Abstract: In order to improve solid phase diffusion bondability at contact portions between a metal flat foil and a metal corrugated foil together constituting a metal honeycomb body for a catalyst converter used for purifying an exhaust gas and to improve engine durability, the present invention comprises one or combination of the following structures; a structure wherein at least one of the metal foils has a foil thickness of less than 40 &mgr;m; a structure wherein an Al content after bonding is at least 3%; a structure wherein the surface condition of both metal foils in a width-wise direction has a predetermined surface coarseness or a predetermined surface shape and condition; and a structure wherein the width of contact portions between both metal foils is at least five times the thickness of the metal foils.

Abstract: An air purification agent comprising a salt consisting essentially of hydrazine and one or more metal salts of Ni, Al, Zn, and Ti or comprising a shaped body of chain magnesium silicate as a carrier and a salt consisting essentially of the above metal salt and hydrazine supported thereon, the air purification agent being produced by immersing a chain magnesium silicate in a mixed aqueous solution of the above metal salt and hydrazine, then drying, whereby a salt of the metal salt and hydrazine is supported thereon or by immersing a chain magnesium silicate in an aqueous solution of the metal salt, immersing it in an aqueous solution of hydrazine, then drying, whereby a salt of the metal salt and hydrazine is caused to precipitate to support the same thereon.

Abstract: A composition having a strong air cleaning ability, comprising co-existent products comprised of a reaction product 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 or a reaction product with at least one acid or ascorbic acid, citric acid, tartaric acid and gluconic acid containing tannic acid and/or gallic acid, and an unreacted metal as mentioned above co-existing with the reaction product, and in some cases, further containing a co-existent product comprising iron hydroxide and/or a sulfide, and a method of preparing same.

Abstract: A component for deodorizing air or gas having a coexist compound as a deodorizing element, said coexist compound comprising a metal and a reaction product of the metal and an acid, wherein the metal is selected from at least one of Fe, Mn, Cr, Ni, Zn, Al and Cu, and the acid is selected from at least one of ascorbic acid, gluconic acid, citric acid, tartaric acid, tannic acid, gallic acid, EDTA and malic acid, wherein clean air or gas is passed through the deodorizing element to restore its deodorizing effect after a period of time sufficient for the deodorizing element to lose its deodorizing power.

Abstract: A composition for gas purification, comprising a reaction product of at least one metal selected from the group consisting of iron, manganese, chromium, nickel, zinc, aluminum, copper, tin and cobalt, and alloys containing these metal elements, with at least one oxypolybasic acid, wherein the metal co-exists therein while in an unreacted state.