Monolayer structures of niobic acids supported on SiO[sub 2] and their catalytic activities for esterification of acetic acid with ethanol
Journal Article
·
· Journal of Physical Chemistry; (United States)
- Univ. of Tokyo (Japan)
New submonolayer niobic acid catalysts were prepared by the reaction of Nb(OC[sub 2]H[sub 5])[sub 5] with surface OH groups of SiO[sub 2], followed by H[sub 2]O treatment. The surface structures were characterized by means of EXAFS, XRD, XRF, and FT-IR. The niobic acids on SiO[sub 2] up to 8.0 wt % Nb loadings were found to grow in a monolayer mode. These catalysts showed activities 20 times as large as that of a niobic acid bulk catalyst for the esterification of acetic acid with ethanol. The activity was referred to Lewis acid sites in the monolayer structure, which was stable even after evacuation at high temperatures such as 873 K.
- OSTI ID:
- 6837327
- Journal Information:
- Journal of Physical Chemistry; (United States), Journal Name: Journal of Physical Chemistry; (United States) Vol. 95:24; ISSN JPCHAX; ISSN 0022-3654
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ABSORPTION SPECTROSCOPY
ACETIC ACID
ALCOHOLS
CARBOXYLIC ACIDS
CATALYST SUPPORTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL ANALYSIS
CHEMICAL PREPARATION
CHEMICAL REACTIONS
COHERENT SCATTERING
DATA
DIFFRACTION
ESTERIFICATION
ETHANOL
EXPERIMENTAL DATA
FINE STRUCTURE
FOURIER ANALYSIS
HYDROGEN COMPOUNDS
HYDROXY COMPOUNDS
INFORMATION
INFRARED SPECTRA
INORGANIC ACIDS
LEWIS ACIDS
MONOCARBOXYLIC ACIDS
NIOBIUM COMPOUNDS
NIOBIUM OXIDES
NONDESTRUCTIVE ANALYSIS
NUMERICAL DATA
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
REFRACTORY METAL COMPOUNDS
SCATTERING
SILICON COMPOUNDS
SILICON OXIDES
SPECTRA
SPECTROSCOPY
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS
X-RAY DIFFRACTION
X-RAY EMISSION ANALYSIS
X-RAY FLUORESCENCE ANALYSIS
X-RAY SPECTROSCOPY
400201* -- Chemical & Physicochemical Properties
ABSORPTION SPECTROSCOPY
ACETIC ACID
ALCOHOLS
CARBOXYLIC ACIDS
CATALYST SUPPORTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL ANALYSIS
CHEMICAL PREPARATION
CHEMICAL REACTIONS
COHERENT SCATTERING
DATA
DIFFRACTION
ESTERIFICATION
ETHANOL
EXPERIMENTAL DATA
FINE STRUCTURE
FOURIER ANALYSIS
HYDROGEN COMPOUNDS
HYDROXY COMPOUNDS
INFORMATION
INFRARED SPECTRA
INORGANIC ACIDS
LEWIS ACIDS
MONOCARBOXYLIC ACIDS
NIOBIUM COMPOUNDS
NIOBIUM OXIDES
NONDESTRUCTIVE ANALYSIS
NUMERICAL DATA
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
REFRACTORY METAL COMPOUNDS
SCATTERING
SILICON COMPOUNDS
SILICON OXIDES
SPECTRA
SPECTROSCOPY
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS
X-RAY DIFFRACTION
X-RAY EMISSION ANALYSIS
X-RAY FLUORESCENCE ANALYSIS
X-RAY SPECTROSCOPY