A new method named peptizinggelation method was used to synthesize TiSi dioxide composite, whose surface area is above 1 000 m2/g. The character of this method is that Ti exists in the form of ion and ion cluster duri...A new method named peptizinggelation method was used to synthesize TiSi dioxide composite, whose surface area is above 1 000 m2/g. The character of this method is that Ti exists in the form of ion and ion cluster during the hydrolysis of Si(OC 2H 5) 4 . This is the progress on the cohydrolysis of Si(OC 2H 5) 4 and Ti(OC 4H 9) 4. During the calcination of gelation, Ti—O—Si was formed with Ti element in the situation of SiO 2 crystal cell. This is confirmed by FTIR analysis. TiSi dioxide composite with Ti molar fraction of 13.1% is mainly in the form of amorphous based on XRD analysis, which reveals that TiSi dioxide composite is uniform in structure. Furthermore, extra Ti element presents on the surface layer of TiSi dioxide composite examined by Raman and EES analysis. Owning to these two characters, TiSi dioxide composite prepared by peptizinggelation method becomes a good catalyst in the field of catalysis.展开更多
A convenient and economic method for preparing highly ordered MCM 41 was studied in an open vessel by using waterglass as the silicon source. XRD, nitrogen adsorption and TEM show that the product has a highly ordered...A convenient and economic method for preparing highly ordered MCM 41 was studied in an open vessel by using waterglass as the silicon source. XRD, nitrogen adsorption and TEM show that the product has a highly ordered structure and the hexagonal arrangements of uniformly size pores distribution.展开更多
A new method for mimic biomineralization was used to synthesize CaCO 3 . The organized organic substrates, which could associate with Ca 2+ by means of molecular recognition and induce the nucleation and growth of CaC...A new method for mimic biomineralization was used to synthesize CaCO 3 . The organized organic substrates, which could associate with Ca 2+ by means of molecular recognition and induce the nucleation and growth of CaCO 3, were synthesized fristly, and followed by the preparation of the CaCO 3 by carbonation of a solution of Ca(OH) 2 with CO 2. Well dispersed spindle-like nano-CaCO 3 particles with an average width of 50 nm and a ratio of diameter to length about 1∶5 were obtained under the given experimental conditions. The products were characterized by FTIR spectra, TGA analysis and transmission electron microscope(TEM).展开更多
文摘A new method named peptizinggelation method was used to synthesize TiSi dioxide composite, whose surface area is above 1 000 m2/g. The character of this method is that Ti exists in the form of ion and ion cluster during the hydrolysis of Si(OC 2H 5) 4 . This is the progress on the cohydrolysis of Si(OC 2H 5) 4 and Ti(OC 4H 9) 4. During the calcination of gelation, Ti—O—Si was formed with Ti element in the situation of SiO 2 crystal cell. This is confirmed by FTIR analysis. TiSi dioxide composite with Ti molar fraction of 13.1% is mainly in the form of amorphous based on XRD analysis, which reveals that TiSi dioxide composite is uniform in structure. Furthermore, extra Ti element presents on the surface layer of TiSi dioxide composite examined by Raman and EES analysis. Owning to these two characters, TiSi dioxide composite prepared by peptizinggelation method becomes a good catalyst in the field of catalysis.
文摘A convenient and economic method for preparing highly ordered MCM 41 was studied in an open vessel by using waterglass as the silicon source. XRD, nitrogen adsorption and TEM show that the product has a highly ordered structure and the hexagonal arrangements of uniformly size pores distribution.
文摘A new method for mimic biomineralization was used to synthesize CaCO 3 . The organized organic substrates, which could associate with Ca 2+ by means of molecular recognition and induce the nucleation and growth of CaCO 3, were synthesized fristly, and followed by the preparation of the CaCO 3 by carbonation of a solution of Ca(OH) 2 with CO 2. Well dispersed spindle-like nano-CaCO 3 particles with an average width of 50 nm and a ratio of diameter to length about 1∶5 were obtained under the given experimental conditions. The products were characterized by FTIR spectra, TGA analysis and transmission electron microscope(TEM).
