Relationship between catalytic performance and structure of supported catalyst

The supported catalysts which can effectively remove organic compounds discharged to atmosphere were prepared, using γ-Al₂O₃ or SiO₂ as carriers, V₂O₅ or TiO₂ as active components. The catalytic oxidation of methylbenzene was used as model reaction, and the activity of prepared catalysts was investigated. The experimental results indicated that V₂O₅-TiO₂/SiO₂ showed the best catalytic activity for the degradation of methyl-benzene, with low initial temperature. V₂O₅-TiO₂/SiO₂ gave similar activity and temperature characteristic compared with noble metal and possessed better resistance against impact. The optimum loading amount of V₂O₅ was 1%, the rate of m(V):m(Ti) was 0.127. And the prepared catalysts were characterized on the structure and morphology by XRD and XPS. According to the activity test and characterization, the relationship between the structure of catalysts and catalytic activity was analyzed. The results showed that vanadium ion was imbedded in the crystal structure of TiO₂, instead of creating crystal form V₂O₅ because of less V₂O₅ load amount. The chemical bonds of V-O-Ti and Ti-O-Si were formed. These chemical bonds might be the active site of catalysts, which may increase the catalytic activity of catalysts and strengthen the binding energy among the components of catalysts.