摘要
分别以CuCl2、CuAc2和Cu(NH3)+4为铜源,正硅酸乙酯为硅源,十二胺为模板剂,在室温下合成了Cu HMS系列介孔分子筛催化剂。XRD、FT IR、孔容测定和元素分析结果表明,铜原子嵌入到介孔HMS骨架中将使HMS的晶胞发生扩张,孔容增大;使用Cu(NH3)+4合成的Cu HMS 3样品其结晶有序度好、骨架铜含量高。在催化苯酚羟基化反应中,Cu HMS 3催化剂显示出最佳的催化性能。在优化的反应条件下,可获得35%的苯酚转化率和90%以上的二酚选择性。
Copper substituted hexagonal mesoporous silica(Cu-HMS) was synthesized using tetraethyl silicate(TEOS) as silicon source, CuCl_2, CuAc_2 or Cu(NH_3)^+_4 as copper source and dodecylamine(DDA) as templating agent. XRD, FT-IR, AAS and pore volume measurements indicate that incorporation of copper resulted in expansion of unit cells and increase in pore volume of HMS; Cu-HMS-3 synthesized using Cu(NH3)^+_4 as copper source exhibited the best crystallinity and high Raney copper content. Cu-HMS-3 showed optimum catalytic properties for hydroxylation of phenol with in 30% H_2O_2 aqueous solution, with phenol conversion of 35% and selectivity to catechol and hydroquinone of 90% under the optimum reaction condition.
出处
《工业催化》
CAS
2004年第11期45-49,共5页
Industrial Catalysis
