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875418128

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[求助] 二氧化钛如何负载在二氧化硅上

二氧化钛如何负载在二氧化硅上，最好有具体文献或操作步骤，谢谢给位虫友啦！

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1楼 2011-04-28 18:04:34

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【答案】应助回帖

875418128(金币+3): 2011-04-28 21:23:42

网上例子举不胜举，现给出两例，望楼主有所启发并能够自查文献：

【文献一】
（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.

【文献二】
(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.