Toda Kogyo Corporation

Sumitomo Special Metals Co., Ltd.

Other

Agency of Industrial Science and Technology

Tomoyuki Imai

Toshiki Matsui

Yasuhiko Fujii

Tomoko Okita

Satoshi Hatakeyama

Nanao Horiishi

Hiroshi Inoue

Masaki Ishihara

Takaki Hamada

Masaru Isoai

Atsushi Hamamura

Kazuyuki Hayashi

Koso Aoki

Tosiharu Harada

Akio Mishima

Yoshiro Okuda

Akira Mukaizaka

Masaaki Fukugauchi

Hiroko Nakamura

Masayuki Ukita

Kojiro Tsutsumi

Takashi Okamura

Tatsuaki Baba

Toshiyuki Hakata

Kyoji Kaeriyama

Yoshio Suda

Yukimichi Nakao

Suminori Tanaka

Masayuki Okamoto

Osamu Oze

Hideto Yoshida

Takahiro Imano

Kouki Tokuhara

Yukimitsu Miyao

Toshiaki Shimuzu

An iron compound catalyst for inhibiting the generation of dioxin contains iron oxide particles, iron oxide hydroxide particles or mixed particles having a catalytic activity capable of converting not less than 15% of carbon monoxide into carbon dioxide when 2.8&times;10&minus;4 mol of iron oxide particles obtained by heat-treating the iron compound catalyst in air at a temperature of 800&deg; C. for 15 minutes, are instantaneously contacted with 6.1&times;10&minus;7 mol of carbon monoxide at a temperature of 250&deg; C. at a space velocity (SV) of 42,400 h&minus;1 in an inert gas atmosphere using a pulse catalytic reactor, the iron oxide particles or the iron oxide hydroxide particles have an average particle size of 0.01 to 2.0 &mgr;m, a BET specific surface area of 0.2 to 200 m2/g, a phosphorus content of not more than 0.02% by weight, a sulfur content of not more than 0.6% by weight and a sodium content of not more than 0.5% by weight. This iron compound catalyst enables complete combustion of municipal solid waste and decomposition of dioxin precursors even at a low combustion temperature in intermittently operated incinerators such as mechanical batch incinerators or semi-continuous incinerators, and can inhibit dioxin generation of due to a memory effect upon low-temperature combustion at the start-up or shut-down of the incinerators, without large-scale incinerator renovation or plant and equipment investment.

Iron compound catalyst for inhibiting generation of dioxin

The present invention relates to a process for treating a dioxin-containing exhaust gas which can inhibit the generation of dioxin occurring either in the course of cooling of the exhaust gas between a downstream portion subsequent to a combustion chamber and a dust collector or due to a memory effect upon low-temperature combustion in flues or dust collector at the start-up or shut-down of intermittent operation-type solid waste incinerators, without large-scale incineration facilities or plant renovation and equipment investment, and a composite catalyst composition for inhibiting the generation of dioxin, comprising an iron compound, an acid gas neutralizing agent and optionally an activated carbon.

Process for treating dioxin-containing exhaust gas and composite catalyst composition for inhibiting generation of dioxin

Calcium-iron oxide composite particles

Method for treating organohalogen compound-containing soil or ash

Composite catalyst composition for inhibiting generation of dioxin

Resin composition and laminated film

An iron compound catalyst for inhibiting the generation of dioxin of the present invention, comprise iron oxide particles, iron oxide hydroxide particles or mixed particles thereof having a catalytic activity capable of converting not less than 15 % of carbon monoxide into carbon dioxide when 2.8&times;10,mol of iron oxide particles obtained by heat-treating said iron compound catalyst in air at a temperature of 800&deg; C. for 15 minutes, are instantaneously contacted with 6.1&times;10,mol of carbon monoxide at a temperature of 250&deg; C. at a space velocity (SV) of 42,400 h,in an inert gas atmosphere using a pulse catalytic reactor, the iron oxide particles or said iron oxide hydroxide particles having an average particle size of 0.01 to 2.0 &mgr;m, a BET specific surface area of 0.2 to 200 m,/g, a phosphorus content of not more than 0.02 % by weight, a sulfur content of not more than 0.6 % by weight and a sodium content of not more than 0.5 % by weight. Such an iron compound catalyst enables complete combustion of the municipal solid waste and decomposition of dioxin precursors even at a low combustion temperature in intermittently operated incinerators such as mechanical batch incinerators or semi-continuous incinerators, and can inhibit the generation of dioxin due to a memory effect upon low-temperature combustion at the start-up or shut-down of the incinerators, without large-scale incinerator renovation or plant and equipment investment.

Iron compound catalyst for inhibiting generation of dioxin and incineration process of municipal solid waste using the same

Catalyst for decomposing organohalogen compound

Calcium-iron oxide composite particles and resin molded product containing the same

A dust-removing synthetic resin filter of the present invention comprises a filter material which comprises: synthetic resin fibers; and iron oxide particles having a catalytic activity to chlorine or hydrogen chloride gas. Such a dust-removing synthetic resin filter is capable of so-called clean combustion which is free from discharge of harmful substances upon incineration thereof and is advantageous from the standpoint of preventing environmental pollution.

Dust-removing synthetic resin filter

A method of decoloring a colored concrete, comprises adding to the colored concrete, a decoloring pigment comprising a titanium oxide pigment, or a titanium oxide pigment and a pigment having a complementary color relative to color of the colored concrete. Such method can decolore the color of the colored concrete residue which attaches to or remains in production facilities in order to return a color thereof to that of an ordinary plain concrete, without works or treatments for washing-out or removing the colored concrete residue which attaches to or remains in the production facilities, in which the works or treatments are required in the case where the production facilities are used for the production of an ordinary plain concrete after the colored concrete has been produced therein, and without works or treatments for purifying a waste water generated upon washing-out or removing the residue and for making the waste water harmless; and a pigment used therefor.

Method of decoloring colored concrete

Disclosed herein is superparamagnetic fine particles of iron oxide having an unsaturated fatty acid adsorbed on the surface of superparamagnetic fine particles and having a magnetization of not less than 50 emu/g, the rate of change of the magnetization of not more than 10%, and an Fe.sup.2+ content (calculated as Fe.sup.2+ /Fe.sup.3+ molar ratio) of 0.16-0.5.

Superparamagnetic fine particles of iron oxide and magnetic recording

Disclosed herein is superparamagnetic fine particles of iron oxide having an unsaturated fatty acid adsorbed on the surface of superparamagnetic fine particles, and having a magnetization of not less than 50 emu/g, the rate of change of the magnetization of not more than 10%, and an Fe.sup.2+ content (calculated as Fe.sup.2+ /Fe.sup.3+ molar ratio) of 0.16-0.5.

To obtain an anticorrosive Fe-B-R type permanent magnet; in particular, to reduce deterioration rate of the initial magnetic properties below 10% after the magnet has been kept at 80.degree. C. in 90% relative humidity for 500 hours, the surface of the sintered permanent magnet is coated with metallic coating film layers of at least one noble metal layer and at least one base metal layer disposed on the noble metal layer. Diffusion heat treatment further improves the adhesiveness of the coating film layers.

Process for producing a corrosion resistant permanent magnet

A corrosion-resistant R-Fe-B type sintered permanent magnet exhibiting deterioration of not more than 5 % from the initial magnetic properties after being tested for 500 hours under the conditions of a temperature of 80.degree. C. and a relative humidity of 90 % is produced by:

Corrosion-resistant permanent magnet and method for preparing the same

Growing community of inventors

Hiroshima, Japan

Tomoyuki Imai