Mesoporous silica films embedded with Ag nanoparticles were directly synthesized by a sol- gel dip-coating process,combining alkyl(ethylene oxide)surfactant as temple and tetraethoxysilane as inorganic precursor.The addition of Ag^+ ion to the reaction sol was prior to the formation of films,followed by the heat treatment at 150℃led to the creation of Ag nanoparticies.The formation of Ag nanoparticles and the change of its surface plasma resonance absorption were characterized by Uv-vis.The small anglc XRD test indicated that the films had an ordered hexagonal mesoporous structure,of which the unit cell paramcter was about 4.26 nm.The TEM images and EDS spectra of the samples have directly verified the presence of mono-dispersed Ag nanoparticles within the films,due to the confine effects of mesopores.
Heteropoly acid of Keggin structure phosphotungstic(HPW)and phosphomolybdic(HPMo) were chemically anchored to the modified SBA-15 channel.The materials were used as catalyst for oxidative desulfurization of organic sulfur compounds including benzothiophene(BT),dibenzothiophene(DBT)and 4,6-dimethydibenzothiophene(4,6-DMDBT).The experimental results show that the catalysts are efficient and reusable,the catalytic activity is hardly reduced even in the 5th cycle of use.
