Silver nanoparticles modified mesoporous titanosilicate materials for high oxidation of carbon monoxide

This paper investigates a new path to synthesis an ordered nanostructured mesoporous titanosilicate by the assembly of preformed titanosilicate (MTS-9) precursors with triblock copolymers. Silver nanoparticles (AgNPs) with different loadings are supported on MTS-9 composite by two different methods: Deposition Precipitation with Urea (DPU) and Impregnation Reduction with Citrate (IRC). The structure and active component of catalysts were confirmed trough N-2 adsorption-desorption, X-ray diffraction (XRD), scanning electron microscopy (SEM), and high-resolution transmission electron microscopy (HRTEM). The influence of catalytic activity of AgNPs supported on MTS-9 has been evaluated in the oxidation of Carbon monoxide (CO). The obtained results emphasize on the improvement of catalytic activity of MTS-9 by AgNPs. A total of CO-oxidation up to 100% was achieved at 240 degrees C for the catalyst prepared by impregnation reduction with citrate. Indeed, the 0.5% Ag/MTS-9 (IRC) catalyst exhibited a high stability after four continuous runs. Overall, this catalyst could be very suitable for oxidation of carbon monoxide industrial process.

Automated summary

This study successfully synthesized an ordered nanostructured mesoporous titanosilicate through a new synthesis path and supported silver nanoparticles on it. Experimental results confirmed that the support of silver nanoparticles can significantly enhance the catalytic activity of mesoporous titanosilicate, especially in the oxidation of carbon monoxide.