2005•Acta Petrolei Sinica(Petroleum Processing Section)Requires access
Preparation and Characterization of nano-TiO_2/Al_2O_3 Combined Support
Min Wei
Open publisher page 0 citations
Abstract
The TiO_2/Al_2O_3 combined supports were prepared respectively by preprecipitated,coprecipitated,sol-gel and improved sol-gel method,and then characterized by XRD,TEM,FT-IR and BET.The results of BET showed that the TiO_2/Al_2O_3 combined supports prepared by coprecipitated and improved sol-gel method had large surface area,pore volume and marrow pore diameter distribution.XRD profiles illustrated that after calcinated at 550℃,TiO_2 was in the form of anatase and γ-Al_2O_3 in the form of crystal in the combined support,and the TiO_2 particles were uniformly dispersed on γ-Al_2O_3.The TEM photos showed that TiO_2 on the surface of γ-Al_2O_3 was nanometer grain;when prepared by coprecipitated method,the TiO_2 uniformly dispersed on γ-Al_2O_3 with monolayer or sub-monolayer form,but when prepared by improved sol-gel method,anatase TiO_2 and γ-Al_2O_3 particles were in the shape of olive and flocculence.The FT-IR spectra indicated that there were mainly L acid and only a dram of B acid in nano-TiO_2/Al_2O_3 samples.