Preparation of extrusions of bulk mixed oxide compounds with high macroporosity and mechanical strength
- Winchester, MA
- Baton Rouge, LA
A simple and effective method for producing bulk single and mixed oxide absorbents and catalysts is disclosed. The method yields bulk single oxide and mixed oxide absorbent and catalyst materials which combine a high macroporosity with relatively high surface area and good mechanical strength. The materials are prepared in a pellet form using as starting compounds, calcined powders of the desired composition and physical properties these powders are crushed to broad particle size distribution, and, optionally may be combined with an inorganic clay binder. The necessary amount of water is added to form a paste which is extruded, dried and heat treated to yield and desired extrudate strength. The physical properties of the extruded materials (density, macroporosity and surface area) are substantially the same as the constituent powder is the temperature of the heat treatment of the extrudates is approximately the same as the calcination temperature of the powder. If the former is substantially higher than the latter, the surface area decreases, but the macroporosity of the extrusions remains essentially constant.
- Research Organization:
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
- DOE Contract Number:
- FC21-85MC22193
- Assignee:
- Massachusetts Institute of Technology (Cambridge, MA)
- Patent Number(s):
- US 4977123
- OSTI ID:
- 867641
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
extrusions
bulk
mixed
oxide
compounds
macroporosity
mechanical
strength
simple
effective
method
producing
single
absorbents
catalysts
disclosed
yields
absorbent
catalyst
materials
combine
relatively
surface
prepared
pellet
form
starting
calcined
powders
desired
composition
physical
properties
crushed
broad
particle
size
distribution
optionally
combined
inorganic
clay
binder
amount
water
added
paste
extruded
dried
heat
treated
yield
extrudate
density
substantially
constituent
powder
temperature
treatment
extrudates
approximately
calcination
former
latter
decreases
remains
essentially
constant
mixed oxide
bulk single
catalyst material
size distribution
physical properties
particle size
heat treatment
heat treated
mechanical strength
oxide compounds
essentially constant
effective method
catalyst materials
pellet form
/502/423/