Hitachi Maxell, Limited

Masakazu Oshimura

Akira Miyake

Akira Kawakami

Osamu Watanabe

Kenichi Yokoyama

Satoru Yamaguchi

Noboru Odani

Yukihiro Hayashi

Hiroaki Hosoda

Shinichi Fujii

Yoshizo Koori

Osamu Okamoto

Acicular ferromagnetic metal particles having a particle size of 0.1 to 1 .mu.m and a dimension of crystallite-size of not more than about 215 A in the effective thickness of the crystallite in the direction perpendicular to the reflecting plane (110), which have a high coercive force, preferably not less than 1,400 oersteds and are useful for a high-density magnetic recording tape, video mother tape, or permanent magnet material, and a method for the preparation of the ferromagnetic metal particles comprising reducing with heating goethite particles which are prepared by treating a ferrous salt with a large amount of a basic agent, particularly an alkali metal hydroxide.

Acicular ferromagnetic metal particles and method for preparation of the

The reduction of nitrogen oxides involves the passage of gases containing nitrogen oxides at higher than 500.degree. C. over a catalyst comprising cerium oxide and nickel oxide in the CeO.sub.2 /NiO molar ratio of about 0.05 : 1 to 2.5 : 1 and when desired an addition thereto of rhodium in an amount of from about 7.5 to 25 parts by weight per 100 parts by weight of the nickel oxide and cerium oxide composition and when desired an addition to said nickel oxide and cerium oxide composition of ruthenium in an amount of about 10 to 50 parts by weight or an addition to said composition containing rhodium of ruthenium in an amount of about 15 to 50 parts by weight per 100 parts by weight of the nickel oxide and cerium oxide composition. Also, when desired, an addition to said composition of one or more metal sulfides and an addition to said composition of one or more metal oxides is utilized.

Reduction catalysts and processes for reduction of nitrogen oxides

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Ibaraki, Japan

Masakazu Oshimura