Ti/Si-MCM-41 mesoporous materials, prepared by the commonly used hydrolysis-condensation method from the alkoxides, were found to be inhomogeneous. They possessed reduced porosity as the titania content was increased. Electron microscopy examination revealed that they contained two distinct phases: a well-structured hexagonal mesoporous silicate (no Ti) and a disordered titanosilicate phase in which Si and Ti were homogeneously distributed. It is notable that these heterogeneities are generally impervious to detection by the traditional N2--sorption and low-angle XRD analytical methods.A new synthetic approach was devised in which the reaction pH and phosphate ion concentration were carefully controlled. This led to the identification of conditions under which titanosilicates with both intra- and inter-particulate homogeneity could be prepared. The materials with homogeneously distributed Ti can then be used as anchor points for metal nanoparticles that are known for their CO2 conversion activity.

Homogeneous mesoporous titanosilicate catalyst supports for CO<sub>2</sub> conversion

243rd National Meeting (2012)

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Homogeneous mesoporous titanosilicate catalyst supports for CO2 conversion

Homogeneous mesoporous titanosilicate catalyst supports for CO₂ conversion