文献类型：期刊文献

中文题名：基于对硝基苯酚催化还原的SBA-15负载型高分散钯纳米颗粒的制备

英文题名：Synthesis of highly dispersed Pd nanoparticles within SBA-15 for the catalytic reduction of p-nitrophenol

作者：黄颖[1];顾金楼[1]

机构：[1]华东理工大学材料科学与工程学院,上海200237

年份：2013

卷号：8

期号：6

起止页码：545

中文期刊名：中国科技论文

外文期刊名：China Sciencepaper

收录：北大核心:【北大核心2011】；

基金：高等学校博士学科点专项科研基金资助项目(20090074120009)

语种：中文

中文关键词：SBA-15;钯;纳米粒子;催化剂;对硝基苯酚

外文关键词：SBA-15; palladium; nanoparticles; catalyst; p-nitrophenol

摘要：利用修饰于介孔SBA-15表面的硫酸官能团,静电吸附引入钯前驱体。低温下采用乙醇原位还原,直接在SBA-15孔道内获得钯纳米粒子,避免了钯颗粒的团聚。运用小角X射线衍射(XRD)、氮吸附(BET)与透射电镜(TEM)等方法测试催化剂的孔结构参数,并利用紫外可见光谱(UV-Vis)对对硝基苯酚还原反应的性能进行了研究。结果表明,催化剂结构高度有序,为六方相P6mm型,具有高比表面积(687m2/g),大孔容(1.1cm3/g)和窄的孔径分布(6.8nm)。在透射电镜下清晰可见钯物种高度分散于载体上。同时,紫外可见光谱分析仪跟踪检测证明了该催化剂对硼氢化钠还原对硝基苯酚具有较好的催化活性。
Pd precursors were introduced via electrostatic attraction with the sulfonic groups modified on the surface of SBA-15. Palladium nanoparticles have been successfully deposited in situ by a low-temperature ethanol reduction, which effectively avoided the aggregation of Pd species due to the mild reaction temperature. The small angle XRD, BET and transmission electron micros- copy （TEM） were employed to analyze the mesoporous structure of the synthesized catalysts, and its catalytic properties for p-ni- trophenol reduction by excessive sodium borohydride were monitored by UV-Vis spectra. The results showed that the structure of the catalyst was a hexagonal regular array of P6 mm symmetry with uniform mesopores ca. 6.8 nm in diameter, relatively high surface area of 687 m^2/g and pore volume as large as 1.1 cm^3/g. Furthermore, the results demonstrated that Pd species has been successfully obtained, and their high dispersion status can be clearly identified by TEM. UVvis spectra also revealed their highly efficient catalytic activity for p-nitrophenol reduction by excessive sodium borohydride.