Tosoh Corporation

Toyota Jidosha Kabushiki Kaisha

Kabushiki Kaisha Toyota Chuo Kenkyusho

Katsumi Kamiyama

Kazushige Igawa

Shinichi Takeshima

Shinichi Matsumoto

Masao Nakano

Koji Yokota

Tadashi Suzuki

Senshi Kasahara

Shiroh Kondoh

Kazunobu Ishibashi

Masayuki Fukui

A catalyst for reducing nitrogen oxides from an exhaust gas containing the same in an oxygen rich atmosphere comprising (i) a zeolite having a molar ratio of SiO.sub.2 /Al.sub.2 O.sub.3 of at least 10, (ii) copper, and (iii) a rare earth ion, an alkaline earth metal and/or a valence variable metal.

Process for reducing nitrogen oxides from exhaust gas

The present invention relates to the production of catalysts and adsorbents which can be used for the removal of nitrogen oxides from exhaust gases containing the same.

Copper-containing zeolites and their preparation

Copper-containing zeolites are prepared by subjecting a zeolite having the lattice spacings (d value) indicated in Table 1 as estimated by powder X-ray diffraction to ion exchange with copper ions in an aqueous solution containing a water soluble copper salt and ammonia. Nitrogen oxides can be decomposed with the copper-containing zeolite catalyst.

Removal of nitric oxides by copper-containing zeolites

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Tokuyama, Japan

Katsumi Kamiyama