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875418128(½ð±Ò+3): 2011-04-28 21:23:42
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ÍøÉÏÀý×Ó¾Ù²»Ê¤¾Ù£¬ÏÖ¸ø³öÁ½Àý£¬ÍûÂ¥Ö÷ÓÐËùÆô·¢²¢Äܹ»×Ô²éÎÄÏ×£º ¡¾ÎÄÏ×Ò»¡¿ £¨1£©To obtain the supported TiO2/SiO2 materials, a solution with the required amount of titanium tetraisopropoxide (TTIP) in isopropanol (TTIP:i-PrOH weight ratio = 1:8) to get 20, 40 and 60 TiO2 wt% loading was added to each silica support. £¨2£©After stirring the mixture for 45 minutes at room temperature, water was added until a molar ratio 160 H2O:TTIP was reached. The stirring was then continued for other 45 minutes. £¨3£©The mixture was centrifuged and the recovered solid was dried at 110 ºC overnight and calcined at 550 ºC for crystallisation. ¡¾ÎÄÏ×¶þ¡¿ (1) Silica is suspended in deionized water, to which an appropriate amount of TiC13 (Merck, 15% HCl solution) is added while the suspension is vigorously stirred ensuring a good homogeneity during the precipitation. (2)Then, the suspension is neutralized up to pH ca. 7 by slow addition of ammonium solution. (3)The precipitate is filtered and washed with deionized water several times. (4)Then, it is dried at 373 K for 12 h and calcined at 773 K in air for 12 h. This procedure allows the deposition of hydrated Ti(III) oxide which yields dispersed TiO2 species on the silica surface after thermal treatment. |
2Â¥2011-04-28 18:52:42
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ÈÙÓþ°æÖ÷ (ÎÄѧ̩¶·)
- C-EPI: 9
- Ó¦Öú: 12 (СѧÉú)
- ¹ó±ö: 6.089
- ½ð±Ò: 287974
- É¢½ð: 2492
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- Ìû×Ó: 55553
- ÔÚÏß: 3074.8Сʱ
- ³æºÅ: 175775
- ×¢²á: 2006-02-04
- ÐÔ±ð: GG
- רҵ: ÃÀѧ
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3Â¥2011-04-28 18:53:37
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½ð³æ (ÕýʽдÊÖ)
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- Ìû×Ó: 640
- ÔÚÏß: 289.3Сʱ
- ³æºÅ: 965912
- ×¢²á: 2010-03-09
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4Â¥2011-04-28 23:26:04
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½ð³æ (ÕýʽдÊÖ)
- Ó¦Öú: 0 (Ó×¶ùÔ°)
- ½ð±Ò: 504.1
- É¢½ð: 53
- ºì»¨: 3
- Ìû×Ó: 528
- ÔÚÏß: 419.5Сʱ
- ³æºÅ: 129705
- ×¢²á: 2005-12-10
- רҵ: ¸ß·Ö×ÓÎïÀíÓë¸ß·Ö×ÓÎïÀí»¯
5Â¥2011-05-16 09:21:02
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- ³æºÅ: 591274
- ×¢²á: 2008-09-02
- ÐÔ±ð: GG
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6Â¥2011-05-16 11:00:55
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7Â¥2012-10-18 10:02:18
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