Method for preparation of a catalyst for purifying exhaust gas

Details Method for preparation of a catalyst for purifying exhaust gas Method for preparation of a catalyst for purifying exhaust gas

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.

REFERENCES:
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patent: 5036043 (1991-07-01), Subramanian
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patent: 5232964 (1993-08-01), Wenger
patent: 5340794 (1994-08-01), Tallon
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.

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