Babcock-Hitachi Kabushiki Kaisha

Masatoshi Fujisawa

Yasuyoshi Kato

Eiji Miyamoto

Kouichi Yokoyama

Naomi Imada

Hiroshi Ishizaka

Takashi Michimoto

Yoshinori Nagai

Kazuki Kobayashi

Naomi Yoshida

Takeshi Hirota

Provided is a silver-supported alumina catalyst for reducing nitrogen oxides using ethanol, which has the drawbacks of the conventional silver-supported alumina catalysts improved, has high performance, is not likely to deteriorate over time, and has excellent initial performance and durability. A catalyst for purifying nitrogen oxides, which purifies nitrogen oxides in exhaust gas using an alcohol as a reducing agent, and contains alumina, aluminum sulfate and silver as main components.

Catalyst for cleaning up nitrogen oxides and a method for producing same

A particulate material removing filter for exhaust gas from a diesel engine is provided. The particulate material removing filter is formed by laminating metal laths having an oxidation catalyst layer containing a noble metal that oxidizes nitrogen oxide in exhaust gas into nitrogen dioxide. The metal laths are laminated to form a laminate in such a manner that the drawing direction of the metal lath processing differs by 90 degrees with each other.

Filter for exhaust gas from diesel engine and equipment

The invention is to provide (i) a catalyst which does not require an activation of catalyst components by means of a calcination which has become a hindrance in the way of obtaining a catalyst having a high activity through a conventional technology and in which catalyst the compositing of vanadium with molybdenum is contemplated more than enough; ii) a method for producing the catalyst; (iii) a catalyst having an activity, especially having an activity at low temperatures and a durability both greatly increased; (iv) a catalyst compound for purifying an exhaust gas, in which compound the ratio of vanadium atom to molybdenum atom (V/Mo) is 3/2 or close thereto and which compound is expressed by the rational formula (NH)MoVOwherein x is 2.8 to 3.2; and (v) a method for producing the catalyst compound through a step for reacting molybdenum oxide (MoO) with ammonium metavanadate (NHVO) in the co-presence of water for a prescribed period of time.

Exhaust gas purifying catalyst compound, catalyst comprising said compound and method for preparing the compound

The catalyst structure of the present invention for purifying an exhaust gas is preferable for increasing the contact of an exhaust gas, to be treated, with a catalyst by disturbing the flow of the exhaust gas in a gas flow passage thereby obtain a highly efficient and compact apparatus for treating the exhaust gas. Such catalyst structure is produced by forming two or more catalyst elements each supporting a catalyst component on its surface and having flat plate portions and level-changing portions formed alternately therein with the angle formed between the flat plate portion and the level-changing portion being in a specific range, and then stacking the catalyst elements in a frame. A catalyst structure is also obtained by stacking a large number of the catalyst elements described above through metallic, ceramic, or glass netlike members interposed therebetween and each having a large number of perforated holes. The catalyst structure has such advantages that dust is hardly deposited between the catalyst elements, that a sufficiently high strength can be obtained even when the thickness of catalyst elements is reduced, and that the catalyst structure can be placed in an exhaust gas flue to use as an exhaust gas treating apparatus. When the exhaust gas treating apparatus is employed, an efficient exhaust gas treatment can be effected without damaging the catalyst elements while repressing the pressure loss.

Exhaust emission control catalyst element, catalyst structure, production method thereof, exhaust emission control apparatus and exhaust emission control method using the apparatus

Method for decomposing chlorine-containing organic compound contained in exhaust gas and catalyst for use in the method

Exhaust emission control catalyst structure

Growing community of inventors

Kure, Japan

Masatoshi Fujisawa