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beijingliu

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[交流] 【求助】teos制备溶胶时的ph 已有5人参与

各位:
我想用溶胶凝胶法制备催化剂,酸性催化剂,活性组分为杂多酸,选用二氧化硅为载体,想用teos制备,想问一下大家:制备步骤,还有各种物质的加入量是多少?成胶的ph是多少?谢谢!
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reimi

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在醇溶液中水解teos
2楼2010-05-20 17:00:34
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beijingliu

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引用回帖:
Originally posted by reimi at 2010-05-20 17:00:34:
在醇溶液中水解teos

能说的详细些吗?
3楼2010-05-20 17:19:39
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Jslwen

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TEOS做溶胶凝胶的文献不少啊
4楼2010-05-20 18:42:08
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americanyk

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liconglin970410(金币+2):多谢指点,欢迎常来催化版 2010-05-22 20:15:54
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.
5楼2010-05-20 19:12:50
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gamewang

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引用回帖:
Originally posted by americanyk at 2010-05-20 19:12:50:
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 ...

good I accepted!
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6楼2010-07-31 20:13:03
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