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    23.
    发明专利
    未知

    公开(公告)号：DE956038C

    公开(公告)日：1957-01-10

    申请号：DEB0030419

    申请日：1954-04-01

    Applicant: BASF AG

    Inventor： JOCKERS KURT DR ,  MAIER HERMANN DR ,  WINTERSBERGER KARL DR

    IPC: C01B21/14

    Abstract: In the production of hydroxylamine salts by the reduction of nitric oxide by hydrogen in an acid medium at a catalyst containing platinum metal, at least one of the elements, arsenic, antimony, bismuth, sulphur, selenium, or tellurium are also present. 5-15 per cent gram atoms of the element as a compound may be added to a platinum compound and the two compounds mutually reduced in the preparation of the catalyst. Alternatively, 3-5 per cent gram atoms of the element as a compound, which is reduced under the hydroxylamine production condition, is added to the platinum metal catalyst, preferably in the acid medium, before or during the reaction. Arsenic, antimony, and bismuth are used as trivalent compounds, and sulphur, selenium, and tellurium as di- and/or tetravalent compounds. In examples: (1)-(3) a 1 per cent platinum on graphite catalyst is suspended in sulphuric acid, arsenious, selenious, or tellurous acid, potassium antimonyl tartrate, bismuth nitrate, or sodium sulphide, or mixtures of two of these compounds are added, and hydrogen and nitric oxide are passed in at 45 DEG C. and atmospheric pressure; (4) one of the above compounds is added to the platinum chloride solution, which is reduced by formic acid in the presence of graphite powder in the preparation of the catalyst; (5) a mixed platinum and gold on graphite catalyst is used.

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