Chemical-physical properties of spinel CoMn2O4 nano-powders and catalytic activity in the 2-propanol and toluene combustion: Effect of the preparation method

J Environ Sci Health A Tox Hazard Subst Environ Eng. 2011;46(3):291-7. doi: 10.1080/10934529.2011.539093.

Abstract

Spinel-type CoMn(2)O(4)nano-powders are prepared using sol-gel auto combustion (SGC) and co-precipitation (CP) methods and their catalytic activities are evaluated in combustion of 2-propanol and toluene. The chemical-physical properties of the oxides are characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), N(2)-adsorption-desorption, temperature programmed reduction (TPR) and scanning electron microscopy (SEM). After calcination at 700°C, CoMn(2)O(4)-SGC shows higher amounts of the normal-type spinel phase and is more crystalline than CoMn(2)O(4)-CP. Higher calcination temperatures (850°C) do not affect very much the weight percentage of the normal-type spinel phase; although the crystal size slightly increased. The TPR analysis evidences a large number of Mn(3+) cations in CoMn(2)O(4)-SGC compared to CoMn(2)O(4)-CP. This difference, together with the higher surface area, could justify the higher activity of CoMn(2)O(4)-SGC in both the investigated reactions.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • 2-Propanol / chemistry*
  • Air Pollutants / chemistry*
  • Aluminum Oxide / chemistry*
  • Catalysis
  • Chemical Precipitation
  • Cobalt / chemistry*
  • Magnesium Oxide / chemistry*
  • Manganese Compounds / chemistry*
  • Microscopy, Electron, Scanning
  • Nanostructures / chemistry*
  • Phase Transition
  • Spectroscopy, Fourier Transform Infrared
  • Temperature
  • Toluene / chemistry*
  • Volatile Organic Compounds / analysis*
  • Volatile Organic Compounds / chemistry
  • X-Ray Diffraction

Substances

  • Air Pollutants
  • Manganese Compounds
  • Volatile Organic Compounds
  • spinell
  • Magnesium Oxide
  • Toluene
  • Cobalt
  • Aluminum Oxide
  • 2-Propanol