Product selectivity during CH/sub 2/OH decomposition on TiO/sub 2/ powders
Journal Article
·
· J. Phys. Chem.; (United States)
The authors show that the product selectivity during the temperature-programmed decomposition of CH/sub 3/OH on TiO/sub 2/ is a strong function of the initial CH/sub 3/OH coverage. For low coverages, the dissociated CH/sub 3/OH protons react with residual HO/sub (a)/ groups on the TiO/sub 2/ surface, leading to the desorption of H/sub 2/O and leaving behind isolated CH/sub 3/O/sub (a)/ groups that are stable to 673 K. For higher coverages a range of additional products is observed, including recombined CH/sub 3/OH, CH/sub 3/OCH/sub 3/, and CH/sub 2/O below 673 K and CO, CO/sub 2/, and CH/sub 4/ at higher temperature. They propose a model in which the decomposition selectivity is determined by the coverage of neighboring HO/sub (a)/, CH/sub 3/O/sub (a), and O/sup 2 -///sub (a)/ species. In the case of HO/sub (a)/ species, evidence suggest that surface diffusion of protons from non-nearest-neighbor sites also affects the decomposition selectivity. The product selectivity is compared with that observed when CH/sub 3/OH decomposes on ZnO, and differences are discussed in terms of the relative strengths of HO/sub (a)/ and CH/sub 3/O/sub (a)/ bonds on the two surfaces
- Research Organization:
- Univ. of Minnesota, Minneapolis
- OSTI ID:
- 5355367
- Journal Information:
- J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 92:2; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
02 PETROLEUM
020400 -- Petroleum-- Processing
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALCOHOLS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTION YIELD
DATA
DISSOCIATION
DISTRIBUTION
EXPERIMENTAL DATA
HIGH TEMPERATURE
HYDROXY COMPOUNDS
INFORMATION
INFRARED SPECTRA
MEDIUM TEMPERATURE
METHANOL
NUMERICAL DATA
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
QUANTITY RATIO
SORPTION
SORPTIVE PROPERTIES
SPATIAL DISTRIBUTION
SPECTRA
SURFACE PROPERTIES
TEMPERATURE DEPENDENCE
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
YIELDS
020400 -- Petroleum-- Processing
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALCOHOLS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTION YIELD
DATA
DISSOCIATION
DISTRIBUTION
EXPERIMENTAL DATA
HIGH TEMPERATURE
HYDROXY COMPOUNDS
INFORMATION
INFRARED SPECTRA
MEDIUM TEMPERATURE
METHANOL
NUMERICAL DATA
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
QUANTITY RATIO
SORPTION
SORPTIVE PROPERTIES
SPATIAL DISTRIBUTION
SPECTRA
SURFACE PROPERTIES
TEMPERATURE DEPENDENCE
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
YIELDS