Preparation of extrusions of bulk mixed oxide compounds with high macroporosity and mechanical strength

Patent · Tue Dec 11 04:00:00 EST 1990

OSTI ID:5162839

Ftytzani-Stephanopoulos, M; Jothimurugesan, K

This paper discusses a method of preparing bodies of bulk metal oxide-based solid catalysts and absorbents having controllable surface area greater than 5 m{sup 2}/g, macroporosity, high pore volume. It comprises a compressive crush strength in the range of approximately 1-10 lb/mm.; preparing a citrate precursor having, in desired proportions metals selected from the group consisting of aluminum, zinc, transition metals, alkali metals, alkaline earth elements, rare earth elements and mixtures thereof; calcining the citrate precursor at a temperature ranging between 550{degrees}C.-850{degrees}C. for approximately 4-8 hours to yield a highly dispersed and macroporous metal oxide solid; treating the metal oxide solid by crushing the sizing to yield a highly dispersed, macroporous powder having a continuous particle size distribution such that fine and coarse size particles are retained, and macropores, in the size range of 0.1 {mu}m to 25 {mu}m in diameter, comprise at least 60% of the total pore volume of the powder and the remaining pores have a diameter less than 0.1{mu}m; adding about 2-7 percent by weight of a clay binder material to the powder; forming solid bodies from the powder; shaping the bodies to an appropriate size and shape; drying the bodies in air at 100{degrees}C.-120{degrees}C. for approximately 16 hours; and heat treating the bodies for approximately 2-6 hours at a temperature in the range of approximately 650{degrees}C.-850{degrees}C. This paper discusses the product produced by the method.

• Assignee: MIT, Cambridge, MA (USA)
• Patent Number(s): A; US 4977123
• Application Number: PPN: US 7-208378
• OSTI ID: 5162839
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360203 -- Ceramics
Cermets
& Refractories-- Mechanical Properties
CARBOXYLIC ACID SALTS
CHALCOGENIDES
CITRATES
COMPRESSION STRENGTH
ELEMENTS
EXTRUSION
FABRICATION
MATERIALS WORKING
MECHANICAL PROPERTIES
METALS
OXIDES
OXYGEN COMPOUNDS
POROSITY
RARE EARTHS
SYNTHESIS