title: Chemical-physical properties of spinel CoMn2O4 nano-powders and catalytic activity in the 2-propanol and toluene combustion: Effect of the preparation method.
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.
authors.affiliation: Department of Applied Chemistry and Chemical Engineering, Faculty of Chemistry, University of Tabriz, Tabriz, Iran. s_ali_hosseini@yahoo.com
authors.forename: Seyed Ali
authors.initials: SA
authors.lastname: Hosseini
authors.forename: Dariush
authors.initials: D
authors.lastname: Salari
authors.forename: Aligholi
authors.initials: A
authors.lastname: Niaei
authors.forename: Francesca
authors.initials: F
authors.lastname: Deganello
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Pantaleo
authors.forename: Pejman
authors.initials: P
authors.lastname: Hojati
mesh_terms: D019840:2-Propanol / Q000737:chemistry*; D000393:Air Pollutants / Q000737:chemistry*; D000537:Aluminum Oxide / Q000737:chemistry*; D002384:Catalysis; D011232:Chemical Precipitation; D003035:Cobalt / Q000737:chemistry*; D008277:Magnesium Oxide / Q000737:chemistry*; D017895:Manganese Compounds / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D049329:Nanostructures / Q000737:chemistry*; D044367:Phase Transition; D017550:Spectroscopy, Fourier Transform Infrared; D013696:Temperature; D014050:Toluene / Q000737:chemistry*; D055549:Volatile Organic Compounds / Q000032:analysis* / Q000737:chemistry; D014961:X-Ray Diffraction
chemical_list: D000393:Air Pollutants; D017895:Manganese Compounds; D055549:Volatile Organic Compounds; C111130:spinell; D008277:Magnesium Oxide; D014050:Toluene; D003035:Cobalt; D000537:Aluminum Oxide; D019840:2-Propanol