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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)。
Using the surfactant polyethylene oxide-polypropylene oxide-polyethylene oxide triblock copolymer (P123) and cetyltrimethylammonium bromide (CTAB) as co-templating agents and controlling their Compared with the hexagonal mesoporous SiO2 with different pore sizes and wall thicknesses, the material was characterized by XRD and N2 adsorption. The results showed that with the increase of the ratio of CTAB to P123, the pore size of mesoporous materials decreased and the wall thickness increased, but the mesostructure regularity decreased. Preliminary studies have shown that compared with heteroatoms such as vanadium and iron modified SBA-15 synthesized with a single P123 as a template, the synthesis of styrene-hydrogen peroxide in the selective oxidation of the catalytic properties have greatly improved. While the selectivity to benzaldehyde remained about 95%, the conversion of styrene increased from 20.1% (Fe-SBA-15) and 25.1% (V-SBA-15) to 36.8% (FS) and 44.6% .