Ngk Insulators, Inc.

Other

Nkk Corporation

Nippon Shokubai Kagaku Kogyo Co., Ltd.

Hiraoka, Masakatsu

Masakatsu Hiraoka

Yoshinori Imoto

Katsunosuke Hara

Yasuo Suzuki

Takashi Yokoyama

Toshihiko Iwasaki

Haruhito Tsuboi

Miki Yamagishi

Katsuhiro Tokura

Takashi Noto

Osamu Ishikawa

Akira Inoue

Kunio Sano

Kazuyuki Oshita

An adsorbent and process for producing an absorbent capable of decomposing an organic halogen compound, is provided. The adsorbent can adsorb organic halogen compounds contained in waste gases and can assuredly decompose them without synthesizing them. A salt of Pt and/or Pd, an organic titanium compound and an organic binder are reacted in a solvent, to thereby synthesize a dispersion of an organic metal compound precursor containing Pt and/or Pd and Ti in molecules thereof, a sol of TiO is added to the dispersion to prepare a catalyst-coating solution, an activated carbon is impregnated with the catalyst-coating solution, and the resulting mixture is heated, thereby allowing the activated carbon to carry thereon an organic halogen compound-decomposing catalyst comprising TiO and, dispersed therein, fine particles of Pt and/or Pd. In a low temperature range of to &deg; C. in which the activated carbon is usable, organic halogen compounds in the exhaust gases can be decomposed, and SOx, NOx, HCl and heavy metals can be removed through adsorption.

Adsorbent having capability of decomposing organic halogen compounds and method for producing the same

A method for removing nitrogen oxides and organic chlorine compounds from a combustion waste gas, which comprises the steps of: adding ammonia (NH.sub.3) as a reducing agent to a combustion waste gas containing nitrogen oxides and organic chlorine compounds; causing the combustion waste gas added with ammonia to contact with, while keeping the temperature of the combustion waste gas within a prescribed range, with a catalyst comprising at least one selected from the group consisting of platinum (Pt), palladium (Pd), ruthenium (Ru), manganese (Mn), copper (Cu), chromium (Cr) and iron (Fe) and oxides thereof, supported on the surface of a carrier comprising at least one selected from the group consisting of titanium oxide (TiO.sub.2), silicon oxide (SiO.sub.2), aluminum oxide (Al.sub.2 O.sub.3) and zirconium oxide (ZrO.sub.2), thereby removing nitrogen oxides and organic chlorine compounds from the combustion waste gas.

Method for removing nitrogen oxides and organic chlorine compounds from

Method for removing organic chlorine compounds from combustion waste gas

A catalyst composition including component A and component B, the component A being a carrier, preferably having a honeycomb structure, and being a single-component oxide or a multi-component composite oxide of at least one metal of titanium, silicon and zirconium, and the component B being a catalyst component deposited on the carrier of component A and being at least one member selected from the group of noble metals and other specifically limited metals and their oxides, is very effective for decomposing and removing poisonous organic chlorine compounds, such as dioxin and the like, or poisonous organic chlorine compound-forming substances contained in an exhaust gas exhausted from an incinerator of an incineration plant provided with the incinerator and a dust collector. In addition, and the generation of the poisonous organic chlorine compound from the incineration plant can be prevented.

Method of treating exhaust gas

An excellent method of decomposing flon is provided which can decompose flon economically with high decomposition efficiency without necessitating high temperature and high pressure by contacting a gas containing a flon with a catalyst at a condition of a temperature of not less than 200.degree. C. and space velocity of not over than 50,000 (hr.sup.-1).

Method of decomposing flow

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Kyoto, Japan

Masakatsu Hiraoka