Plastic and nonmetallic article shaping or treating: processes – Outside of mold sintering or vitrifying of shaped inorganic... – Including plural heating steps
Patent
1996-02-23
1998-10-20
Derrington, James
Plastic and nonmetallic article shaping or treating: processes
Outside of mold sintering or vitrifying of shaped inorganic...
Including plural heating steps
264653, 264662, 423593, 501780, C04B 3332
Patent
active
058242627
ABSTRACT:
These methods relate to the preparation of a YBa.sub.2 Cu.sub.3 O.sub.7 -d catalyst for purifying an exhaust gas. The method comprises steps of mixing Y.sub.2 O.sub.3, Ba.sub.2 CO.sub.3 and CuO at a mole ratio of 1:4:6, respectively; grinding the resultant mixture to obtain fine powder having a size of at least 200 mesh; sintering the fine powder at temperature of 800.degree. C. to 900.degree. C. under an atmosphere of oxygen; annealing the fine powder to room temperature; pelletizing the powder to form pellets; grinding the pellets to obtain fine powder having a size of at least 200 mesh; re-sintering the resultant fine powder at a temperature of 800.degree. C. to 920.degree. C.; and re-annealing the fine powder to room temperature.
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Kenji Tabata et al, Uptake of NO Gas by YBa.sub.2 Cu.sub.3 O.sub.y, The Chemical Society of Japan, 1988, Chemical Letters, pp. 790-802.
Choi Kyu-Hun
Chung Sok-Jin
Kim Sang-Ho
Derrington James
Kia Motors Corporation
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