六方相介孔SiO2孔径及壁厚调节  

Adjustment on pore size and wall thickness of hexagonal mesoporous silica

作　　者：韩冰[1,2] 王海青[2] 时晓波[2] 孔岩[2] 

机构地区：[1]南京工程学院材料工程学院,南京211167 [2]南京工业大学化学化工学院,材料化学工程国家重点实验室,南京210009

出　　处：《化工新型材料》2013年第9期102-104,共3页New Chemical Materials

基　　金：国家自然科学基金(21276125,20876077);江苏省自然科学基金(BK2011372);江苏省高校重大项目自然科学基金(10KJA530015,11KJB430008)资助

摘　　要：以表面活性剂聚环氧乙烷-聚环氧丙烷-聚环氧乙烷三嵌段共聚物(P123)和十六烷基三甲基溴化铵(CTAB)为共模板剂并通过控制其物质的量比合成了具有不同孔径和壁厚的六方相介孔SiO2材料,以XRD,N2吸附方法进行了表征。结果显示,随CTAB与P123物质的量比的增加介孔材料孔径减小而壁厚呈增大趋势,但介孔规整度有所降低。初步研究表明,相比杂原子如钒、铁修饰以单一P123作为模板剂合成的SBA-15,所合成材料在苯乙烯过氧化氢选择氧化反应中催化性能有较大改进。苯甲醛选择性保持95%左右不变,而苯乙烯转化率分别由20.1%(Fe-SBA-15)和25.1%(V-SBA-15)提高到36.8%(F-S)和44.6%(V-S)。Hexagonal mesoporous silica with different pore size and wall thickness were synthesized by the block co polymer EO20POTOEO20（P123）and the cationic surfactant cetyltrimethylammonium bromide CTAB as co-template. The resulted materials were characterized by X-ray diffraction（ XRD） patterns and N2 physical sorption isotherms. Results indi cated that the pore size was decreased continuously with the increasing of the molar ratio of CTAB and P123 ,while the wall thickness changed slightly, and the orderliness of mesostructure become worse. While it was modified with Fe or V, the pre pared materials exhibited much better catalytic activity in the selective oxidation of styrene by using hydrogen peroxide as oxidant than those of SBA-15 synthesized using only P123 as template.

关 键 词：六方相 介孔 孔径调节 催化性能 

分 类 号：O614.411[理学—无机化学]