Co-SiO_2 Catalysts for Highly Efficient,Catalytic Decomposition of H_2O_2 at Low-temperature

Hydrogen peroxide is often used as a green oxidizing reagent in both industry and lab processes.Its residues have to be decomposed,otherwise will lead to polluting the environment in some degree.In this paper,M-SiO2(M=Ni、Zn、Fe、Bi、Cu、Al、Cd、Co) catalysts were synthesized by sol-gel method.The catalytic properties of catalysts on decomposition of H2O2 were investigated at low temperature(5 ℃ to 20 ℃).Among these catalysts,the results showed that the Co-SiO2 catalysts displayed excellent catalytic performance on decomposition of H2O2 in the range of 5 ℃ to 20 ℃.At 5 ℃,0.05 g 8.0%(by mass) Co-SiO2 catalyst after reacting 40 min with 10 mL 1.0 mol/L H2O2,H2O2 decomposition rate was 71.7%;at 20 ℃,it was nearly 100%.The representative Co-SiO2 catalysts were characterized by XRD.The results indicated that the Co is highly dispersed in SiO2.