Preparation of ultrafine catalyst powders using a flow-through hydrothermal process
The rapid thermal decomposition of solutes (RTDS) process was used to produce ultrafine iron-bearing oxide and hydroxide powders for use as coal liquefaction catalysts. The RTDS process subjects aqueous solutions containing dissolved metal salts to elevated temperatures and pressures in a flow-through apparatus. Particle formation is initiated during brief exposure of the solution to a heated region, then is quenched by abruptly cooling and depressurizing the suspension. Powders having individual crystallites on the nanometer to tens-of-nanometer size scale are readily produced by the RTDS method. Variations in RTDS processing parameters (e.g., solute concentration, flow rate, processing temperature) affect the crystallinity, morphology, and size of particles produced. Powders generated using the RTDS process were characterized using XRD, EXAFS, electron microscopy, Mossbauer spectroscopy, and BET surface area analysis.
- Research Organization:
- Pacific Northwest Lab., Richland, WA (United States)
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC06-76RL01830
- OSTI ID:
- 6562886
- Report Number(s):
- PNL-SA-21665; CONF-930304-15; ON: DE93011603
- Resource Relation:
- Conference: 205. American Chemical Society national meeting, Denver, CO (United States), 28 Mar - 2 Apr 1993
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CATALYSTS
CHEMICAL PREPARATION
COAL LIQUEFACTION
SOLUTES
PYROLYSIS
ELECTRON MICROSCOPY
IRON HYDROXIDES
IRON OXIDES
PARTICLE SIZE
SURFACE AREA
X-RAY DIFFRACTION
CHALCOGENIDES
CHEMICAL REACTIONS
COHERENT SCATTERING
DECOMPOSITION
DIFFRACTION
HYDROGEN COMPOUNDS
HYDROXIDES
IRON COMPOUNDS
LIQUEFACTION
MICROSCOPY
OXIDES
OXYGEN COMPOUNDS
SCATTERING
SIZE
SURFACE PROPERTIES
SYNTHESIS
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS
010405* - Coal
Lignite
& Peat- Hydrogenation & Liquefaction