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beijingliu金蟲(chóng) (正式寫(xiě)手)
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[交流]
【求助】teos制備溶膠時(shí)的ph 已有5人參與
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各位: 我想用溶膠凝膠法制備催化劑,酸性催化劑,活性組分為雜多酸,選用二氧化硅為載體,想用teos制備,想問(wèn)一下大家:制備步驟,還有各種物質(zhì)的加入量是多少?成膠的ph是多少?謝謝! |
金蟲(chóng) (正式寫(xiě)手)
木蟲(chóng) (小有名氣)
榮譽(yù)版主 (文壇精英)
Excellent
| Use of amphiphilic triblock copolymers to direct the organization of polymerizing silica species has resulted in the preparation of well-ordered hexagonal mesoporous silica structures (SBA-15) with uniform pore sizes up to approximately 300 angstroms. The SBA-15 materials are synthesized in acidic media to produce highly ordered, two-dimensional hexagonal (space group p6mm) silica-block copolymer mesophases. Calcination at 500°C gives porous structures with unusually large interlattice d spacings of 74.5 to 320 angstroms between the (100) planes, pore sizes from 46 to 300 angstroms, pore volume fractions up to 0.85, and silica wall thicknesses of 31 to 64 angstroms. SBA-15 can be readily prepared over a wide range of uniform pore sizes and pore wall thicknesses at low temperature (35° to 80°C), using a variety of poly(alkylene oxide) triblock copolymers and by the addition of cosolvent organic molecules. The block copolymer species can be recovered for reuse by solvent extraction with ethanol or removed by heating at 140°C for 3 hours, in both cases, yielding a product that is thermally stable in boiling water. |
木蟲(chóng) (著名寫(xiě)手)

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