Photoelectrochemistry of levulinic acid on undoped platinized n-TiO/sub 2/ powders
The photoelectrochemistry of levulinic (4-oxopentanoic) acid, the major product of controlled degradation of cellulose by acids, has been investigated. Since this acid can be present in waste streams of biomass processing, we investigated the photoelectrochemical reactions of this acid on slurries composed of semiconductor/metal particles. The semiconductor investigated was platinized undoped n-TiO/sub 2/, as anatase, anatase-rutile mixture, or rutile. The effects of the level of platinization, pH, acid concentration, and the semiconductor surface area were investigated. In addition to the decarboxylation reaction leading to methyl ethyl ketone, we have also observed novel cleavages of the C-C backbone leading to propionic acid, acetic acid, acetone, and acetaldehyde as major products. These lower molecular weight carboxylic acids undergo decarboxylation at the slurry diodes to ethane and methane. The organic product distribution is a complex function of the crystallographic phase of n-TiO/sub 2/ and of the level of metallization of the semiconductor powder. 2 figures, 1 table.
- Research Organization:
- Solar Energy Research Inst., Golden, CO
- OSTI ID:
- 5559140
- Journal Information:
- J. Phys. Chem.; (United States), Vol. 87:16
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
36 MATERIALS SCIENCE
ACETALDEHYDE
CHEMICAL REACTION YIELD
ACETONE
CARBON DIOXIDE
ETHANE
LEVULINIC ACID
DECARBOXYLATION
METHANE
SEMICONDUCTOR MATERIALS
CRYSTAL STRUCTURE
SURFACE AREA
BIOCONVERSION
CELLULASE
ELECTROCHEMISTRY
ELECTRODEPOSITION
EXPERIMENTAL DATA
GAS CHROMATOGRAPHY
HYDROLYSIS
MASS SPECTRA
PARTICLE SIZE
PH VALUE
PHOTOCHEMICAL REACTIONS
PHOTOCHEMISTRY
PHOTOELECTROCHEMICAL CELLS
PLATINUM
POWDERS
QUANTITY RATIO
SLURRIES
TIME DEPENDENCE
TITANIUM OXIDES
X-RAY DIFFRACTION
ALDEHYDES
ALKANES
CARBON COMPOUNDS
CARBON OXIDES
CARBOXYLIC ACIDS
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISTRY
CHROMATOGRAPHY
COHERENT SCATTERING
DATA
DECOMPOSITION
DEPOSITION
DIFFRACTION
DISPERSIONS
ELECTROCHEMICAL CELLS
ELECTROLYSIS
ELEMENTS
ENZYMES
EQUIPMENT
GLYCOSYL HYDROLASES
HYDROCARBONS
HYDROLASES
INFORMATION
KETO ACIDS
KETONES
LYSIS
MATERIALS
METALS
MIXTURES
NUMERICAL DATA
O-GLYCOSYL HYDROLASES
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PLATINUM METALS
SCATTERING
SEPARATION PROCESSES
SIZE
SOLAR EQUIPMENT
SOLVOLYSIS
SPECTRA
SURFACE COATING
SURFACE PROPERTIES
SUSPENSIONS
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
YIELDS
400400* - Electrochemistry
400500 - Photochemistry
400201 - Chemical & Physicochemical Properties
360202 - Ceramics
Cermets
& Refractories- Structure & Phase Studies