Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Metal – metal oxide or metal hydroxide
Patent
1991-10-07
1993-07-13
Garvin, Patrick P.
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
Metal, metal oxide or metal hydroxide
502300, 502305, 502324, 502325, 502340, 502345, 502406, 502414, B01J 2300
Patent
active
052273580
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
The present invention relates to a composition having a strong air cleaning ability which can be used as an air cleaning material for cleaning polluted air containing toxic gases such as nitrogen oxides (NC.sub.x), sulfur oxides (SO.sub.x), and ozone (O.sub.3) gas; nitrogen compound type gases such as ammonia (NH.sub.3); sulfur compound type gases such as hydrogen sulfide (H.sub.2 S); carboxyl group type gases such as acetaldehyde; and carboxylic acid type gases such as acetic acid; or as a material for cleaning the air of combusted discharge gases or toxic gases, and a method of preparing same. The composition of the present invention also can be used as a food freshness retaining agent.
2. Background Art
The content of NO.sub.x gases, SO.sub.x gases and O.sub.3 gas in the air must be reduced because they are a cause of aspiratory organ diseases, and various fuel devices, gas cleaning devices, and chemical treatment devices are used to prevent generation thereof, or to reduce the concentration thereof, in the air. Nevertheless, a method of efficiently removing these toxic gases from polluted air, by using simple equipment, has not been generally realized.
Nitrogen compound type gases or sulfur compound type gases in the air, which are a cause of objectionable odors, have been treated to remove these objectionable odors by the adsorption method using activated charcoal, the masking method using other fragrances, and the chemical method of carrying out a chemical reaction of odorous gases.
These deodorants of the prior art, however, have a problem in that the deodorizing ability thereof is soon lost.
The present inventors previously considered that the product of a reaction of a metal with a polybasic acid has a strong air cleaning effect, and filed an application for this invention under Japanese Patent Application No. 1-280776.
DISCLOSURE OF THE INVENTION
The object of the present invention is to provide a
new air cleaning composition by which harmful NO.sub.x gases, SO.sub.x gases and O.sub.3 gas are removed, to thereby clean the air, and at the same time, carboxyl group type gases, carboxylic acid type gases, nitrogen compound type gases, and sulfur compound type gases are removed.
Another object of the present invention is to provide a new air cleaning composition having a strong absorption ability which is able to remove toxic gases contained in gases discharged from internal combustion engines, objectionable odors, and toxic gases generated by chemical plants. In the present specification, the capability of removing such toxic gases and objectionable gases is called a strong air cleaning ability.
A further object of the present invention is to provide an air cleaning composition which can exhibit a strong air cleaning ability even when used over a long term.
In accordance with the present invention, there is provided a composition having a strong air cleaning ability and comprising, a product of a reaction of at least one metal selected from Fe, Mn, Cr, Ni, Zn, Al and Cu and alloys containing these metal elements with tannic acid and/or gallic acid, and a co-existent material consisting of an unreacted metal as mentioned above coexisting in the reaction product.
In accordance with the present invention, there is further provided a composition having a strong air cleaning ability and comprising, a product of a reaction of at least one metal selected from Fe, Mn, Cr, Ni, Zn, Al and Cu and alloys containing these metal elements with at least one acid selected from ascorbic acid, citric acid, tartaric acid and gluconic acid containing tannic acid and/or gallic acid, and a co-existent material consisting of an unreacted metal as mentioned above coexisting with the reaction product, and further, a coexistent material consisting of iron hydroxide and/or a sulfide.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is an illustration of the closed type deodorizing test vessel used in Example 2.
BEST MODE OF CARRYING OUT THE INVENTION
The present inventors found that, when a met
REFERENCES:
patent: 3578508 (1967-04-01), Pearlman
World Patents Index Latest, JP-A-1272868 (1989).
World Patents Index Latest, JP-A-1266275 (1989).
World Patents Index Latest, JP-A-3188939 (1989).
World Patents Index, JP-A-54008725 (1979).
Noda Tamio
Takemura Yozo
Garvin Patrick P.
Nippon Steel Corporation
Peebles Brent M.
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