Tokyo Gas Company Limited

Shigeo Satokawa

Yuji Kobayashi

Hiroshi Uchida

Ken-ichi Yamaseki

Iruru Takahashi

An adsorbent for removing sulfur compounds from sulfur compounds-containing fuel gas contains a zeolite ion-exchanged with Ag and has an excellent performance when used to remove sulfur compounds from the fuel gas, irrespective of the moisture concentration in the fuel gas, and a method for removing sulfur compounds from sulfur compounds-containing fuel gas by use of an adsorbent of the above-mentioned type. The zeolite is a Na&#x2014;+Y type zeolite.

Adsorbent for removing sulfur compounds from fuel gases and removal method

A method of purifying NOx-containing exhaust gases characterized by using ammonium acetate as a reducing agent with a zeolite-based catalyst. NO.sub.x in NO.sub.x -containing exhaust gases can be removed extremely effectively even at a low concentration thereof by using Fe-treated mordenite as a zeolite-based catalyst according to said method, and since it uses ammonium acetate as a reducing agent, an excellent effect free from ammonia leakage can be obtained. Particularly NO.sub.x in NO.sub.x -containing exhaust gases can be removed effectively at and around a discharge temperature of an exhaust gas from a gas engine in the presence of ammonium acetate as a reducing agent by constituting Fe-containing mordenite as a monolithic material. Hence, it makes it possible to obtain an excellent effect of simplifying the whole denitration system without needing temperature control of an exhaust gas and/or a catalyst bed. In addition, the NO.sub.x -purifying ability of the catalyst does not decrease over a long period of time.

Growing community of inventors

Tokyo, Japan

Shigeo Satokawa