γ-Al2O3样品,添加Ce后,样品对噻吩的吸附量均明显增加。

Ce supported on organized mesoporous γ-Al2O3 were prepared by in-situ synthesis method.Aluminum nitrate was used as the source of alumina,P123 as template,NaOH,Na2CO3 and K2CO3 as assistant solvent,respectively,Ce were provided by cerium nitrate.The physico-chemical and structural properties of the samples were investigated by XRD and nitrogen adsorption-desorption method.And desulfurization of model fuel with these samples was investigated at room temperature.The results showed that adsorbents based on Ce supported on mesoporous γ-Al2O3 had more stable structure,high surface area（214m2/g） and narrow pore size distribution.The sample prepared by NaOH as assistant solvent exhibited higher sulfur adsorption capacity than the sample prepared by Na2CO3 or K2CO3.For the sample prepared with the same assistant solvent,the sample with Ce showed the better desulfurization performance than the sample without.