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

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.
Inventors:
 [1];  [2]
  1. (Winchester, MA)
  2. (Baton Rouge, LA)
Issue Date:
OSTI Identifier:
867641
Assignee:
Massachusetts Institute of Technology (Cambridge, MA) NETL
Patent Number(s):
US 4977123
Contract Number:
FC21-85MC22193
Research Org:
Massachusetts Institute of Technology (Cambridge, MA)
Country of Publication:
United States
Language:
English
Subject:
preparation; 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/