titanium silicate has a high insolubilty, thermal stability and is ideally suited for glass, optic and ceramic applications. It can be synthesized by sol-gel synthesis from titanium production waste, which is of added benefit to the environment.
The molecular structure of this zeolite family includes octahedral coordination of titanium framework atoms linked through classical tetrahedral silica rings. This is a unique feature of this material and explains its catalytic performance in the gas-phase epoxidation of propylene, where the nitrogen content can be used to improve the catalysts efficiency.
Synthesis of a novel nitrogen-containing titanium silicate to enhance the catalytic performance of Au/TS-1 in gas-phase epoxidation of propane and m-xylene. The resulting catalyst is a pore shape selective, xylene-specific catalyst with superior performance in promoting the formation of propylene oxide.
Low-temperature N2 adsorption-desorption isotherms and pore size distributions of titanium silicate (TS-1) xerogel have been studied. The pore size of this zeolite is larger than that of TiO2 and is primarily determined by the amount of TPABr present in the template liquid.
In addition to these physical adsorption mechanisms, this zeolite also exhibits significant ionic sorption capacity toward Ba2+ ions, where the maximal adsorption value is 144 mg/g and a D-R value of 0.947 kJ per mole of adsorbent was experimentally measured. This study suggests that the adsorption of Ba2+ is possible and may be useful for the development of new adsorbents with specific properties.
The ionic sorption of titanium oxides can be inhibited by the presence of acetylacetone in the reaction mixture. This prevents the precipitation of titanium hydroxide or hydroxyoxide that would occur readily in the absence of this additive at ambient temperatures especially in basic reaction media with high pH values.