Document Type : Research Paper
Chemistry Department of Imam Hussein University, Tehran, I.R. Iran
The special application of iron-manganese oxide nanocatalysts has been investigated in decomposition of hydrogen peroxide. In this research, iron-manganese oxide nanocomposites were synthesized by co-precipitation, sol-gel and mechanochemical methods using iron (III) nitrate, iron (II) sulfate and manganese (II) nitrate as starting materials. These nanocomposites were prepared on the various catalyst beds. The polyvinyl pyrrolidon was used as a capping agent to control the agglomeration of the nanoparticles. Nanocatalysts were identified by FT-IR, XRD and SEM. The sizes of nanoparticles were determined by XRD data and Scherer equation. Catalytic activity of prepared samples by co-precipitation method was higher than the samples prepared by other methods. Based on surface area analysis and BET data, using of sodium metasilicate bed led to the high surface area and catalytic activity. To optimize the catalytic activity of nanoparticles factors such as concentration, cations ratio, pH and calcination temperature were investigated.