Highly efficient heterogeneous photooxidation of 2-propanol to acetone with amorphous manganese oxide catalysts
- Univ. of Connecticut, Storrs, CT (United States)
Amorphous manganese oxides, potassium oxalatomanganate complexes, and crystalline tunnel structure manganese oxides (hollandite, todorokite, pyrolusite) have been prepared and used as photocatalysts for the oxidation of 2-propanol to acetone. Amorphous mixed valent manganese oxides, a new class of photocatalytic materials, were the most active catalysts studied at room temperature under visible light illumination. High activities correlate with higher oxidation state manganese (Mn[sup 3+], Mn[sup 4+]) oxides, large surface oxygen concentrations, and the presence of hydroxyl groups on surfaces of these catalysts. BET (surface area analysis), XRD (X-ray diffraction), EDX (energy dispersive X-ray analysis), SEM (scanning electron microscopy), XPS (X-ray photoelectron spectroscopy), and FTIR (Fourier transform infrared) data support these correlations. A mechanism for these photooxidation flow reactions involving manganese oxide catalysts has been proposed. Photochemical and characterization data suggest that the design of active photocatalysts may rely on preparation of mixed valent amorphous oxides that release oxygen more readily than crystalline materials. Conversions as high as 8% and 100% selectivity to acetone have been realized with such systems. 45 refs., 9 figs., 1 tab.
- OSTI ID:
- 7102038
- Journal Information:
- Journal of the American Chemical Society; (United States), Vol. 116:12; ISSN 0002-7863
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ACETONE
SYNTHESIS
PROPANOLS
OXIDATION
AMORPHOUS STATE
CATALYSTS
GAS CHROMATOGRAPHY
INFRARED SPECTRA
MANGANESE OXIDES
PHOTOCHEMISTRY
PHOTOELECTRON SPECTROSCOPY
PHOTOLYSIS
SCANNING ELECTRON MICROSCOPY
THERMAL ANALYSIS
X-RAY DIFFRACTION
X-RAY SPECTROSCOPY
ALCOHOLS
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISTRY
CHROMATOGRAPHY
COHERENT SCATTERING
DECOMPOSITION
DIFFRACTION
ELECTRON MICROSCOPY
ELECTRON SPECTROSCOPY
HYDROXY COMPOUNDS
KETONES
MANGANESE COMPOUNDS
MICROSCOPY
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
SCATTERING
SEPARATION PROCESSES
SPECTRA
SPECTROSCOPY
TRANSITION ELEMENT COMPOUNDS
400201* - Chemical & Physicochemical Properties
400500 - Photochemistry
400102 - Chemical & Spectral Procedures