Title:
METHOD FOR REDUCING SULFUR TRIOXIDE
Document Type and Number:
Japanese Patent JP3495542
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To reduce and remove the SO3 discharged from a boiler waste gas by bringing the combustion gas admixed with ammonia into contact with an Ir carrying catalyst.
SOLUTION: Three parts of alumina sol, 55 parts of silica sol and 200 parts of water are added as a binder to 100 parts of H-type metallosilicate and sufficiently agitated to obtain a slurry for a wash coat. Subsequently, a monolithic substrate for cordierite is dipped in the wash-coat slurry, brought out and then dried at 200°C after the excess slurry is swept off. The coat is deposited by 200g per 1 of the substrate to obtain a honeycomb coat. The honeycomb coat is dipped in iridium chloride (2.88g IrCl4.H2O/200cc of H2O) and impregnated for 1hr, the liq. depositing on the substrate wall is scraped off, and the coat is dried at 200°C. The coat is then purged with a nitrogen atmosphere at 500°C to obtain a honeycomb catalyst. The SO3 discharged from the boiler waste gas, etc., is removed in this way.
Inventors:
Shigeru Nojima
Kozo Iida
Osamu Naito
Kazumasa Uchihashi
Kozo Iida
Osamu Naito
Kazumasa Uchihashi
Application Number:
JP3159197A
Publication Date:
February 09, 2004
Filing Date:
February 17, 1997
Export Citation:
Assignee:
MITSUBISHI HEAVY INDUSTRIES,LTD.
International Classes:
B01J23/46; B01D53/86; (IPC1-7): B01D53/86; B01J23/46
Attorney, Agent or Firm:
Ryoichi Hagiwara (1 person outside)
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